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Fisher� 3570 Series Pneumatic ValvePositionersContents

Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Valve Positioner Type Numbers 2. . . . . . . . . . . Specifications 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . Educational Services 4. . . . . . . . . . . . . . . . . . . . . .

Installation, Mounting, and Connections 4. . . . . . . Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic Test Connections (Optional) 5. . . . Connections 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Piping Sizes 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . Vent 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Pressure Connections 7. . . . . . . . . . . . . Cylinder Connections 8. . . . . . . . . . . . . . . . . . . . Instrument Connection 8. . . . . . . . . . . . . . . . . . .

Operating Information 8. . . . . . . . . . . . . . . . . . . . . . Initial Adjustments 8. . . . . . . . . . . . . . . . . . . . . . . . Signal Range Codes 8. . . . . . . . . . . . . . . . . . . . . . Frequency Response 9. . . . . . . . . . . . . . . . . . . . . Adjustment Procedures 11. . . . . . . . . . . . . . . . . . . Changing Positioner Action 13. . . . . . . . . . . . . . . Split Range Operation 15. . . . . . . . . . . . . . . . . . . . Initial Range Spring Extension Procedure

for 3570P and 3570PC Positioners 15. . . . . . Principle of Operation 16. . . . . . . . . . . . . . . . . . . . .

3570, 3570C, 3570P, 3570PC, and3571 Valve Positioners 16. . . . . . . . . . . . . . . . .

3572 and 3576 Valve Positioners 17. . . . . . . . . . 3573 and 3577 Valve Positioners 17. . . . . . . . . . Relay Operation 18. . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting 19. . . . . . . . . . . . . . . . . . . . . . . . . Converting a 3570 Valve Positioner to a

3570C Valve Positioner 20. . . . . . . . . . . . . . . . Range Spring 21. . . . . . . . . . . . . . . . . . . . . . . . . . .

Disassembly 21. . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bias Spring 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disassembly 21. . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Ordering 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts Kits 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Positioner Repair Kits 22. . . . . . . . . . . . . . . . . . . . Diagnostic Test Connection Kits 22. . . . . . . . . . .

W5566*/IL

Figure 1. Fisher� 3570 Positioner Mounted on 470 Actuator

Parts List 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positioner Common Parts 23. . . . . . . . . . . . . . . . .

Introduction

Scope of ManualThis manual provides installation, operation,adjustment, maintenance, and parts orderinginformation for Fisher� 3570 Series pneumatic valvepositioners. The various product types within thisseries are described later in this manual. Refer tofigure 1 for a typical mounting of a 3570 positioner.Refer to separate instruction manuals for informationconcerning the actuator, valve, and accessories.

Instruction ManualD200137X012October 2008 3570 Positioners

3570 PositionersInstruction Manual

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Do not install, operate or maintain a 3570 Seriespositioner without first � being fully trained andqualified in valve, actuator and accessoryinstallation, operation and maintenance, and �carefully reading and understanding the contents ofthis manual. If you have any questions about theseinstructions, contact your Emerson ProcessManagement sales office.

Description The 3570 Series pneumatic valve positioners areused with control valve assemblies to provide anaccurate valve stem position that is proportional tothe input signal received from a control device. Theinput signal range can be 0.2 to 1.0 bar (3 to 15psig), 0.4 to 2.0 bar (6 to 30 psig), or anotherpneumatic input signal range, as required.

These positioners are normally used with pneumaticpiston actuators. However, product types within the3570 Series can be used with pneumatic, long-stroke,cylinder actuators or with pneumatic diaphragmactuators.

Valve Positioner Type Numbers3570 — Pneumatic valve positioner with two relaysfor use with Fisher 470 and 480 Series pneumaticpiston actuators. See figure 2. The positionerincludes three pressure gauges to monitor inputsignal, relay output pressure to the top of theactuator cylinder, and relay output pressure to thebottom (piston underside) of the actuator cylinder.

The 3570 positioner is mounted on the top of theactuator cylinder. The actuator stem positionfeedback is provided through extension of the rangespring attached to the actuator piston rod.

3570C — Pneumatic valve positioner withautomotive tire valves instead of pressure gauges.Tire valves can be used for clip-on test pressuregauges. The relay nozzles are locked in place withlocknuts to resist unwanted nozzle movement due tovibration.

3570P — Pneumatic valve positioner with two relaysfor use with Fisher 490 Series pneumatic pistonactuators. The positioner includes three pressuregauges to monitor input signal, relay output pressureto the top of the actuator cylinder, and relay outputpressure to the bottom (piston underside) of theactuator cylinder.

The 3570P positioner is mounted alongside theactuator cylinder. Actuator stem position feedback isprovided from the actuator-valve stem connectorthrough a cable and spool assembly.

3570PC — Pneumatic valve positioner withautomotive tire valves instead of pressure gauges.Tire valves can be used for clip-on test pressuregauges. The relay nozzles are locked in place withlocknuts to resist unwanted nozzle movement due tovibration.

3571 (Discontinued)— Pneumatic valve positionerwith two relays for use with long-stroke cylinderactuators. The positioner includes three pressuregauges to monitor input signal, relay output pressureto the top of the actuator cylinder, and relay outputpressure to the bottom (piston underside) of theactuator cylinder.

The 3571 positioner is bracket-mounted to the sideof the actuator. Actuator stem position feedback isprovided through a wire from the actuator-valve stemconnector.

3572 — Pneumatic valve positioner with one relay.The 3572 positioner is normally used on the 472pneumatic piston actuator mounted on valve bodieshaving push-down-to-open (PDTO) action. Thepositioner includes two pressure gauges to monitorinput signal pressure and relay output pressure tothe top of the actuator cylinder.

The 3572 positioner is mounted on the top of theactuator cylinder. Actuator stem position feedback isprovided through an extension of the actuator pistonrod.

3573 — Pneumatic valve positioner that is similar toThe 3572 positioner with the relay output pressurepiped to the bottom (piston underside) of the actuatorcylinder. The 3573 positioner is normally used on the473 pneumatic piston actuator with valve bodieshaving push-down-to-close (PDTC) action.


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Table 1. Specifications

Available ConfigurationsSee the positioner type number descriptions givenabove.

Input SignalStandard Ranges: 0.2 to 1.0 bar (3 to 15 psig) or0.4 to 2.0 bar (6 to 30 psig)Optional Ranges: As desired, within the limits ofthe bellowsSplit Ranges: Use one-half of either standardrange when two control valves are operated byone output signal form a single control device

Output SignalType: Pneumatic pressure as required tomaintain the correct valve stem position and seatloadAction: Field-reversible between direct andreverse

Resolution(1)

0.2% of instrument pressure span

Repeatability(1)

0.3% of total stroke or instrument pressure span

Frequency Response(1)

See figure 5

Pressure ConnectionsVent: 3/8 NPTAll others: 1/4 NPT

Pressure Indications3570C and 3570CP Positioners: Tire valvesaccept standard pressure gauge chucks (gaugesnot supplied)All Other Types: Gauges supplied per table 3

Bellows Pressure RatingStandard Bellows: 3.4 bar (50 psig)Optional Bellows: 6.2 bar (90 psig)

Supply PressureMaximum: 10.4 bar (150 psig)Minimum: 2.4 bar (35 psig)

Supply MediumAir or Natural gas(2)

Steady-State Air Consumption(3)

0.54 normal m3/h (20 scfh) with 6.9 bar (100 psig)supply pressure

Operative Ambient Temperature Limits(1)

With Nitrile O-Rings and Diaphragms: –34 to71°C (–30 to 160°F)With Fluorocarbon O-Rings and Diaphragms(Optional): 0 to 104°C (32 to 220°F)

Hazardous Area ClassificationComplies with the requirements of ATEX Group IICategory 2 Gas and Dust

Options� Restrictor (high-frequency filter for bellows)

Approximate Weight2.7 kg (6 pounds) without optional mountingbracket or actuator/valve assembly

Declaration of SEPFisher Controls International LLC declares thisproduct to be in compliance with Article 3paragraph 3 of the Pressure Equipment Directive(PED) 97 / 23 / EC. It was designed andmanufactured in accordance with SoundEngineering Practice (SEP) and cannot bear theCE marking related to PED compliance.However, the product may bear the CE markingto indicate compliance with other applicableEuropean Community Directives.

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 − Process Instrument Terminology.1. For a 3570 or 3570C positioner mounted on a 470 or 480 actuator. Values do not apply to other constructions or actuator-valve combinations.2. Natural gas should not contain more than 20 ppm of H2S.3. m3/h at 0°C, 1.01325 bar, absolute (Scfh at 60°F, 14.7 psia).

Table 2. Action Under Normal Operating Conditions

POSITIONERACTION

DESIRED PISTON MOTION(1)

Down Up

Direct-acting Increasing input signalpressure to bellows

Decreasing input signalpressure to bellows

Reverse-acting Decreasing input signalpressure to bellows

Increasing input signalpressure to bellows

1. Supply pressure is routed through relays to piston.


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Table 3. Pressure Indications

PRESSUREMONITORED

NUMBER OFGAUGES

SUPPLIED STANDARD GAUGERANGE(1)

Two-RelayPositioner

One-RelayPositioner

Positionerinput signalpressure

1 1 0-30 psi/0-0.2 MPa/0-2 bar or0-60 psi/0-0.4 MPa/0-4 bar

Cylinder(relay output)pressure

2 1 0-160 psi/0-1.1 MPa/0-11 bar

1. For gauges marked in other units and ranges, consult your Emerson ProcessManagement sales office.

3576 (Discontinued)— Pneumatic valve positionerwith one relay for use on direct-acting pneumaticdiaphragm actuators that require high operatingpressures. The 3576 positioner includes two pressuregauges to monitor input signal pressure and relayoutput pressure to the top of the actuator diaphragm.

The 3576 positioner is bracket-mounted to theactuator yoke. Actuator stem position feedback isprovided through a wire from the actuator-valve stemconnector.

3577 (Discontinued)— Pneumatic valve positionerthat is similar to 3576 positioner with the relay outputpressure piped to the underside of the actuatordiaphragm on reverse-acting pneumatic diaphragmactuators.

Specifications

Specifications for the 3570 Series positioners arelisted in table 1.

Educational Services

For information on available courses for 3570 Seriespositioners, as well as a variety of other products,contact:

Emerson Process ManagementEducational Services, RegistrationP.O. Box 190; 301 S. 1st Ave.Marshalltown, IA 50158−2823Phone: 800−338−8158 orPhone: 641−754−3771 FAX: 641−754−3431e-mail: [email protected]

Installation, Mounting, andConnections

Installation

WARNING

� Always wear protective clothing,gloves, and eyewear when performingany installation operations to avoidpersonal injury.

� Personal injury or propertydamage may result from fire orexplosion if natural gas is used as thesupply medium and preventativemeasures are not taken. Preventativemeasures may include: Remoteventing of the unit, re-evaluating thehazardous area classification,ensuring adequate ventilation, and theremoval of any ignition sources. Forinformation on remote venting of thispositioner, refer to page 6.

� Check with your process or safetyengineer for any additional measuresthat must be taken to protect againstprocess media.

� If installing this into an existingapplication, also refer to the WARNINGat the beginning of the Maintenancesection of this instruction manual.

The positioner is usually mounted on the actuator atthe factory. However, if the positioner and actuatorare ordered separately, it is necessary to mount thepositioner on the actuator. Before mounting thepositioner, be certain the O-ring (key 33, figure 11) isin place in the cylinder (top connection) in the baseof the positioner.

For appropriate actuator/positioner combinations,refer to the positioner type number descriptionsgiven earlier in this instruction manual.

� For 3570, 3570C, 3572, and 3573positioners, mount the positioner with two capscrews (key 32, figure 11). If the range and biassprings are not installed in the positioner, refer to therange spring and bias spring procedures in theMaintenance section.


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CYLINDERBOTTOMPRESSURE

W4025*/IL W4027*/IL

CLEAN-OUTPLUNGER

HORIZONTALRELAY

CYLINDER(TOP CONNECTION)(O-RING, KEY 33)

CYLINDERTOP PRESSUREZERO ADJUSTMENT

INSTRUMENTPRESSURE

VENT CONNECTION3/8 NPT

NOTES:ON SOME CONSTRUCTIONS, TWO NOZZLES AND ADJUSTMENTS ARE REQUIRED.

CYLINDER(BOTTOM CONNECTION)(1/4 NPT)

INSTRUMENTCONNECTION(INPUT SIGNAL)(1/4 NPT)

SUPPLYCONNECTION(NOT SHOWN)(1/4 NPT)

VERTICALRELAY

BELLOWS

RELAY NOZZLE(OUTPUT PRESSURE

ADJUSTMENT)

BELLOWSPOSTS

FRONT VIEWBACK VIEW

1

1

RANGE SPRING(SPAN ADJUSTMENT)

Figure 2. Typical Location of Fisher� 3570 Positioner Parts and Adjustments

Insert the threaded end of the spring retainer (key19, figure 3) into the center of the range spring (seefigure 3). Then, insert a screwdriver into the centerof the range spring and extend the spring until thespring retainer can be screwed into the top of theactuator piston rod extension. Tighten the springretainer into the top of the actuator piston rodextension. If the range spring and/or bias spring isnot installed in the positioner, refer to the proceduresfor either spring in the Maintenance section.

� For 3570P and 3570PC positioners, attachthe positioner extension and positioner to thecylinder mounting plate with the two cap screws (key100, figure 14). Make the required pressureconnections as described in the following procedure.Go to the initial range spring extension proceduresfor 3570P and 3570PC positioners.

� For 3571, 3576, and 3577 positioners, inserttwo cap screws through the holes in the mountingbracket (key 55, figure 13) to attach the positioner tothe actuator mounting boss. Attach the hex drivestud to the actuator-valve stem connection. Attachthe end bearing (key 56E, figure 13) to the hex drivestud.

Diagnostic Test Connectors (Optional)

Diagnostic test connectors are available from thefactory, when the unit is ordered, or they can beinstalled on an existing control valve assembly in thefield. These connectors are especially useful for‘‘quick’’ connections when using the FlowScanner�valve diagnostic system. The FlowScanner is aportable, microprocessor-based diagnostic andcalibration system specifically designed for use withpneumatically-operated control valves.

To support diagnostic testing of the control valveassembly, the connectors, piping, and otherhardware can be installed between the 3570 Seriespositioner and the actuator. A typical connectorinstallation is shown in figure 4. For connectors, referto the FlowScanner Diagnostic Connection kit listingin the parts list.

The hardware used includes 3/4 NPT pipe nipple,pipe tee, and pipe bushings with a 1/8 NPT pipebushing for the connector. The connector consists of1/8 NPT body and body protector (see figure 4).


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AJ7270-C1H8907-C1J2233-CB2402/IL

ZEROADJUSTMENT

EFFECTIVELENGTH

EFFECTIVELENGTH

OVERALLLENGTH

SPRING LOCK BELLOWS

BEAMTRAVELSTOP(E-RING)

BEAM

SPRINGRETAINERSPACER

SPRINGRETAINER SPACER(IF REQUIRED)(KEY 235)

SPRINGRETAINER(KEY 19)

RANGE SPRING(KEY 18)

(OPTIONAL)

PISTON RODEXTENSION

LOCKNUTS

SPRINGRETAINER

BIASSPRING

BIAS SPRINGPOST

NOTE:BOTTOM OF BIAS SPRING POST THREAD MUST BE POSITIONED

AS SHOWN FOR PROPER POSITION OF E-RING TRAVEL STOPS.

Figure 3. Bias and Range Springs for Zero and SpanAdjustments

1. Before assembling the pipe nipple, pipe tee, pipebushings, actuator piping, and connector body, applysealant to all threads.

2. Position the pipe tee, connector body, and bodyprotector for easy access when doing diagnostictesting.

Connections

Piping SizesAll pressure connections on the 3570 Seriespositioners are 1/4 NPT (internal). Use 3/8-inch pipeor tubing for supply, cylinder (bottom connection),and instrument (input signal) connections. For theremote vent pipe, if one is required, use 19 mm(3/4-inch) (minimum inside diameter) pipe for runsup to 6.09 meters (20 feet). For vent piping runsfrom 6.09 to 30.5 meters (20 to 100 feet), use 25.4mm (1-inch) (minimum inside diameter) pipe. Referto figure 2 for the locations and sizes of connections.

12B8044-AA6112/IL

PIPE NIPPLETO BOTTOMCYLINDER

PIPE TEE

GAUGE

ACTUATOR

FISHER377 SERIESTRIP VALVE(OPTIONAL)

PIPE NIPPLE TO INSTRUMENT CONNECTION

PIPE NIPPLE TO SUPPLYCONNECTION

3570 SERIES POSITIONER

BODY PROTECTOR

BODY

PIPE BUSHING

STEMREQUIRED WHENPURCHASED WITH GAUGE

FROM 377 SERIESTRIP VALVE

Figure 4. Diagnostic Test Connections

Vent

WARNING

Personal injury or property damagecould result from fire or explosion ofaccumulated gas, or from contact withhazardous gas, if a flammable orhazardous gas is used as the supplypressure medium.The positioner/actuator assembly doesnot form a gas-tight seal, andflammable or hazardous gas couldleak from the assembly. Therefore, ifthe assembly is enclosed install aremote vent line from the enclosure.However, a remote vent pipe alonecannot be relied upon to remove allhazardous gas. Use adequateventilation, and necessary safetymeasures. Vent line piping shouldcomply with local and regional codesand should be as short as possiblewith adequate inside diameter and fewbends to reduce case pressurebuildup.

CAUTION

When installing a remote vent pipe,take care not to overtighten the pipe in


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the vent connection. Excessive torquewill damage the threads in theconnection.

Note

The vent connection is always pluggedwith a pipe plug for 3570P and 3570PCpositioners when mounted on 490Series actuators.

The connection marked VENT (see figure 2) shouldbe left open if the actuator is installed in the verticalposition. However, the vent must be protectedagainst the entrance of any foreign material thatcould plug it. Check the vent periodically to becertain it is not plugged.

If the actuator is mounted in other than the verticalposition, be sure there is a vent and drain at thelowest point of the positioner. To do this, remove thepipe plug (key 36, figure 11) from the cover. Then,position the cover in such a way that the hole in thecover is at the lowest point. Plug the vent connectionbecause the positioner is now vented through thecover.

Note

A remote vent is not possible with3570P, 3570PC, 3571, 3576, and 3577positioners.

If a remote vent is required, the vent line must be asshort as possible with a minimum number of bendsor elbows. Vent line piping should have a minimuminside diameter of 19 mm (3/4-inch) for runs up to6.09 meters (20 feet) and a minimum insidediameter of 25.4 mm (1-inch) for runs from 6.09 to30.5 meters (20 to 100 feet).

Supply Pressure Connections

WARNING

Personal injury or property damagemay occur from an uncontrolledprocess if the supply medium is notclean, dry, oil-free air, or noncorrosivegas. While use and regularmaintenance of a filter that removesparticles larger than 40 microns indiameter will suffice in mostapplications, check with an Emersonfield office and industry instrument air

quality standards for use withcorrosive air or if you are unsure aboutthe proper amount or method of airfiltration or filter maintenance.

WARNING

To avoid personal injury or propertydamage resulting from the suddenrelease of pressure, do not install thevalve assembly where serviceconditions could exceed the limitsgiven in this manual or on theappropriate nameplates. Usepressure-relieving devices as requiredby government or accepted industrycodes and good engineering practices.

WARNING

If the supply pressure medium iscorrosive, make sure the tubing andinstrument components that contactthe corrosive medium are of suitablecorrosion-resistant material. The useof unsuitable materials might result inpersonal injury or property damagedue to the uncontrolled release of thecorrosive media.

The connection marked SUPPLY (see figure 2) mustbe provided with clean, dry air or a noncorrosivegas. Install a 40-micron filter and suitable equipmentto dry the supply medium. Establish a maintenancecycle to ensure that the regulator and filter areworking correctly.

CAUTION

The maximum allowable supplypressure to prevent damage to thecomponents of the positioner,actuator, and valve is normallystamped on the actuator nameplate.Use a suitable supply pressureregulator to reduce the supplypressure source to the value stampedon the nameplate.

If this maximum supply pressure value is notavailable, use a supply pressure that does notexceed any of the following:

� The maximum supply pressure for thepositioner as shown in table 1.


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� The maximum pressure rating of the actuator,from the appropriate actuator instruction manual.

� The maximum allowable valve plug stem loadfor the specific valve body assembly being used.Contact your Emerson Process Management salesoffice for valve plug stem load information, ifrequired.

� For diaphragm actuators, refer to the actuatorinstruction manual for the recommended supplypressure and use the larger value of the range listed.

The recommended supply pressure for use withpiston actuators is the highest available supplypressure between 3.4 bar (50 psig) and themaximum limit determined by the actuator andpositioner specifications. Selecting the highestpressure within the limits will minimize load error andwill maximize stroking speed and thrust. For the lowestsupply pressure that will assure satisfactoryperformance, the factors of valve plug unbalanceforce, valve plug seating force, and frictional forcemust be considered in the following relationship:

Supplypressure, = 98bar

(Valveunbalance,

kg)+ +

(Seatingforce,

kg)

(Frictionalforce,

kg) + 0.7 bar

(Area of the actuator piston,in square mm)

[ ]

or

Supplypressure, =psig

(Valveunbalance,

pounds)+ +

(Seatingforce,

pounds)

(Frictionalforce,

pounds) + 10 psig

(Area of the actuator piston,in square inches)

[ ]

Consult your Emerson Process Management salesoffice for the appropriate values for specificactuators, valves, and service conditions. The 0.7bar (10 psig) is added to the equation to account foran approximate 0.7 bar (10 psi) differential pressureloss in the positioner. For spring-return pistonactuators, the pressure required to compress theactuator spring completely must also be considered.

Cylinder Connections1. The connection marked CYLINDER (see figure 2)is connected at the factory to the lower part of thecylinder (bottom) or to the lower diaphragm casing ifthe positioner is used with a pneumatic diaphragmactuator.

2. The cylinder top connection is a pressurepassage located in the bottom of the positioner base(key 1, figure 11). On 3570 and 3570C positioners,an O-ring (key 33, figure 11) is used between thebottom of the positioner and the top of the actuator.On 3570P, 3570PC, 3571, 3576, and 3577positioners, a mounting bracket (key 55, figure 13) isrequired. This mounting bracket connects to thebottom of the base. An O-ring (key 33, figure 11) isplaced between the base and mounting bracket.This mounting bracket provides a 1/4 NPTconnection for the positioner output. This connectionis made at the factory if the positioner is orderedmounted to the actuator or if the mounting bracket isinstalled.

Instrument ConnectionThe connection marked INSTRUMENT (see figure2) connects to the output signal connection of thecontrol device. The positioner operates only on apneumatic input signal; the input signal range ismarked on the nameplate (key 23, figure 11). Themaximum allowable input signal for positioners withstandard or optional bellows is in table 1 (bellowspressure rating). The instrument connection is madeat the factory when a complete control valveassembly with a valve-mounted control device isordered. Otherwise, make field connections to thepositioner from an appropriate control device. Referto table 1 and the nameplate for input signalpressure ranges.

Operating Information

Initial AdjustmentsNormally, no adjustments are necessary upon initialinstallation. The positioner is set at the factory for thetravel, input signal range, and action specified in theorder. Adjustment is necessary when operatingconditions are changed, when the unit has beendismantled and reassembled, or when the controlvalve travel does not correspond to the desired inputsignal range. If the operating conditions have notchanged but the positioner requires adjustment,refer to the adjustment procedures in this section. Ifthe operating conditions have changed, first, refer tothe signal range code descriptions, then, refer to theadjustment procedures.

Signal Range CodesThe range spring and the bias spring are matched toa specific input signal range and length of travel.


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Also, the spring retainer length is matched to theapplication on the 3570, 3570C, 3572, and 3573positioners. Refer to figure 3 for location of parts.

The signal range codes in table 4 are based on thefollowing applications:

� Codes for valve travels up to and including50 mm (2 inches) are used for actuators that have a50 mm (2 inch) maximum travel. If the actuatormaximum travel is greater than 50 mm (2 inches), anadditional retainer spacer (key 235, see figure 3) isrequired. Refer to the parts list for the additionalspring retainer spacer (key 235) part number.

� Codes for valve travels greater than 50 mm(2 inches), up to and including 105 mm (4-1/8inches), are used for actuators that have a 105 mm(4-1/8 inch) maximum travel, except the 480-12 or480-15 Size 20 actuators which have a 54 mm(2-1/8 inch) maximum travel. If the actuatormaximum travel is greater than 105 mm (4-1/8inches), an additional retainer spacer are required.Refer to the parts list for the additional springretainer spacer (key 235) part numbers.

� Codes for valve travels greater than 105 mm(4-1/8 inches), up to and including 206 mm (8-1/8inches), are for actuators that have a 206 mm (8-1/8inch) maximum travel. If the valve travel is 105 mm(4-1/8 inches) or less, two additional spring retainerspacers are required. Refer to the parts list for theadditional spring retainer spacer (key 235) partnumbers.

If the input signal range and travel do not match anyof the selections in table 4, consult your EmersonProcess Management sales office for information. Tochange the springs, refer to the range and biasspring procedures in the Maintenance section.

From table 4, select the signal range that matchesyour application. Find the travel length for theapplication under the signal range selected, then usethe code (from the direct or reverse column) thatmatches the direct or reverse operation of thepositioner.

The first number in the code is used to identify therange spring, the letter in the code is used to identifythe bias spring, and the second number (after theletter) is used to identify the spring retainer. Forexample, from table 4, for a signal range of 0 to 1.0bar (0 to 15 psig), an actuator travel of 14.3 mm(9/16-inch), and direct action, the signal range codefrom table 4 is 6G3. The ‘‘6’’ indicates the range

spring. The ‘‘G’’ indicates the bias spring. The ‘‘3’’indicates the spring retainer.

Note

It is necessary to add the bias springseat (key 8) to a unit when changingfrom an extension type spring (key 9)to a compression type spring (key 48).

When planning to change the bias spring in anexisting unit, inspect the unit first to determine if thecurrent bias spring is an extension type spring (key9) or a compression type spring (key 48). To changefrom an extension type spring to a compression typespring, it is necessary to add the bias spring seat(key 8). Refer to the appropriate procedures in theMaintenance section of this manual.

In some cases, it is necessary to add an additionalspring retainer spacer or change from the standardbellows to the optional high pressure bellows. Table4 footnotes indicate the use of an additional springretainer spacer or high pressure bellows.

Use the code from table 4 while referring to tables 5,6, and 7 to determine the part numbers for the rangespring, bias spring, and spring retainer. Unlessotherwise specified, use the standard bellows. Also,no spring retainer spacer is required unless thespacer is specified in the footnotes of table 4.

Frequency Response

Figure 5 shows how a 3570 or 3570C positioner with470 or 480 actuator responds when the input signalpressure is cycled at a small amplitude (3 to 5percent), and at an increasing frequency. Assumethe cycling input signal and the movement of theactuator rod are represented by sine waves. As theactuator rod is forced to move faster, its motionbegins to fall behind the input signal in both time(shown as phase lag) and amplitude (shown asnormalized gain).


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Table 4. Fisher� 3570 Signal Range Codes(1)

SIGNAL RANGE0 to 1.0 bar (0 to 15 psig)

SIGNAL RANGE0.2 to 0.6 bar (3 to 9 psig)



Travel Code Travel Code Travel Code Travel Codemm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse

14.317.519

20.626.2

9/1611/163/4

13/161-1/32

6G32G47A17G15A12

6D32G47C17B1

5D12

66.776.279.482.685.7

2-5/83

3-1/83-1/43-3/8

15G1314G814G814G814G8

15A1314A814A814A814A8

5454

2-1/8(3)

2-1/8(8)4G14G8

4B14B8 190.5

193196.6198.9203.2206.4

7-1/27.6

7-3/47-13/16

88-1/8

19G519G819G319G819G819G12

19C519C819B319B819B8

19B13

55.657.158.759.560.3

2-3/162-1/4

2-5/16(3)

2-11/322-3/8

9G39G39G29G39G3

9B39B39B29B39B3

28.630.238.139.744.5

1-1/81-3/161-1/2

1-9/161-3/4

5C812A138G58G128G5

5C812C13

8B58B128A5

88.996.8

101.6104.8117.5

3-1/23-13/16

44-1/8

4-5/8(2)

14G814G814G813G813G3

14A814A814A813A813A3


63.566.768.369.973

2-1/22-5/8

2-11/162-3/42-7/8

9G39B3

9G109G109G5

9B39B39B109B109B5

9.511.115.919

22.2

3/87/165/83/47/8

10A210A23A211A411A5

10D210D23D211D411D5

50.879.4

101.6104.8127

23-1/8

44-1/8

5

8G59A3

9A129G121B8

8A59B39B129B1

21D8

127152.4165.1177.8203.2206.4

5(3)

66-1/2

78

8-1/8

13G413G313G313G818G818G8

13A413A313A313A818A818A8

74.676.278.579.482.6

2-15/163

3.093-1/83-1/4

9G59G129G89G7

9G10

9B59A129B89B79B10

25.428.631.833.338.1

11-1/81-1/4

1-5/161-1/2

2C52A55G42A122C10

2C52D55D4

2D122C10

SIGNAL RANGE0 to 2.0 bar (0 to 30 psig) SIGNAL RANGE

0.2 to 1.0 bar (3 to 15 psig)15.919

25.428.633.3

5/83/41

1-1/81-5/16

10D210D311A411A5

11A12

10D210D311D411D5

11D12

84.985.786.588.992

3-11/323-3/8

3-13/323-1/23-5/8

9G89G139G109G139G13

9B89B139B109B139B13

3.23.24

6.48.79.5

1/81/8(6)

5/321/4

11/323/8

17H410D310D210B46A36A3

17H410D310H210H46C36C3

43.947.650.85454

63.5

1.731-7/8

22-1/8

2-1/8(8)

2-1/2

2G122G105G1012A3

12G131A3

2D122C105D1012D312D13

1D338.150.85454

76.279.4

1-1/22

2-1/8(2)

2-1/8(8)

33-1/8(2)

11D122G512G7

12G1012C312A8

11D122D5

12D712D1012C312D8

92.995.396.8100

101.6

3-21/323-3/4

3-13/163-15/16

4

9G89G89G8

21G821G8

9B89B89C821B821A8

11.111.912.714.815.9

7/160.469

1/20.582

5/8

6A46A47G15G47G3

6D46D47C15C47B3

76.279.482.688.9

101.6

33-1/83-1/43-1/2

4

1B121A124G14G44G1

1D121D124C14D44B1101.6

104.8108

111.1114.3

4(6)

4-1/84-1/4(4)

4-3/8(2)

4-1/2(6)

14G116G816G1316G120A8

14A116B8

16D1316C120C8

101.6104.8

44-1/8

1G11G1

1D11C1

17.519

20.622.223.8

11/163/4

13/167/8

15/16

7G47G47A55G58G5

7B47C47B55C58B5

104.8114.3127

133.4152.4

4-1/84-1/2(7)

5(6)

5-1/4(6)

6(5)

4G521A1321A421A316G3

4D521D1321D421D316C3


11.112.715.919

22.2

7/161/25/83/47/8

5G58G58G108G138G8

5A58A58A108A138B8

116.8117.5120.7127

133.4

4.6(4)

4-5/8(2)

4-3/4(2)

5(5)

5-1/4(5)

16G416G316G314G116G10

16C416B316B314C116C10

25.427

28.631.833.3

11-1/161-1/81-1/4

1-5/16

8G58G128G128G128G10

8B58B128B128B128C10

190.5203.2

7-1/2(2)

8(4)21G121G10

21D121D10


25.427

28.635

38.1

11-1/161-1/81-3/81-1/2

4G84G89G89G89G8

4B84B89A89A89A8

139.7152.4155.6165.1169.9

5-1/2(5)

6(5)

6-1/8(5)

6-1/2(5)

6-11/16

14G113G313G313G320G3

14B113A313A313A320B3

1928.638.150.85454

3/41-1/81-1/2

22-1/8

2-1/8(8)

5G58G128G84G89G3

9G12

5C58B128B84B89C39B12

3536.538.139.741.3

1-3/81-7/161-1/2

1-9/161-5/8

8G108G138G138G88G8

8B108B138B138C88B8

41.350.85454

58.763.5

1-5/82

2-1/82-1/8(8)

2-5/162-1/2

9G815G815A115G515G115G3

9A815A815A115A515A115A3

171.5173

177.8181.8188.1

6-3/4(5)

6-13/167

7-5/32(2,6)

7-13/32

13G520G320G513G120G3

13A520A320C513A120B3

44.546

47.650.8

1-3/41-13/16

1-7/82

8G84G84G74G8

8B84C84B74B8

76.2101.6104.8152.4

34

4-1/86(4)

9G521G816G813G1

9C521B816B813B1

−Continued−


October 2008

11

Table 4. Fisher� 3570 Signal Range Codes(1) (Continued)SIGNAL RANGE

0.4 to 1.2 bar (6 to 18 psig)SIGNAL RANGE



0.6 to 1.0 bar (9 to 15 psig)Travel Code Travel Code Travel Code Travel Code

mm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse

165.1206.4

6-1/2(5)

8-1/813G319G5

13A319C5

57.1 2-1/4 12G1 12D18.711.112.715.917.5

11/327/161/25/8

11/16

5A135G5

12G138G88G8

5D135B5

12B138B88C8

104.8117.5

4-1/84-5/8

14G813G3

14B813B8

58.460.3

2.32-3/8

12G312A10

12C312D10

SIGNAL RANGE0.4 to 2.0 bar (6 to 30 psig) 127

152.4155.6165.1177.8

5(3)

66-1/86-1/2

7

13G1213G313G413G1213G3

13B1213B313B4

13B1213B3

63.566.769.976.279.4

2-1/22-5/82-3/4

33-1/8

1G31G31G41G14G1

1H31D31D41D14C1

6.49.511.112.715.9

1/43/8(6)

7/161/25/8

17H410A410A210A23G2

17H410H410H210D23H2

1925.428.638.141.3

3/41

1-1/81-1/21-5/8

8G104F89G89F89F8

8B104B89B89B89B8

203.2206.4

88-1/8

18G818G8

18B818B8

82.684.185.788.990.5

3-1/43-5/163-3/83-1/2

3-9/16

4G14G34G1

1G124G1

4C14D34H1

1D124D1

1922.225.426.228.6

3/47/81

1-1/321-1/8

11G411A52G42G42G5

11H411H52D42H42D5


50.85454

58.763.573

22-1/8

2-1/8(8)

2-5/162-1/22-7/8

15G815G115F515G115F114G8

15B815B115B515C115A114B8

1928.638.150.876.2

3/41-1/81-1/2

23

5G105G88F54F89G8

5D105D88C54D89H8

92.995.3

101.6104.8127

3-21/323-3/4

44-1/85(6)

4G14G14G4

4G1221A5

4D14D14D4

4D1221H5

31.835

38.139.741.3

1-1/41-3/81-1/2

1-9/161-5/8

2G52G125G55G55G5

2D52D125D55D55D5

76.279.482.687.388.9

33-1/83-1/43-7/163-1/2

14G814G814G814G814G8

14B814B814B814B814B8

79.482.6

101.6104.8127

3-1/83-1/44(6)

4-1/85(5)

9F89F8

14E816F814F1

9C89C8

14D816D814D1

133.4142.9152.4165.1177.8

5-1/4(6)

5-5/8(6)

6(5)

6-1/2(2)

7(4)

21A1316G116G316G121G12

21D1316D116C316C121D12

4648.350.85454

1-13/161.92

2-1/8(3)

2-1/8(8)

5G512G1312C812G7

12G13

5D512H1312C812D712D13

90.596.8

101.6

3-9/163-13/16

4

20F814G814G8

20A814B814A8

133.4165

206.4

5-1/4(3)

6-1/2(5)

8-1/8(5)

19F313F318F1

19D313B318D1203.2 8(4) 21E12 21D12

1. For 3570P signal range codes, contact your Emerson Process Management sales office.2. Use spring retainer spacer 1J803846172; for additional information, see table 7.3. Use spring retainer spacer 1J223346172; for additional information, see table 7.4. Use spring retainer spacer 1J803946172; for additional information, see table 7.5. Use with high pressure bellows and spring retainer spacer 1J803946172; for additional information, see table 7.6. Use with high pressure bellows.7. Use with high pressure bellows and spring retainer spacer 1J223346172; for additional information, see table 7.8. For use with 480-12 or 480-15 size 20 actuators.

2K5255-RA1285-2/IL

1. SIZE 30—19 mm (3/4 INCH) TRAVEL 4. SIZE 80—51 mm (2 INCH) TRAVEL2. SIZE 40—38 mm (1-1/2 INCH) TRAVEL 5. SIZE 100—51 mm (2 INCH) TRAVEL3. SIZE 60—38 mm (1-1/2 INCH) TRAVEL 6. SIZE 130—76 mm (3 INCH) TRAVEL

Figure 5. Typical Frequency Response for a Fisher� 3570 or3570C Positioner Mounted on a 470 or 480 Actuator

Adjustment ProceduresRefer to figure 3. The 3570 Series positioners havethree adjustments:

� The bias spring. It is the zero adjustmentwhich determines the starting point of the valve plugtravel.

� The range spring. It is the span adjustmentwhich determines the full valve plug travel for agiven input signal range.

� The relay nozzle adjustment. This adjustmentdetermines the steady-state positioner outputpressure.

To illustrate the use of the various adjustments,assume that the positioner has been repaired or hasbecome completely out of adjustment. Assume also


October 2008

12

that the input signal range is 0.2 to 1 bar (3 to 15psig). Proceed as follows:

1. Make sure the input signal range and the valvetravel stamped on the nameplate agree with thepresent operating conditions.

2. Loosen the four thumb screws on the undersideof the positioner base and remove the cover.

3. Provide a means for varying the input signalpressure from zero to 0.07 or 0.14 bar (1 or 2 psig)above the higher value of the input signal range (seetable 1). Provide an accurate means of measuringthe input signal pressure. Check the accuracy of thepositioner instrument pressure gauge (see figure 2).The gauge accuracy is ±0.04 bar (±0.6 psig) on a 0to 2 bar (0 to 30 psig) gauge, and ±0.08 bar (±1.2psig) on a 0 to 2 bar (0 to 60 psig) gauge. Thisaccuracy is measured at the mid-point of the fullrange of the scale.

4. Set the input signal pressure at the mid-point ofits range [0.6 bar (9 psig) in this example]. Observethe valve travel indicator scale attached to the yoke.The indicator disk should be somewhere betweenthe open and closed positions.

5. Loosen the locknut directly below the bias springseat (see figure 3) and adjust the bias spring up ordown until the valve travel indicator disk shows thatthe valve plug is somewhere between the open andclosed positions. Upward movement of the biasspring adjustment causes downward travel of thevalve stem.

6. For positioners with two relays (3570, 3570C,3570P, 3570PC, and 3571 positioners), observe therelay output pressures. If the cylinder gauges arepresent as shown in figure 2, read the cylinder topand cylinder bottom gauges or use clip-on testpressure gauges. The two relay output pressuresshould be approximately equal [within 0.3 bar (5psig)] and should be approximately 75 percent of thesupply pressure. For example, if the supply pressureis 7 bar (100 psig), the two relay output pressuresshould be within 0.3 bar (5 psig) of each other, andshould be approximately 5.2 bar (75 psig).

CAUTION

The relays in the 3570C and 3570PCpositioners use a locknut (key 29P,figure 11) on the nozzle (key 29Q). If thenozzle is rotated when the locknut istight, damage to the relay diaphragmmight result. Always use a wrench onthe nozzle to prevent it from turning

while loosening or tightening thelocknut.

If the relay output pressures are not at the valuesmentioned, adjust the nozzles. Counterclockwiserotation of either nozzle will move the nozzle closerto the beam and will increase relay output pressure.

For all 3570 Series positioners, examine the end ofthe beam near the bias spring (see figure 3). Thebeam should be approximately centered betweenthe two E-ring travel stops. Observing the cautionabove for 3570C and 3570PC positioners, rotate thenozzle(s) to center the beam between the E-rings.For positioners with two relays, the relay outputpressures must be approximately equal [within 0.3bar (5 psig)] and approximately 75 percent of supplypressure after the beam is centered.

7. Apply an input signal equal to the low value of theinput signal range [0.2 bar (3 psig) in this example].Adjust the bias spring (see figure 3) up or down untilthe valve travel is at the starting point.

8. Loosen the spring lock (see figure 3) and slowlyincrease the input signal toward the high end of theinput signal range [1.0 bar (15 psig) in this example].If the valve travel is less than its expected range,increase the travel by adjusting the range springcounterclockwise. If the valve travel reaches the endof its expected range with an input signal less thanthe high value of the input signal range, decreasethe travel by adjusting the range spring clockwise.

9. Repeat steps 7 and 8 until the valve plug or travelindicator action corresponds to the input signalrequirements of the application [0.2 to 1.0 bar(3 to 15 psig) in this example].

10. Lock the range spring and the bias spring seatin position. The positioner is then ready foroperation.

11. If the positioner is unstable and adjustment doesnot correct the problem, it might be due to unwantedfluctuations in the input signal. A restrictor assembly(key 47, figure 11) can be installed in the input signalcircuit to dampen these fluctuations. The restrictormight help to minimize instability. To take therestrictor out of service, exchange the location of therestrictor with that of the bellows mounting screw(key 46, figure 11).

12. Replace the cover (key 39) on the positioner.


October 2008

13

Table 5. Range(1,2)

Code Number Part Number(3)

1234

1H8914000A21H8915000A21H8916000A21H8917000A2

5678

1H8918000A21H8919000A21H8920000A21H8921000A2

9101112

1H8922000A21H8955000A21H8956270121H8957000A2

13141516

1J5185000A21J5715000A21K5363000A21K6684000A2

17181920

1R6135270121R2822000A21R8535270121R899827012

2122

1U58272701217A3811X022

1. The range spring code number is the first number given in each signal rangecode listed in table 4. For example, for a signal range of 0 to 1.0 bar (0 to 15 psig),an actuator travel of 14.3 mm (9/16-inch), and direct action, the signal range codefrom table 4 is 6G3. The appropriate range spring is indicated by “6”.2. Range springs do not have a color code. All range springs are silver.3. The first six numbers of a range spring part number is also the tag number. Forexample, a range spring with part number 1H8914 000A2 has a tag number of1H8914. Tags are attached to the parts at the time the parts are manufactured.

Table 6. Bias Spring(1,2)

CodeLetter

ColorCode

PartNumber

ABCD

SilverLight blue

RedLight green

1H861827012(3)

1H893227012(3)

1H893327012(3)

1H896827012(3)

EFGH

Dark greenPinkBlackBrown

1J2932X00A2(4)

1J2933000A2(4)

1N7177000A2(4)

1R613427012(3)

1. The bias spring code letter is the letter given in each signal range code listed intable 4. For example, for a signal range of 0 to 1.0 bar (0 to 15 psig), an actuatortravel of 14.3 mm (9/16-inch), and direct action, the signal range code from table 4is 6G3. The appropriate bias spring is indicated by “G”.2. It is necessary to add the bias spring seat (key 8) to a unit when changing froman extension type spring (key 9) to a compression type spring (key 48).3.Compression type bias spring (key 48).4. Extension type bias spring (key 9).

Table 7. Spring Retainer

CODENUMBER(1)

OVERALLLENGTH(2)

EFFECTIVELENGTH(2) PART

NUMBER(3)mm Inches mm Inches

1234

57535048

2-15/642-5/641-63/641-7/8

44403835

1-47/641-37/641-31/641-3/8

1H8907X00121H8908X00121H8909X00121H8911X0012

57810

43252235

1-11/1631/32

7/81-3/8

30121022

1-3/1615/32

3/855/64

1H8910X00121H8912X00121H8552X00121H8913X0012

1213

3829

1-1/21-1/8

2516

121/32

1J3572X00121J9796X0012

1. Code numbers 6, 9, and 11 are not used.2. Refer to figure 3.3. The spring retainer code number is the second number given in each signalrange code listed in table 4. For example, for a signal range of 0 to 1.0 bar (0 to 15psig), an actuator travel of 14.3 mm (9/16-inch), and direct action, the signal rangecode from table 4 is 6G3. The appropriate spring retainer is indicated by “3”.

Table 8. Spring Retainer SpacerOVERALLLENGTH(1)

EFFECTIVELENGTH(1) PART NUMBER(2)

mm Inches mm Inches

4152579497

1-5/82-1/162-1/4

3-11/163-13/16

2940448184

1-1/81-9/161-3/43-3/163-5/16

1L2069X00121J2233461721J8038461721P3957X00121J803946172

1. Refer to figure 3.2. The spacer number is the first 6 characters of the part number and is stampedon the part.

Changing Positioner Action

The instructions given below are to be used after thesprings have been changed or if no spring change isrequired. Numbered parts mentioned in this sectionare shown in figure 6 unless otherwise noted.


October 2008

14

A1088-1/IL

RESTRICTOR2

2

22

22

33

1

1

1

1

1

BEAM

BEAM

BELLOWSBASE

BELLOWSBASE

PEDESTALPEDESTAL

REVERSEACTION

DIRECTACTION

BELLOWS TOP VIEW WITHOPTIONAL RESTRICTOR

1—MOUNTING SCREW2—MOUNTING SCREW3—BELLOWS POST

Figure 6. Bellows Mounting for Direct and Reverse Action

WARNING

The following procedures requiretaking the positioner, actuator, andcontrol valve assembly out of service.To avoid personal injury or propertydamage caused by uncontrolledprocess pressure, provide a temporarymeans of control for the processbefore taking the assembly out ofservice.

Before removing the input signal andsupply pressure connections from thepositioner, remove the input signaland supply pressure sources from theconnections. The sudden release ofpressure can cause personal injury orproperty damage.

Note

Changing the positioner action mightrequire changing the bias springand/or the spring retainer. Refer totable 4 for correct signal range codes.Refer to the Maintenance section fordisassembly and assemblyprocedures.

Changing to Reverse Action1. Bypass the control valve and shut off the inputsignal line and the supply pressure line to thepositioner.

2. Loosen the four thumb screws on the undersideof the positioner base and remove the cover.

3. Two bellows posts are provided. The posts arescrewed into storage holes in the positioner baseimmediately above the CYLINDER andINSTRUMENT connections. Unscrew these posts.

Note

An optional restrictor (see the top viewin figure 6) can be found in place ofone of the bellows mounting screws(number 1). If so, note the location ofthe restrictor and replace it in thesame location during reassembly. Therestrictor has a hex head; themounting screws do not.

4. Remove the four mounting screws (numbers 1and 2) and lift out the bellows assembly.

5. Screw the bellows posts (number 3) into theholes where the screws (number 1) originally were.

6. Invert the bellows and replace the screws(numbers 1 and 2).

7. Refer to the adjustment procedures to checkoperation of the positioner.

8. Make a notation on the action label (key 43,figure 11) that the action of the positioner has beenchanged.


Changing to Direct Action1. Bypass the control valve and shut off the inputsignal line and the supply pressure line to thepositioner.

2. Remove the positioner cover by loosening thefour thumb screws on the underside of the base.

Note

An optional restrictor (see the top viewin figure 6) can be found in place ofone of the bellows mounting screws(number 1). If so, note the location ofthe restrictor and replace it in thesame location during reassembly. Therestrictor has a hex head; themounting screws do not.


October 2008

15

3. Remove the four mounting screws (numbers 1and 2), bellows, and bellows posts (number 3).

4. Invert the bellows and reinstall it in the positioner.Secure the bellows with the four screws (numbers 1and 2). Screw the bellows posts into the storageholes provided in the base immediately above thecylinder and instrument connections.

5. Refer to the adjustment procedures to check theoperation of the positioner. If the input signal rangehas not been changed, adjustment of the rangespring might not be necessary.

6. Make a notation on the positioner action label(key 43, figure 11) that the action of the positionerhas been changed.


Split Range Operation

The 3570 Series valve positioners are suitable forsplit range operation. In split range operation, two ormore control valves are operated by one outputsignal from a single control device. When two controlvalves are split ranged, one valve strokes fully withone half the input signal range and the second valvestrokes fully with the other half of the input signalrange.

Valve positioners shipped from the factory for splitrange operation are constructed and adjustedaccordingly. If it is necessary to convert an existingpositioner to one suitable for split range operation,refer to table 4. If the application requires a selectionnot listed in table 4, consult your Emerson ProcessManagement sales office to determine the new partsrequired. For most changes, a new range spring andpossibly a new bias spring will be required. A newrange spring retainer might also be required for3570, 3570C, 3572, and 3573 positioners.

When corresponding with your Emerson sales office,supply all information possible about the desiredoperating conditions and the serial numbers of thecontrol valve assembly. This information will facilitatethe proper selection of the required parts.

To change an existing valve positioner to onesuitable for split range operation, refer to the rangeand bias spring removal and replacementprocedures in the Maintenance section. Be certainthe required new parts are on hand before beginningany maintenance operation.

Initial Range Spring ExtensionProcedures for 3570P And 3570PCPositioners

This procedure must be performed whenever therange spring has been changed or the positioner hasbeen removed. Key numbers used in this procedureare shown in figure 14 except where indicated.

1. With the cap screw (key 87) removed, hook thesmall ball of the positioner cable (key 91) into theslot of the smaller portion of the cable spool (key96). Wind the cable on the spool until the coils of therange spring (key 18, figure 11) are slightlyseparated. Be certain the cable is wound so that itcomes off the side of the spool opposite the accessopening and that the cable cannot cross itself on thespool.

2. Install the ball end of the actuator cable (key 92)into the slot of the large portion of the spool that iscloser to the access opening. Wrap the cable on thespool as many times as possible, then bring thecable out through the bottom of the positionerextension. Be certain the cable is wound so that itcomes off the side of the spool opposite the accessopening and that the cable cannot cross itself on thespool. Attach the cable to the cable strap (key 93),leaving approximately a 0.8 mm (1/32-inch) gapbetween the cable eye and cap screw head (key 94).

3. With the actuator piston rod completely retractedand the range spring coils slightly separated, attachthe cable strap to the actuator feedback arm. Usethe set of cable-strap holes closest to the rangespring. Turn the spring cap (key 86) one turncounterclockwise and install one cap screw (key 87).

4. Adjust the range spring (key 18, figure 11) toobtain full travel for the input signal range (spanadjustment). Refer to step 7 of the adjustmentprocedures. Adjustment of the bias spring (zeroadjustment) does not need to be done at this time.

5. Remove the screw from the spring cap andslowly release the torsion spring force by turning thespring cap clockwise. Disconnect the cable strapfrom the actuator and remove all range springextension by rotating the cable spool.

6. Rotate the cable spool to obtain the correct initialrange spring extension. Each full revolution of thespool extends the range spring 50.8 mm (2 inches)[6.4 mm (1/4-inch) for 1/8 revolution]. If the initialrange spring extension is not specified, calculate itusing one of the equations given below. Round offthe amount of extension (e) obtained from theequation to the next higher 6.4 mm (1/4 inch).


October 2008

16

T

1.87 (Pn)(standard bellows)e =

T

1.25 (Pn)(optional high pressure bellows)e =

where:

e = initial range spring extension required in mm

T = actuator travel in mm

Pn = input signal span in bar (for example, 0.8 barfor

a 0.2 to 1 bar input signal range)

or where:

e = initial range spring extension required in inches

T = actuator travel in inches

Pn = input signal span in psi (for example, 12 psi for

a 3 to 15 psig input signal range)

7. If necessary, move the actuator cable ball to thespool slot nearer the access opening. With theactuator piston rod fully retracted and the rangespring at the correct initial extension, attach thecable strap to the actuator feedback arm. Use theset of cable strap holes that is closest to the tappedholes in the feedback arm.

8. Refer to the positioner adjustment procedures.

Principle of Operation

3570, 3570C, 3570P, 3570PC, and 3571Valve PositionersRefer to the schematic diagram in figure 7. Thepneumatic output signal from a control device ispiped to the positioner bellows. For explanationpurposes, assume this signal has increased. Thebellows expands and moves the beam, which pivotsaround a fixed point and simultaneously uncoversthe nozzle of relay B and covers the nozzle of relayA. The nozzle pressure in relay A increases due to

BOTTOM CYLINDERPRESSURE

NOZZLE PRESSURE

TOP CYLINDER PRESSURE

SUPPLY PRESSURE

INPUT SIGNAL PRESSURE

YOKE

RELAY “A’’

BELLOWSREVERSEDPOSITION

RELAY “B’’RANGE SPRING

CYLINDER

R = RESTRICTION

A1067-1 / IL

BIASSPRING

SUPPLY

R

INPUTSIGNAL

R

SUPPLY

Figure 7. Schematic Diagram of Fisher� 3570 Positioner witha 470 Series Pneumatic Piston Actuator

the restriction created by the beam covering thenozzle. Through relay action, the pressure to the topof the piston increases. At the same time, relay Breacts to the change in beam position to decreasethe pressure to the underside of the piston. Theseunbalanced pressures move the actuator pistondown.

In the 3570 and 3570C positioners, the pistonmovement is fed back to the beam by means of arange spring, which is connected to the beam and tothe piston rod extension. In the 3570P, 3570PC, and3571 positioners, the feedback is provided to therange spring by a cable or wire that is connected tothe actuator-valve stem connector. The downwardmovement of the piston rod extension extends therange spring until the torque on the beam balancesthe torque exerted by the instrument bellows.

As the input signal decreases, the reverse actiontakes place. The bellows contracts, and as the beampivots, it covers the nozzle of relay B and uncoversthe nozzle of relay A. Through relay action, thepressure below the piston increases and thepressure above the piston decreases to move thepiston upward.


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17

CR4006-AA1084-1/IL

BELLOWSREVERSEDPOSITIONRANGE SPRING

BIASSPRING

CYLINDER

INPUTSIGNAL

R

R = RESTRICTION

PISTON

RELAY A

YOKE

SUPPLY


SUPPLY PRESSURE

TOP CYLINDER PRESSURE

NOZZLE PRESSURE

Figure 8. Schematic Diagram of Fisher� 3572 Positioner witha 472 Pneumatic Piston Actuator

3572 and 3576 Valve Positioners

Refer to the schematic diagram in figure 8, whichshows the 3572 positioner mounted on a 472pneumatic piston actuator. For the 3576 positioner,the principle of operation is identical to the 3572positioner but the actuator can be a direct or reverseacting pneumatic diaphragm actuator.

The pneumatic output signal from a control device ispiped to the positioner bellows. For explanationpurposes, assume this signal has increased. Thebellows expands and moves the beam, which pivotsaround a fixed point and covers the relay nozzle.The nozzle pressure in the relay increases due to

the restriction created by the beam covering thenozzle. Through relay action, the pressure above thepiston overcomes the force exerted by the actuatorspring, and the piston moves downward. Thischanges the valve plug position.

In the 3572 positioner, piston movement is fed backto the beam by means of a range spring, which isconnected to the beam and the piston rod extension.As the piston rod extension moves downward, therange spring is extended until the torque of the beambalances the torque exerted by the instrumentbellows.

In the 3576 positioner, the feedback is provided tothe range spring by a wire that is connected to theactuator-valve stem connector.

As the input signal decreases, the reverse actiontakes place. The bellows contracts, and as the beampivots, it uncovers the relay nozzle. Through relayaction, the pressure on top of the piston decreases,and the force of the actuator spring moves the pistonupward.

3573 and 3577 Valve Positioners

Refer to the schematic diagram in figure 9, whichshows the 3573 positioner mounted on a 473pneumatic piston actuator. For the 3577 positioner,the principle of operation is identical to the 3573positioner, but the actuator can be direct or reverseacting.

The pneumatic output signal from a control device ispiped to the positioner bellows. For explanationpurposes, assume this signal has increased. Thebellows expands and moves the beam, which pivotsaround a fixed point and uncovers the relay nozzle.The nozzle pressure decreases due to theuncovering of the nozzle by the beam. Through relayaction, the pressure to the underside of the pistondecreases. The force exerted by the actuator springovercomes the force of the pressure below thepiston, and the piston moves downward. Thischanges the valve plug position.

In the 3573 positioner, piston movement is fed backto the beam by means of a range spring, which isconnected to the piston rod extension. Thedownward movement of the piston rod extensionextends the range spring until the torque of thebeam balances the torque exerted by the instrumentbellows.


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CR4007-AA1082-1/IL


SUPPLY PRESSURE

BOTTOM CYLINDER PRESSURE

NOZZLE PRESSURE

INPUTSIGNAL

R

R = RESTRICTION

PISTON

YOKE

SUPPLY

BELLOWSREVERSEDPOSITIONRANGE SPRING

BIASSPRING

CYLINDER

RELAY

Figure 9. Schematic Diagram of Fisher� 3573 Positioner with473 Pneumatic Piston Actuator

In the 3577 positioner, feedback is provided to therange spring by a wire that is connected to theactuator-valve stem connector.

As the input signal decreases, the reverse actiontakes place. The bellows contracts, and as the beampivots, it covers the relay nozzle. Through relayaction, the pressure on the underside of the pistonincreases to overcome the force exerted by theactuator spring, and the piston moves upward.

Relay Operation

Refer to figure 10, which shows a sectional view of atypical relay.

W0700-1/IL

CLEAN-OUTPLUNGER

SUPPLY

OUTPUT

B

A

C

EXHAUST

F

E

R

D

G

A−SUPPLY PRESSURE AREAB−RELAY OUTPUT PRESSURE VALVEC−EXHAUST VALVED−RELAY OUTPUT PRESSURE AREAE−DIAPHRAGM HEAD ASSEMBLYF−NOZZLEG−RELAY RESTRICTION PLUG ASSEMBLYR−FIXED RESTRICTION

NOTES:OUTPUT PORT IS SHOWN

90 DEGREES TO THE FRONT OFACTUAL LOCATION.

1

1

40A8972-B/DOC

NOZZLE AND LOCKNUTUSED WITH 3570C AND3570PC POSITIONERS

Figure 10. Sectional View of a Typical Relay

Supply pressure reaches the relay(s) throughpassages in the positioner base and is channeled tofixed restriction R and to point A between the supplyvalve B and the balancing O-ring of the relay valve.The fixed restriction is an integral part of the relayrestriction plug and wire assembly G. The orifice innozzle F is larger than the fixed restriction. Thisallows the supply pressure to bleed to atmospherefaster than it enters the unit through the fixedrestriction when the beam flapper is away from thenozzle.

Assume that a change in the input signal causes thebeam flapper to cover the nozzle of a relay. Thesupply pressure flows through fixed restriction R intothe chamber between the two relay diaphragms.Due to the restricting effect of the flapper over thenozzle, pressure builds up in the chamber betweenthe diaphragms, forcing the diaphragm head


October 2008

19

assembly E downward to open supply valve B,allowing output pressure to increase.

The supply pressure flows past supply valve B toincrease the output pressure to the actuator cylinder.The cylinder pressure (relay output pressure) alsoacts on the area D. This provides an air feedbackthat returns the diaphragm head assembly E and themovable nozzle F to their original positions, thuspreventing any further increase in output pressure.The feedback arrangement and the movable nozzleensure accurate and stable positioning of theactuator piston without introducing cycling orover-correction. After any change in the outputpressure, supply valve B and exhaust valve Calways return to the closed position to put the nozzleback in its original, or equilibrium, position. Thespring behind supply valve B aids in closing thevalve as the diaphragm head assembly is forcedupward.

When the beam flapper moves away from the nozzleF, the supply pressure bleeds out at a greater ratethan it enters through the fixed restriction R. Thepressure then decreases in the chamber betweendiaphragms. The force of the cylinder pressureacting on area D pushes diaphragm head assemblyE upward, opening exhaust valve C. Cylinderpressure bleeds through the exhaust port toatmosphere. As the cylinder pressure decreases andthe force on area D decreases, the force of thenozzle pressure in the chamber between thediaphragms returns the assembly to its originalposition. The unit is again in equilibrium, but at alower nozzle pressure and a lower output pressure.

Each relay has a 4:1 ratio between the nozzlepressure and the output pressure. For example, a0.7 bar (10 psig) nozzle pressure change, producesa 2.7 bar (40 psig) output pressure change; a 1.4 bar(20 psig) nozzle pressure change produces an 5.5bar (80 psig) output pressure change. With aconstant input signal pressure, the internal parts ofthe relay are at equilibrium with the supply andexhaust valves closed.

MaintenanceParts are subject to normal wear and must beinspected periodically and replaced as necessary.The frequency of parts inspection and replacementdepends upon the severity of service conditions.When inspection or repairs are required,disassemble only those parts necessary toaccomplish the task.

WARNING

Avoid personal injury from suddenrelease of process pressure. Beforeperforming any maintenanceoperations:

� Always wear protective clothing,gloves, and eyewear.

� Disconnect any operating linesproviding air pressure, electric power,or a control signal to the actuator. Besure the actuator cannot suddenlyopen or close the valve.

� Vent the power actuator loadingpressure and relieve any actuatorspring precompression.

� Use lock-out procedures to besure that the above measures stay ineffect while you work on theequipment.

� Personal injury or propertydamage may result from fire orexplosion if natural gas is used as thesupply medium and preventativemeasures are not taken. Preventativemeasures may include: Remoteventing of the unit, re-evaluating thehazardous area classification,ensuring adequate ventilation, and theremoval of any ignition sources. Forinformation on remote venting of thispositioner, refer to page 6.

� Check with your process or safetyengineer for any additional measuresthat must be taken to protect againstprocess media.

TroubleshootingIf the positioner causes sluggish or erratic operationor the malfunctioning of the actuator, first, be certainthat the range springs, bias springs, and springretainer are correct for the application. Refer to table4 or consult your Emerson Process Managementsales office.

If the springs and spring retainer are correct, andcareful adjustment of the unit does not producesmooth and satisfactory operation, check thefollowing points. Key numbers used in this procedureare shown in figure 11 except where indicated.Figure 2 shows part locations.


October 2008

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1. Clean out the primary orifice on each relay bydepressing the clean-out plunger. The plunger islocated in the orifice assembly (key 29S). Thisoperation runs a fine wire through the orifice to clearthe hole.

2. Check the nozzle (key 29Q) of each relay forplugging. To clean, swing the flapper (key 12) awayfrom the nozzle by loosening the screw that holdsthe flapper in place.

CAUTION

The relays used in 3570C and 3570PCpositioners use a locknut (key 29P,figure 12) on the nozzle (key 29Q,figure 12). If the nozzle is rotated whenthe locknut is tight, damage to therelay diaphragm will result. Always usea wrench on the nozzle to prevent itfrom turning while loosening ortightening the locknut.

Unscrew the nozzle and run a fine wire through it.Do not enlarge the hole. Also check the surface ofthe flapper for any accumulation of dirt or foreignmaterials.

3. Check the bellows assembly for damage,misalignment, or leakage. Also check all gasketedjoints for leakage. Use soap solution for leakdetection.

4. Check the beam for damage, binding or rubbingagainst stationary parts. Check the flexure stripscrews (key 17) for tightness.

5. If the positioner operation has improved, refer tothe adjustment procedures.

6. If the relays require replacement, go to step 7.

7. Unscrew the three machine screws (key 31) fromeach relay and remove the relays.

8. Mount the relays in their respective positions onthe positioner pedestal, making certain that the relaygasket (key 30) is in good condition and is in place.

9. If the positioner operation is still sluggish, a slightadjustment of the bias spring post (see figure 3)might be necessary. Loosen the locknut and rotatethe post in half-turn increments, checking after eachhalf turn for proper operation. Rotate the post nomore than two turns from the position shown infigure 3. Refer to the adjustment procedures afterrotating the post to check the position of the postand beam assemblies.

Converting a 3570 Valve Positioner to a3570C Valve PositionerIf desired, tire valves can be substituted for pressuregauges. Also, locking relay nozzles can be added onany 3570 Series positioner. This provides theconstruction that is standard with 3570C and3570PC positioners.

Key numbers used in this procedure are shown infigure 11 except where indicated. Whenreassembling, coat all pipe threads with a goodquality pipe thread compound.

1. Isolate the control valve from the line pressureand release pressure from both sides of the valvebody. If using a power actuator also shut-off allpressure lines to the power actuator and release allpressure from the actuator. Use lock-out proceduresto be sure that the above measures stay in effectwhile you work on the equipment.

2. Loosen the knurled screws (key 38) and removethe cover (key 39).

3. Disconnect the tubing assemblies (keys 28 and 45) from the base and from the gauges (keys 24and 25). Unscrew the hex nuts (key 27) from theback of the gauges and remove the gauges (keys 24and 25).

4. Unscrew the pressure gauge (key 54) from thegauge adaptor (key 29U).

5. Unscrew and remove the nozzle and spring (keys29Q and 29P) from each relay.

6. The gauge bracket (key 5) can be removed ifdesired. To remove it, loosen the locknut (key 7) andremove the bias spring post and cap screw (keys 6and 32). When replacing the bias spring post, besure that the bottom of the post thread is positionedas shown in figure 3 for proper positioning of theE-ring travel stops. This alignment can be verifiedvisually through the vent port.

7. Use compression plugs (key 52) to plug the holesopened in the base when the tubing is removed.

CAUTION

Never rotate the nozzle (key 29Q) whenthe locknut (key 29P) is tight, ordamage to the relay diaphragm willresult. Always use a wrench on thenozzle to prevent it from turning whileloosening or tightening the locknut.

8. Install the locknut and nozzle (keys 29P and 29Q)on each relay.


October 2008

21

9. Install the tire valve (key 26, figure 12) into thegauge adaptor (key 29U).

10. Install the service tee and tire valve adaptor(keys 49 and 53, figure 12) into the CYLINDERconnection. Connect the pressure line that runs tothe lower part of the cylinder to the service tee.

11. Install the pipe nipple, pipe tee, and tire valveadaptor (keys 50, 51, and 53, figure 12) into theINSTRUMENT connection. Connect the input signalline to the pipe tee.

12. Refer to the adjustment procedures.

Range Spring

DisassemblyUnless otherwise directed, key numbers refer tofigures 11 and 12.

WARNING

The following procedure requirestaking the positioner, actuator, andcontrol valve assembly out of service.To avoid personal injury or propertydamage caused by uncontrolledprocess pressure, provide a temporarymeans of control for the processbefore taking the assembly out ofservice.

Before removing the input signal andsupply pressure connections from thepositioner, remove the input signaland supply pressure sources from theconnections. The sudden release ofpressure can cause personal injury orproperty damage.

1. Bypass the control valve and shut off the inputsignal and the supply pressure lines to thepositioner.

2. Remove the positioner cover (key 39).

3. Loosen the spring lock (see figure 3) that holdsthe range spring (key 18) to the beam.

4. Disconnect the other end of the range spring byperforming one of the following steps:

� For 3570, 3570C, 3572, and 3573positioners, use a screwdriver to remove the springretainer (key 19, figure 3) from the piston rodextension.

� For 3570P and 3570PC positioners (seefigure 12), remove the screws (key 87), from the cap(key 86) and rotate the cap clockwise to remove alltorsion spring force. Disconnect the actuator cable(key 92) from the cable strap (key 93). Unhook thepositioner cable (key 91) from the cable spool (key96).

� For 3571, 3576, and 3577 positioners, loosenthe set screw found in the spring retainer (key 56A,figure 13) and remove the spring wire (key 56D)from the retainer.

5. Remove the range spring from the beam byrotating the range spring counter clockwise.

Assembly1. Install the new range spring. For 3570, 3570C,3572, and 3573 positioners, also install the springretainer. See figures 3 or 11.

2. Reconnect the range spring to the piston rodextension (3570, 3570C, 3572, and 3573positioners) or the feedback wire (3571, 3576, and3577 positioners, figure 13). For 3570P and 3570PCpositioners, install the positioner cable (key 91,figure 14) in the range spring so that the large ballon the cable seats in the conical portion of thespring.

3. Install the spring lock (key 20, figure 11). Adjustthe positioner per instructions in the adjustmentsprocedures.

The action of the positioner can be reversed in thesame manner as described in the changingpositioner action procedures. However, beforeattempting to reverse the action, see table 4 orconsult your Emerson Process Management salesoffice to determine if any different parts are required.

Bias Spring

Disassembly1. Refer to figure 3. Remove the top E-ring travelstop.

2. Loosen the locknut securing the bias spring seatin place. Then rotate the adjusting screw until thespring force is at a minimum.

3. Loosen the locknut that secures the bias springpost to the positioner base. Using a screwdriver inthe slot in the top of the post, unscrew the post fromthe base.

4. Tilt the bottom of the post out and remove thepost from the beam.


October 2008

22

5. Remove the locking nuts and the spring seat fromthe bias spring post.

Assembly1. Install the new bias spring, spring seat, andlocking nuts on the bias spring post.

2. Replace the bias spring post into the beam andinstall the top E-ring travel stop.

3. Install the bias spring post into the base. Becertain that the bottom of the post thread ispositioned as shown in figure 3. Ensure that thebeam does not rub on the post.

4. For 3570P and 3570PC positioners, go to theinitial range spring extension procedures for 3570Pand 3570PC positioners.

5. Adjust the positioner as described in theadjustments procedures.

The action of the positioner can be reversed in thesame manner as described in the changingpositioner action procedures. However, beforeattempting to reverse the action, see table 4 orconsult your Emerson Process Management salesoffice to determine if a different retainer, differentrange springs or different bias springs are required.

Parts OrderingA serial number is assigned to each positioner. Theserial number is stamped on the nameplate. Alwaysrefer to the serial number when corresponding withyour Emerson Process Management sales officeregarding spare parts or technical information. Whenordering replacement parts, also specify thecomplete 11-character part number from the partskits or parts list information.

WARNING

Use only genuine Fisher replacementparts. Components that are notsupplied by Emerson ProcessManagement should not, under anycircumstances, be used in any Fisherinstrument. Use of components notsupplied by Emerson may void yourwarranty, might adversely affect the

performance of the valve, and couldcause personal injury and propertydamage.

Note

Neither Emerson, Emerson ProcessManagement, nor any of their affiliatedentities assumes responsibility for theselection, use, or maintenance of anyproduct. Responsibility for properselection, use, and maintenance of anyproduct remains with the purchaserand end-user.

Parts Kits

Note

Parts kits for the 3570 Series positioners containthe gaskets, diaphragms, and O-ring seals asspecified by the type and temperature limitations.Parts are for 3570, 3570C, 3570P, and 3570PCpositioners.

Positioner Repair KitsDescription Part Number

Positioner kit includes:Keys 3, 12, 29 (qty. 2), 30, 33, and 37For the 3570 R3570X00022For the 3570C R3570CX0022For the 3570C (hi-temp. const.) R3570CX0H32

Diagnostic Test Connection Kits

Note

Part numbers are shown for recommended sparesonly. For part numbers not shown, contact yourEmerson Process Management sales office.

Kit includes pipe tee, pipe nipple, pipe bushings, connectorbody, and body protector used with the FlowScanner.

For Diaphragm ActuatorsStainless steelSteel

For Piston ActuatorsStainless steelSteel

Pipe Thread Sealant (not furnished withhardware or connectors)


October 2008

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40A8973-CB1840/IL

1

1

2

2

NOTES:ZERO ADJUSTMENTS IS PART OF KEY 9 FOR EXTENSION TYPE BIAS SPRING.ZERO ADJUSTMENTS IS PART OF KEY 9 FOR EXTENSION TYPE BIAS SPRING.

EXTENSION TYPEBIAS SPRINGASSEMBLY

SECTION OF PART 29

PART 22DIRECTACTION

1/4 NPTCYLINDERBOTTOMCONNECTION

1/4 NPTSUPPLYCONNECTION

1/4 NPTINPUT SIGNALCONNECTION

3/8 NPTVENTCONNECTION

Figure 11. Fisher� 3570 Positioner

Parts List

Positioner Common Parts (figures 11 and 12)

Note

Part numbers are shown for recommended sparesonly. For part numbers not shown, contact yourEmerson Process Management sales office.

Key Description Part Number

1 Pilot base, aluminum2 Pedestal, aluminum3* Pedestal gasket

Chloroprene (std. const.) 1H854703012Fluorocarbon (hi-temp. const.) 1H8547X0012

4 Machine screw, pl steel (5 req’d)5 Gauge bracket, pl steel

For all types except 3570C6 Bias spring post, pl steel7 Hex nut, pl steel (2 req’d)8 Spring seat, pl steel (use with key 48 only)

*Recommended spare parts


October 2008

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40A8972-BB1841/IL

EXTENSIONTYPE BIASSPRINGASSEMBLY

SECTION OF PART 29

PART 22DIRECTACTION

Figure 12. Fisher� 3570C Positioner


9 Bias Spring, extension typeColor Code:BlackPinkDark green

10 Retaining ring, pl steel (2 req’d)11 Beam, aluminum12 Flapper, SST (2 req’d)13 Flapper arm, aluminum14 Horizontal flexure strip (2 req’d)15 Vertical flexure strip16 Machine screw, pl steel (2 req’d)17 Machine screw, pl steel

For 3570, 3570C, 3571 (12 req’d)For 3572, 3573, 3576, 3577 (11 req’d)

18 Range Spring, pl steel See table 519 Spring retainer, SST See table 720 Spring lock, SST21* Bellows assembly, brass

To 3.4 bar (50 psig) 1H8610000A2High pressure bellows, brass,over 3.4 bar (50 psig) 1H9010000A2

22 Bellows post, brass (2 req’d)


23 Name plate, aluminum24* Instrument gauge, plastic case/brass wetted parts

For all types except 3570C0-30 psi/0-.2 MPa/0-2 bar 21B4037X0120-60 psi/0-.4 MPa/0-4 bar 21B4037X022

25* Cylinder bottom gauge, plastic case/brass wetted partsFor 3570, 3571, 3573, 35770-160 psi/0-1.1 MPa/0-11 bar 21B4037X032

26 Valve AssemblyFor 3570C only

27 Hex nut, brassFor 3570, 3571, 3573 (2 req’d)For 3572, 3576, 3577 (1 req’d)For 3570C (none req’d)

28 Instrument tubing assembly, copperFor all types except 3570C

29 Relay assembly See Repair Kits30 Relay gasket, (2 req’d)

Chloroprene (std. const.)Fluorocarbon (hi-temp. const.)

31 Machine screw, pl steelFor 3570, 3570C, 3571 (6 req’d)For 3572, 3573, 3576, 3577 (3 req’d)



October 2008

25


32 Cap screw, pl steel (2 req’d)33* O-ring

Nitrile (std. const.) 1C853806992Fluorocarbon (hi-temp. const.) 1C8538X0052

34 Spring anchor, SST35 Machine screw, pl steel (2 req’d)36 Pipe plug, pl steel37* Cover gasket,

Cork (std. const.) 1H853804042Silicone (hi-temp. const.) 1H853804142

38 Cover screw, pl steel (4 req’d)39 Cover, aluminum40 Washer, brass plated (2 req’d)

41 Relay blank, aluminum (see figure 14)For 3572, 3573, 3576, 3577

42 Screw, SST (see figure 14)For 3572, 3573, 3576, 3577 (3 req’d)

43 Label, paperFor direct-acting unitsFor reverse-acting units

45 Cylinder tubing assembly, copperFor 3570, 3571, 3573, 3577

46 Bolt, brassw/o restrictor assembly (2 req’d)w/restrictor assembly (1 req’d)

47 Restrictor assembly, SST48 Bias spring, compression type, pl steel

Color Code:SilverLight blueRedLight greenBrown

49 Service tee, ironFor 3570C only

50 Pipe nipple, pl steelFor 3570C only

51 Pipe tee, ironFor 3570C only

52 Compression plug, brassFor 3570C only (2 req’d)

53 Adaptor, brassFor 3570C only (2 req’d)

54* Cylinder top gauge,plastic case/brass wetted parts,For 3570, 3571, 3572, 3576triple scale, 0-160 psi/0-1.1 MPa/0-11 bar 11B4040X032dual scale, 0-160 psi/0-11 kg/cm2 11B4040X062

Note

Refer to figure 13 for keys 55 through 26E.

55 Mounting bracket, aluminumFor 3571, 3576, 3577

56A Spring retainer, pl steelFor 3571, 3576, 3577

56B Set screw, pl steelFor 3571, 3576, 3577 (2 req’d)

40A9335-CA3230/IL

REVERSE BOOT FORTRAVELS OVER50.8 mm (2 INCHES)

NOTE:RELAY BLANK AND SCREWS (KEY 42 AND 42) ARE INSTALLED

WHERE SHOWN FOR 3573 AND 3577 POSITIONERS. FOR 3572 AND3576 POSITIONERS, THESE PARTS ARE INSTALLED ON THE OPPOSITE SIDE OF THE POSITIONER

Figure 13. Feedback Wire Assembly (Typical withFisher� 3571, 3576, and 3577 Positioners)


56C Boot, chloropreneFor 3571, 3576, 3577

56D Spring wire, pl steelFor 3571For 3576, 3577

56E End bearingFor 3571, 3576, 3577

75 Tubing, copper (specify length)77 Elbow, 3/8-inch, brass (specify quantity)78 Connector, 3/8-inch brass (specify quantity)84 Spring retainer spacer, SST See table 888 Torsion spring, steel89 Extension cover, aluminum

Note

Refer to figure 14 for keys 86 through 104.

86 Spring cap assembly, aluminum and SST87 Machine screw, pl steel (2 req’d)90 Machine screw, pl steel (6 req’d)91 Positioner cable92 Actuator cable93 Cable strap, brass94 Cap screw, pl steel (3 req’d)95 Hex nut, pl steel96 Cable spool, acetal plastic



October 2008

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41A7131-AB1839/IL

TYPICALMOUNTINGFOR 3570P AND3570PC POSITIONERS

VIEW A-A

Figure 14. Fisher� 3570P and 3570PC Positioner


97 Spring guide, aluminum98 Warning plate99 Self-tapping screw, pl steel100 Cap screw, pl steel (2 req’d)101 Positioner extension assembly, aluminum102 Washer, SST

For 3572, 3576 (1 req’d)For 3570, 3571, 3573, 3577 (2 req’d)

235 Spring retainer spacer, SST

104.8 mm (4-1/8 inches) maximum actuator travel,54.0 mm (2-1/8 inches) or less valve travel

206.4 mm (8-1/8 inches) maximum actuator travel,between 54.0 mm (2-1/8 inches) and 104.8 mm(4-1/8 inches) valve travel (2 different spacers req’d)

206.4 mm (8-1/8 inches) maximum actuator travel,less than 54.0 mm (2-1/8 inches) valve travel (2 req’d)


October 2008

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October 2008

28

Emerson Process Management Marshalltown, Iowa 50158 USASorocaba, 18087 BrazilChatham, Kent ME4 4QZ UKDubai, United Arab EmiratesSingapore 128461 Singaporewww.Fisher.com

�Fisher Controls International LLC 1974, 2008; All Rights Reserved

Fisher and FlowScanner are marks owned by one of the companies in the Emerson Process Management business division of Emerson ElectricCo. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marksare the property of their respective owners.

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fisher 3570 series pneumatic valve positioners · 2019-11-22 · this manual provides installation,...

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