TM 10-6640-218-13&P

TECHNICAL MANUAL

OPERATOR’S, UNIT ANDDIRECT SUPPORT MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

FOR

PRECISION GENERAL PURPOSE OVENSModel TS-31 477 AU-2

NSN 6640-00-359-9880

This technical manual is an authentication of the manufacturer’s commercial literature anddoes not conform with the format and the content requirements normally associated withArmy technical manuals. Thi s technical manual does, however, contain all essentialinformation required to operate and maintain the equipment.

Approved for public release; distribution is unlimited.

HEADQUARTERS, DEPARTMENT OF THE ARMY28 SEPTEMBER 1990

TM 10-6640-218-13&P28 September 1990

This technical manual is an authentication of the manufacturer’s commercial literature anddoes not conform with the format and the content requirements normally associated withArmy technical manuals. This technical manual does, however, contain all essentialinformation required to operate and maintain the equipment.

Approved for public release; distribution Is unlimited.

SUPPLEMENTARY INTR0DUCTORY MATERIAL

1-1. Maintenance Forms and Records.

Department of the Army forms and Procedures used for equipment maintenance will be those describedby DA Pam 738-750, The Army Maintenance Management System.

1-2. Reporting Errors and Recommending Improvements.

You can help improve this manual. If you find any mistakes or if you know of a way to improve theprocedures, please let us know. Mail your letters, DA Form 2028 (Recommended Changes toPublications and Blank Forms), or DA Form 2028-2” located in the back ofCommander, U.S. Army Troop Support Command, ATTN: AMSTR-MCTS,St. Louis, MO 63120-1798. A reply will be furnished to you.

1-3. Destruction of Army Material to Prevent Enemy Use.

this manual, directly to:4300 Goodfellow Blvd.,

Refer to TM 750-244-3 for instructions covering the destruction of Army Material to prevent enemy use.

1-4. Administrative Storage of Equipment.

a. Placement of equipment in administrative storage should be for short periods of time when ashortage of maintenance effort exists. Items should be in mission readiness within 24 hours or within thetime factors as determined by the directing authority. During the storage period appropriate maintenancerecords will be kept.

b. Before placing equipment in administrative storage, current preventive maintenance checks andservices should be completed. Shortcomings and deficiencies should be corrected, and all modificationwork orders (MWO'S) should be applied.

c. Storage site selection. Inside storage is preferred for items selected for administrative storage. Ifinside storage is not available, trucks, vans, conex containers and other containers may be used.

i/(ii Blank)

Precision Scientific

TS-31477 AU 8A

ADDENDUM TO: INSTRUCTION MANUAL

TS-31477 AU-2 GENERAL PURPOSE OVENS

The following corrections are made to the parts list, page 19.

Item 7 - Dual Pilot (White & Red): Change part numbers 247148 to 234148

Item 8 - Sensor, Temperature: For STM 135 only. Change part number 00870601 to

00870602

Item 18 - Blower, Wheel: Change part numbers 257024 to 275024.

Precision Scientific Inc.3737 W. Cortland St.~Chicago, IL 60647-312-227-2660 Telex: 4330120(ITT), 254028(WU)-FAX 312-227-1828

P r e c i s i o n

Instruction Manual TS-31477 AU-2

Precision Scientific

Precision Scientific Inc. 3737 W. Cortland St. - Chicago, IL 60647 ■ 312-227-2880 Tab: 4330120 (ITT), 254028 (WU) Fax: 312-227-1828

TS-31477 AU-2

General purpose ovensCatalog No’s 31477, 31478, 31540, 31541, 31542,31551, 31552, 31553, 31554, 31555, 31556, & 31557.

Your satisfaction and safety are impor-tant to PRECISION SCIENTIFIC and acomplete understanding of this unit isnecessary to attain these objectives.

As the ultimate user of this apparatus,it is your responsibility to understandits proper function and operationalcharacteristics. This instructionmanual should be thoroughly read andall operators given adequate trainingbefore attempting to place this unit inservice. Awareness of the statedcautions and warnings, and compliancewith recommended operating parameters--together with maintenance requirements--are important for safe andsatisfactory operation. The unitshould be used for its intendedapplication; alterations or modifica-tions will void the Warranty.

This product is not intended, nor canit be used, as a sterile or patientconnected device. In addition, thisapparatus is not designed for use inClass I, II, or III locations as de-fined by the National Electrical Code..

Unpacking and damage

Save all packing material if apparatusis received damaged. This merchandisewas carefully packed and thoroughlyinspected before leaving our factory.

Responsibility for its safe deliverywas assumed by the carrier upon accep-tance of the shipment; therefore,claims for loss or damage sustained intransit must be made upon the carrierby the recipient as follows:

Visible Loss or Damage: Note anyexternal evidence of loss or damage onthe freight bill, or express receipt,and have it signed by the carrier’sagent. Failure to adequately describesuch external evidence of loss ordamage may result in the carrier’srefusing to honor your damage claim.The form required to file such a claimwill be supplied by the carrier.

Concealed Loss or Damage: Concealedloss or damage means loss or damagewhich does not become apparent untilthe merchandise has been unpacked andinspected. Should either occur, make awritten request for inspection by thecarrier’s agent within 15 days of thedelivery date; then file a claim withthe carrier since the damage is thecarrier’s responsibility.

By following these instructions care-fully, we guarantee our full support ofyour claim to be compensated for lossfrom concealed damage.

DO NOT -- FOR ANY REASON -- RETURN THISUNIT WITHOUT FIRST OBTAININGAUTHORIZATION. In any correspondenceto PRECISION SCIENTIFIC please supplythe nameplate data, including catalognumber and serial number.

-1-

General information soil samples, semi-conductor aging, anddrying materials for chemical analysis.

This instruction manual encompasses thefollowing models and their specificelectrical characteristics.

All of the Model STG gravity convectionovens and the Model STM 40 mechanical— —convection oven use two highly accuratehydraulic thermostats--one control andone high limit safety--from a singlecontrol. This provides a sensitivity to±0.25°C.

Models STM 40. STM 80 & STM 135 ovensIuse mechanical convection as a methodof heat transfer. Mechanical convec-tion can be defined as a positive andplanned directional air flow or forcedair circulation within their respectivechambers.

Air is drawn into the chamber throughthe meter shaft opening located in thebottom of the oven and is heated as itpasses over the heating coils. The airis blown through the duct network andforced into the chamber through calcu-lated openings In the side diffuserwalls.

Models STG 40. STG 80. STG 145 employgravity convection as a method of heattransfer within their respective cham-bers. Gravity convection is defined asthe natural tendency for heated air torise due to its change in density andmass. A limited amount of the heated air is

exhausted out of the chamber throughthe openings in the vent cap located ontop of the oven and the remaining airrecirculates within the chamber.

Air is drawn into the chamber throughopenings in the bottom of the oven thenheated as it passes over the heatingcoils and up through the openings inthe diffuser panel located on the bot-ton of the chamber. A limited amountof the heated air is exhausted out ofthe chamber through the openings inthe vent cap located on top of the ovenand the remaining air recirculateswithin the chamber.

Mechanical convection ovens provide themost efficient means of heat transferas well as the most reproducible testconditions for successive operations.They provide rapid heat-up time forhigh density loads, shortened recoveryperiod in production operations wherethe door is frequently opened and thefiner uniformity for extremely heatsensitive materials.

Gravity convection ovens are idealwhere forced air circulation cannot betolerated and for situations demandinggentle curing, or for long term samplestorage under closely controlled con-ditions.

Precise temperature control and unifor-mity are ideal for many and variedapplications: moisture analysis, oystercondition index evaluation, electronicstesting, determination of total andsuspended solids in sewage, sample imbed-ding for electron microscopy, moisture

Some gravity convection applicationsare: drying powders, curing of facialcosmetic prosthetics, preparation of

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-3-

vapor susceptibilitytrical components atture, protein bound

testing, of elec-elevated tempera-iodine analysis,

accelerating shelf life for cosmeticsand aromatics9 drying of vital cathodepowders curing of acrylics and epoxyresins, determination of milk solids,determination of shrinkage resistance,paraffin imbedding, determining thepotential reactivity of materials,accelerated storage and measurement ofsuspended sediment particles.

In addition to providing mechanicalconvection heat transfer the Models STM80 and STM 135 are supplied with solidstate controllers. These controllerscycle heat in split-second intervalsbased on input from a platinum probehaving a ±0.01°C sensitivity. Whenthis type of control is combined withthe circular pattern of heat flowinside the chamber, precise temperaturecontrol from ambient +5°C to 250°C isachieved.

An LED display indicates temperature anda thumbwheel digital control permitstemperature setpoint selection to l.O°C.The power supply for the LED digitaldisplay is energized with 120 VAC, whichin turn, supplies 9 VDC to the tempera-ture readout PC board.

A pulsing green light indicates whenthe temperature stabilizes at the set-point. For safety, a separeteadustable high limit control turns offthe heater if the selected limit isattained. A blinking red light willindicate this condition.

Recorder jacks are provided on thefront panel to chart the temperaturecycle and maintain permanent records.The recorder jacks supply an output of20 mv/°C and the recorder, selected,should have a range of 0 to 5 volts (0volts corresponds to 0°C, 1 megohmimpedance.

Installation

WARNING: Installation should becompleted by qualified instru-ment personnel, ONLY.

Location: The most uniform operatingconditions and results will be obtainedby placing the oven in an area remotefrom drafts, ventilating outlets,radiators, and other rapidly changingambient conditions.

To assure proper ventilation, allow aminimum of 4 inches of clearance bet-ween the rear top, and sides of ovenand adjacent walls. If two or moreovens are positioned side by side,allow a minimum of 8 inches betweencabinets. The chosen site should be asfree as possible from dust to eliminatemaintence and at the same time extendlife of the controls.

All four legs provided on the bottom ofthe oven are adjustable to compensatefor installation sites that are notlevel.

Electrical Connections: Important(Please Read Carefully)

The following ovens are supplied with acord and plug:

Models STG 40STG 80STM 40STM 80

The power cord of these instruments isequipped with a three-prong (grounding)plug which mates with a standard three-prong (grounding) wall receptacle tominimize the possibility of electricshock hazard from this apparatus. Theuser should have the wall receptacleand circuit checked by a qualified

electrician to make sure the receptacleis properly wired.

WARNING: DO NOT, under any cir-cumstance, cut or remove thethird (ground) prong from thepower cord. DO NOT use a two-prong adapter plug.

The Models STG 145 & STM 135 are fur-nished with an electrical junction boxlocated on the rear of the oven.

In accordance with the NationalElectrical Code, power must be suppliedby permanently wired connections. Aline cord is not supplied. This unitshould be wired by a qualified electri-cian so that proper fusing and servicewires are installed. Ground the ovenelectrically between the mounting screwlocated inside the conduit box and awater pipe, or well grounded conduitsystem.

WARNING: For personal safety,this apparatus must be pro-perly grounded.

Determine the total amount of currentpresently being used by other apparatusconnected to the circuit that will beused for this unit. It is criticalthat the added current demand and otherequipment on the circuit not exceed therating of the fuse or circuit breaker,in use.

Explanation of controls

The controls supplied on the Models STG40, STG 80, STG 145, and STM 40 are asfollows:

“ON - OFF” SWITCH: Controls all powerto the oven. The blower motor onmechanical convection ovens will alwaysbe in operation when the switch is inthe “ON” position.

Dual Thermostat Control Knob: Controlsthe operating temperature of the chamber

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and the safety thermostat. The factoryset temperature differential betweenthe dual thermostats is about 8°C.

“CONTROL/SAFETY” Pilot Lamp: The leftlamp (white) when “ON” indicates heateroperation. The right lamp (red) when"ON” indicates the controlling ther-mostat has failed and the safety ter-mostat has taken control.

The Models STM 80 and STM 135 containthe following controls;

“ON - OFF, LINE” Switch: Controls allpower to the oven and the blower motorwill always be in operation when theswitch is in the the “ON” position.

“HIGH LIMIT” Thermostat: A separateadjustable high limit control turn offthe heater if the selected limit isattained. A pulsing red light, locatedabove the thermostat, will indicatethis condition.

“SET POINT °C”, ThumbWheel DigitalControl: Allows the operator to selectthe desired set point chamber tem-perature by manipulating the levers ofthe thumbwheels. A pulsing green light,located above the thumbwheel, indicateswhen the temperature stabilizes at thesetpoint.

“RECORDER”, jacks : These jacks areprovided to maintain a permanent recordof the chamber temperature cycle. Therecorder jacks supply an output of 20mv/°C and the recorder, selected, shouldhave a range of O to 5 volts (O voltscorresponds to O°C), 1 megohm impedance.

Operation

Fully open the exhaust vent shutter capon top of the cabinet and keep it openat all times. However, when operatingat maximum rated temperature, it may benecessary to turn the shutter captowards the closed position. This willeliminate chamber heat loss.

Insert the shelf supports into holes pro-vided in the shelf support retainers thatare fastened to the side walls of the in-ner chamber. Insert the shelves into theshelf supports and the shelves should bepositioned so they can be withdrawn morethan half way out without falling.

A mercury-in-glass thermometer, tem-perature range of 0 to 250°C, is pro-vided for the following models;

STG 40, STG 80STG 145, and STM 40

and should be inserted through the holelocated in the top of the vent shuttercap. The cap contains 3 tabs that mayhave to be bent inwards to secure thethermometer and maintain it in a verticalposition.

A certified thermometer (not Included) maybe inserted into the shutter cap, as ex-plained above, on the models STM 80 & STM135 to determine chamber temperature and/orto be used later for calibration.

MODELS STG 40, STG 80, STG 145 & STM40. only.

1.

2.

3.

4.

Depress the “ON - OFF” switch to the“ON” position.

Rotate the thermostat control knobclockwise (clockwise rotationincreases chamber temperature) to anarbitrary setting.

Allow the chamber to heat up untilsteady readings are observed on thethermometer. The chamber tem-perature has stabilized when thereis uniform cycling of the controlpilot light.

A desired operating chamber tem-perature as indicated on the ther-mometer, and obtained at aparticular thermostat control knobsetting, should be recorded forfuture reference.

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Before moving from a higher setting toa lower setting, the thermostat controlknob should be turned all the way backto the “Zero” position. The new tem-perature setting should be approachedin a clockwise direction.

NOTE 1: When moving from ahigher setting to a lower one,the safety pilot light may glowfaintly for a short time. Thisis inconsequential and will dis-appear as soon as the new lowertemperature is stabilized.

NOTE 2: Slight vapor dischargemay occur on the initial heatup. This is the dissipation ofthe protective coatings thathave been added to the cabinet.Allow for complete dissipationof the vapors before placingsamples in the chamber.

MODELS STM 80, and STM 135, only.

1.

2.

3.

4.

Depress the “LINE”’ switch to the“ON" position.

Rotate the “HIGH LIMIT” thermostatknob fully clockwise.

Select the desired operating tem-perature by manipulating the leverson the thumbwheel digital control(“SET POINT “C”).

NOTE : The thumbwheel digitalcontrol can be turned to as highas 299°C; however, the ratedcontrollable operating range ofthe oven is 70°C to 225°C.

Allow the chamber to heat up untilsteady readings are observed on theLED temperature display. Thechamber temperature has stabilizedwhen there is uniform cycling of thegreen control pilot light.

NOTE : A slight vapor dischargemay occur on the initial heat

5.

6.

Before setting the “HIGH LIMIT” ter-mostat, the chamber temperature mustbe allowed to stabilize. Dependingon the temperature desired, stabili-zation will require from 15 to 60minutes, maximum.

Set the “HIGH LIMIT” thermostat(which should be at its maximumsetting now fully clockwise), byrotating the knob counterclockwiseuntil the red pilot light turns “ON”.It indicates that the “HIGH LIMIT”thermostat has taken control and thatthe heater has been de-energized.Once this occurs, turn the knob for-ward (clockwise) at least one to twodivisions.

NOTE : This adjustment for the"HIGH LIMIT” thermostat shouldbe done only when the chambertemperature is stabilized (greenpilot light uniformly cycling).

Loading: Although the gravity and mecha-nical convection ovens rely on differentmethods of air circulation, generalloading procedures are applicable toboth types and must be followed. Toinsure that the circulation of heatedair is not restricted in the chamber.

1 .

2.

3.

At least 1" should be left betweenobjects placed on the shelves.

NOTE: With the mechanical con-vection cabinets, objects shouldnot be palced on the shelves insuch a manner as to block themovement of heated air into thechamber from the side diffuserpanels.

The bottom of the chamber must bekept free and clear of objects.

At no time should solid shelves besubstituted for the shelves that areprovided.

-6-

After loading, the time required forthe chamber to recover to the originalstabilized temperature will be directlyrelated to the mass of the load.

WARNING: SAFETY PRECAUTIONS

1. DO NOT place any explosive, combust-ible, or flammable materials in thechamber.

2. DO NOT place sealed containers in thechamber. Sealed containers, filledwith materials, do not provide roomfor expansion and can develop danger-ous vapor pressure as the temperat-ure increases.

3. Avoid spillage of liquids.

4. DO NOT evaporate noxious fumes.

CAUTION: DO NOT store containersfilled with acidic or causticsolutions, as vapors from thesematerials will attack the cham-ber interior and electrical com-ponents, thus voiding the

I warranty.

Servicing

Troubleshooting:

WARNING: Service should be per-formed by qualified service per-. -sonnel. Disconnect the unit fromits electrical source. Removethe shelves and thermometer, ifsupplied. Disconnecting any com-

ponent from the circuit withoutprior removal of the powersource may cause damage to othercircuit components.

Temperature Variance or Fluctuation:

1. Make sure the vent shutter cap isnot closed. Open to maximum.

2. Test unit when empty; if results aresatisfactory, the chamber was improp-erly loaded. Redistribute the load.

3.

4.

5.

6.

Be sure to allow ample time for anempty chamber to stabilize at a tem-perature setting. It could take overone hour to equilibrate, dependingupon the difference between ambientand operating temperatures. The massof the load can also affect stabili-zation time.

Make certain that severe line voltagefluctuations are not occurring.

Make certain that all wire terminalconnections are secure.

Make certain that an intermittentfailure of the switch, thermostat, orwiring has not occurred. Isolate thecause; repair or replace.

Heat Loss: Inspect door gasket to makecertain it fits firmly against cabinet atall points. Replace if damaged, or adjustthe door catch plate. (See Improper DoorClosure).

Improper Door Closure: The plate on thedoor which engages the magnetic catch onthe cabinet is adjustable. Either losenor tighten it to ensure proper doorclosure.

No Heat: If the chamber does not heat,first check the line voltage, circuitbreaker and/or fuses, and all electricalconnections.

Heater Resistance Test Procedure:

WARNING : Disconnect the ovenfrom its power source. l

Refer to the appropriate wiring diagramand the Heater Data Table for resistancevalves at room temperature. Resistanceis measured between terminals 1 and 2located on the terminal block.

Be sure to disconnect at least one heaterlead from the terminal block before tak-ing an ohmmeter reading. If the heater isopen (infinite resistance), it should bereplaced.

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Heater Data Table

Catalog No. Model Heater Voltage Resistance BetweenWattage Heater Leads (ohms)

3147731555

3147831556

STG 40 820

STG 80 1420

3154231557 STG 145 1620

3154031542 STM 40 1150

3155131552 STM 80 1420

3155331554 STM 135 1690

Models STM 80 and STM 135 Only

Overheating: If the heater is "ON” con-tinuously and the green light is notuniformly cycling, the temperature con-tinuously Increases after it hasexceeded the set temperature:

The “HIGH LIMIT“ thermostat willcontrol the oven temperature. When thered light appears, the heater is“OFF”. The temperature will decrease andthermostat will turn the heater back on(green light “ON"). The temperaturewill increase until the thermostatde-energizes the heater again (redlight “ON", green light “OFF”).

If this is the case, replace the tem-perature control PCB on the unit. Ifthe green light is “ON” continuously,check:

1.2.3.4.

Sensor (it may not be hooked up).Triac assembly (it may be shorted).PC Board.Thumbwheel switch.

120 17.5230 70.0

120 10.0230 40.0

120 8.5

230 34.0

120 12.5230 50.0

120 10.0

230 40.0

120 8.5

230 34.0

Sensor Specifications

a. Resistance of sensor:100.ohms ±.2 ohm @ 0°C138.50 ohms ±0.3 ohm @ 100°C

b. Operating temperature range: -20°Cto +250°C

c. Thermal time constant @ 2 ft./sec.:2.5 sec. Max.

d. Maximum operating current: 20 mA

e. Resistance between leads and S.S.tubing: 100 megohms or greater

Sensor Resistance Test and/or Replacement:

CAUTION: To prevent P.C. boardcomponent damage, the instrumentmust be disconnected from itselectrical source before discon-necting the sensor from the P.Cboard.

1. Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the tem-perature control PCB , (A1OO).

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2. Disconnect the sensor plug (J-102)from the PCB.

Test Resistance of Sensor:100.0 ohms ±0.2 ohm at O°C138.5 ohms ±0.3 ohm at 100°C

3. If sensor replacement is necessary,remove all screws that fasten therear panel to the back of the ovento gain access to the sensor leads.

4. Remove the sensor from the cliplocated at the top of the innerchamber then slip the sensor throughthe bottom of the oven.

5* Replace the sensor reversing thesteps shown above. See figure belowfor proper sensor location.

6. See page 12 for recalibration proce-dure.

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-10--

WARNING : Triac testing and/orreplacement should be completedby a qualified electronic ser-viceperson and extreme cautionshould be exercised during triactesting as line voltage is pre-sent in the control compartment.

If there is no heat when “SET POINT oC”thumbwheel is set at 35°C or higher, orif there is constant heat even when the“SET POINT oC thumbwheel is dialedbelow room temperature, there is apossibility that the triac has malfunc-tioned. When the triac is energized,it will read an output of 1 volt acrossMT1 and MT2. If the triac is de-energized, it reads 115 volts acrossMTI and MT2.

To gain access to the triac it will benecessary to lay the oven on its doorand remove the sheet metal panel whichis fastened to the bottom of the oven.

Install triac assembly such that gateterminal (smallest tab) is in the lowerleft-hand corner and is connected to theviolet wire. The MTl connection shouldbe hooked up to the red lead wire, andthe MT2 conneciton should be hooked upto the grey lead wire.

NOTE: The triac in eachmay differ as shown infiguration #l or

unitcon-#2

Thumbwheel Switch Test and/orReplacement:

(Models STM 80 and STM 135)

WARNING : Disconnect the ovenfrom its power source.

1. Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the rear ofthe switch.

2. The thumbwheel switch is fastenedto the rear of the panel by 4 springtabs and is connected to the controlPCB by means of a ribbon cable.

3. Remove the ribbon cable from theSWitch .

4. Check continuity between common (C)and pin 1, 2, 4, or 8 for eachmodule (3 modules/switch) using theTruth Table shown below:

Ten Position, binary coded decimal

Example: Temperature settingswitch , "Set Point °C;

127

Continuity should be between commonpin 1 (lst Module - dial setting of

Continuity should be between commonpin 2 (2nd Module - dial setting of

on

and1)

and2)

Continuity should be between common andpins 1, 2, and 4 (3rd Module - dialsetting of 7)

Temperature Readout PCB (A200)Malfunctioninq.

Sympton 1. Digits do not register.

Remedy 1. Measure voltage supply bet-ween (J217) and (J218, J213both grounded together).Voltage should be 4.8 to 5.1VDC and if voltmeter readingis zero, check connectionsbetween Temperature ControlPCB and Temperature ReadoutPCB. If reading is correctreplace Temperature ReadoutPCB.

Symptom 2. One segment of each LED isnot lit.

or

If one segment on one LED isnot lit.

Remedy 2. Replace Temperature ReadoutPCB .

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Temperature Control PCB (A100)Replacement:

1.

2.

3.

4.

5.

Disconnect the oven from its powersource.

Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the electri-cal components.

Pinch the 4 plastic tabs on eachcorner of the PCB and carefully liftthe board straight up.

Replace the PCB using extreme carenot to break the electrical connec-tions or plastic prongs.

See below for recalibration proce-dures.

Temperature Readout PCB (A200)Replacement:

1.

2.

3.

Disconnect the oven from its powersource.

Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the electri-cal components.

Carefully remove the PCB by liftingstraight up and out of theTemperature Control PCB.

CALIBRATION OF TEMPERATURE CONTROLLERPCB (A1OO) AND TEMPERATURE READOUT PCB(A200)

WARNING : PCB calibration shouldbe completed by a qualified elec-tronic service person and extremecaution should be exercised dur-ing temperature calibration asline voltage is present in thecontrol compartment.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

Immerse a certified thermometer (notsupplied) into a container filledwith glycol and place the containerin approximately the center of thechamber.

Open the air exhaust cap.

Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the elctricalcomponents.

Replace the RTD sensor with a decaderesistor box.

Rotate the “High Limit” thermostatknob fully clockwise.

Connect a voltmeter with a range ofO to 5000 mv to the “Recorder” jacks

Dial 000 on the “Set Point°C”thumbwheel digital control.

Dial 100.00 ohms on the decaderesistor box.

Adjust the “ZERO” trimpot on theTemperature Control PCB until thevolt meter reads 0.0 mv ±4 mv.

The temperature display should read000; if not, adjust the “ZERO” trim-pot on the Temperature Readout PCB.

Adjust the “LOW HEAT” trimpot, onthe Temperature Controller PCB, forminimum heat output. (green pilotlamp should be “off” 80% of thetime.)

Dial 225°C on the "Set Point “C”thumbwheel digital control.

Dial 185.03 ohms on the decaderesistor box.

Adjust the “HIGH HEAT” trimpot, onthe Temperature Control PCB, untilthe heat out put is on more than 50%(green pilot lamp should be “on”more than 50% of the time).

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15. The voltmeter connected to the“Recorder” jacks should read 4500±4 mv; if not, adjust the "Scaletrimpot on the TemperatureController PCB.

16. The temperature display shouldindicate 225; if no, adjust the“GAIN" trimpot on the TemperatureReadout PCB.

17. Remove the decade resistor box con-nections and replace the RTDsensor.

18. Continue to operate the oven at225°C. After the oven temperaturehas stabilized, for 30 minutes,

adjust the “HIGH HEAT” trimpot, Ifnecessary, to read exactly 225°C onthe temperature display.

19. The “Recorder” jacks output shouldbe 4.50 volts. If not, adjust the"SCALE" trimpot on the TemperatureController PCB.

20. The temperature display should indi-cate 225°C. If not, adjust the“GAIN” trimpot on the TemperatureReadout PCB.

21. Reset 100°C on the thumbwheel digi-tal control. The indicated tem-perature display should be 100 ±1°C.

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- 1 4 -

MODELS STG 40, STG 80, STG 145, AND STM40, ONLY.

Loss of Heat Control: If at any timethe safety thermostat assumes controlof the chamber temperature, replace thethermostat.

WARNING: Replacement of the fol-lowing components should be com-pleted by a qualified electronicservice person, and the ovenshould be disconnected from itselectrical power source.

“ON - OFF” Switch Replacement:

1. Remove 4 screws that fasten the

2.

3.

4.

5.

control panel to the oven to gainaccess to the electrical components.

Tag and identify the lead wires withrespect to their relative positionsfor ease of replacement.

Remove the wire leads from theswitch .

Compress the spring clips that fastenthe switch to the panel and push theswitch outward from the back of thepanel.

Press the replacement switch into thepanel and connect the wire leads.

Pilot Lamp Replacement:

1.

2.

3.

4.

Remove 4 screws that fasten thecontrol panel to the oven to gainaccess to the electrical components.

Tag and identify the lead wires withrespect to their relative positionsfor the ease of replacement.

Remove the wire leads from the pilotlamp .

The pilot lamps on the Models STM 80& 135 are fastened to the rear of thepanel, with a speed nut that must beremoved before the lamp can beremoved.

5.

6.

7.

Push the pilot lamp outward from theback of the panel.

Press the replacement lamp into theopening and replace speed nut, ifsupplied. On units with dual pilotlamps, the red portion should be onthe right.

Attach the appropriate wires to thepilot lamp.

Dual Thermostat Assembly Replacement:

Gravity Convection Ovens(Models STG 40, STG 80 & STG 145)

1.

2.

3.

4.

5.

6.

7.

8.

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Remove 2 screws that fasten the thermo-stat bulbs and bulb retainer to the dif-fuser panel. Bend the thermostat capil-laries towards the top of the chamber.

Remove 2 screws that fasten the dif-fuser panel brackets to the sidewalls.Remove the diffuser panel from the bot-tom chamberand carefully slide the bulbsthrought the holes in the diffuserpanel.

Loosen the set screws that fastenthe control knob to the shaft of thethermostat, then remove the knob.

Remove 4 screws that fasten thecontrol panel to the oven to gainaccess to the electrical components.

Tag and identify the lead wires withrespect to their relative positionsfor the case of ‘replacement.

Disconnect the wire leads from thethermostat.

Guide the thermostat bulbs out of thechamber and out through the bottom ofthe oven.

Replace the thermostat, reversing theabove procedure.

CAUTION: DO Not crimp orsharply bend the capillariesas this will obstruct the flowof the hydraulic operatingmedia causing erroneous ther-mostat control and shorten thelife of the thermostat.

Mechanical Convection Ovens(Model STM 40, Only)

1.

2.

3.

4.

5.

6.

7.

8.

To gain access to the thermostatbulbs , remove 2 screws that fastenthe diffuser panel brackets to theside walls then remove the diffuserpanel from the bottom of thechamber.

Disconnect the heater assembly fromthe bus bars and lift it out of thechamber.

Loosen the set screws that fastenthe control knob to the shaft of thethermostat, then remove the knob.

Remove 4 screws that fasten thecontrol panel to the oven to gainaccess to the electrical components.

Tag and identify the lead wires withrespect to their relative postionsfor the ease of replacement.

Disconnect the wire leads from thethermostat.

Remove the thermostat sensingfrom the retaining clips andthe bulbs out of the chamber.

bulbsguide

Replace the thermostat reversing theabove procedure.

1.

2.

CAUTION: Do Not crimp or sharplybend the capillaries as thiswill obstruct the flow of thehydraulic operating mediacausing erroneous thermostatcontrol and shorten the life ofthe thermostat. Also , be surethere is no contact between thecapillaries and heater.

Heater Replacement:

On the gravity convection ovens(Models STG 40, STG 80, & STG 145),remove 2 screws that fasten boththermostat bulbs and the retainingclips to the bottom diffuser panel inthe chamber.

NOTE: On the mechanical con-vection ovens (Models STM 40,STM 80, & STM 135) the ther-mostat bulbs are beneath thebottom diffuser panel and willnot have to be removed.

Remove the bottom diffuser panel byremoving its retaining screws. Workthe thermostat bulbs (gravity ovensonly) upright and lift the panel outof the chamber, carefully sliding thebulbs through it, while noting thehole through which the bulbs wereoriginally placed.

CAUTION: Do Not crimp or sharp-ly bend the thermostat capillar-ies as it will obstruct the flowof the hydraulic operating mediacausing erroneous thermostatcontrol and shorten the life ofthe thermostat.

3. Disconnect the heater from the busbars. (Do not allow the bus bars toslip down through the porcelain insu-lators or it will be necessary toremove the control panel to push themback.)chamber.reconnect

Lift the- heater from theInstall the new heater andthe bus bars.

-16-

4.

5.

Work the two thermostat bulbs(gravity ovens only) through thehole in the bottom diffuser panel.Replace the panel and secure it.

Carefully work the bulbs back intoplace and secure them with theretaining clips.

Motor Replacement (Models STM 40, STM80, & STM 135):

1.

2.

3.

4.

5.

6.

7.

8.

Remove 2 screws that fasten thediffuser panel to the side wallsthen remove the panel.

Disconnect the heater from the busbars. (Do not allow the bus bars toslip down through the porcelain in-sulators or it will be necessary toremove the control panel to push themback.) Lift the heater from thechamber.

Remove the blower scroll assembly byremoving screws that fasten it inplace.

Loosen the set screw that fasten theblower wheel to the motor shaft thenremove the blower.

Lay the cabinet on its back. Besure the line cord, if supplied, canhang free and is not pinched againstthe back of the cabinet and that thedoors are closed.

Remove perforated panel on the bot-tom of the cabinet. Disconnect wireleads of the motor.

Remove the motor mounting screws andremove the motor.

Install the new motor so that itsshaft engaes the blower wheel. Makesure that the set screw that locksthe blower wheel to the flat on themotor shaft is fastened securely.

NOTE: Be sure that when theblower wheel is secured to themotor shaft, the wheel is cen-tered vertically between thepanels. This will assure its"free spin". If not centered,the wheel may touch the panelsand not rotate freely.

Proceed in reassembling the unit by per-forming the reverse of the above steps.

"High Limit Thermostat(Models STM 80 & STM 135)

1.

2.

3.

4.

5.

6.

7.

8.

Replacement:

Loosen the set screw that fasten thecontrol knob to the thermostat shiftand then remove the knob.

Remove 2 flat head screws, locatedbehind the control knob (removed).

Remove 4 screws that fasten thecontrol panel to the front of theoven to gain access to the “HighLimit” thermostat.

To gain access to the thermostat bulband heater, remove the diffuser panelwhich is fastened with 2 screws tothe side walls.

Disconnect the heater assembly fromthe bus bars and lift it out of thechamber.

Remove the screws that fasten theblower scroll to the bottom of thechamber and remove the scroll.

Disconnect the electrical leads fromthe thermostat and remove the ther-mostat bulb from the retaining clips.(The clips may have to be slightlytwisted.) Guide the thermostat outof the bottom of the oven.

Install the new thermostat, reversingthe above procedure.

-17-

CAUTION: Do Not crimp orsharply bend the capillary asthis will obstruct the flow ofthe hydraulic operating mediacausing erroneous thermostatcontrol and shorten the life ofthe thermostat. Also, be surethere is no contact between thecapillaries and heater.

Maintenance (All Models):

Cleaning Exterior and Interior:

A mild solution of soap and water or

bicarbonate of soda (1 tbsp/gallon ofwater) is recommended.

WARNING: Disconnect the ovenfrom its eletrical power source.

Motor Lubrication:

(On the mechanical convection ovens) A.ball bearing fan-cooled permanentlylubricated motor is use. Lubricationshould not be necessary for the life ofthe motor.

-18-

PRECISION INSTRUCTION MANUAL

PART LIST

MOD. NO. STG 40 STG 80 STG 145 STM 40 STM 80 STM 135CAT. NO. 31477 | 31555 31478 | 31556 31542 | 31557 31540 | 31541 31551 | 31552 31553 | 31554

ITEM SYMBOL DESCRIPTION PART NUMBER

1 A100 PCB, TEMPERATURE CONTROL N/A N/A N/A N/A 00803601 | 00803602 00803601 | 00803602

2 A200 PCB, TEMPERATURE READOUT N/A N/A N/A N/A 00803901 00803901

3 A10 TRIAC ASSEMBLY N/A N/A N/A N/A 00870301 00870301

4 DS1 LAMP, PILOT (GREEN) N/A N/A N/A N/A 234190 | 234189 234190 | 234189

5 BARRIER (FISH PAPER) N/A N/A N/A N/A 00843701 00843701

6 DS2 LAMP, PILOT (RED) N/A N/A N/A N/A 234174 | 234175 234174 | 234175

7 DS3 LAMP, DUAL PILOT (WHITE & RED) 234147 | 247148 234147 | 247148 234147 | 247148 247147 | 247148 N/A N/A

8 RTD1 SENSOR, TEMPERATURE N/A N/A N/A N/A 00870601 00870601

9 HR1 HEATER 247274 247275 247277 247279 247276 247278

10 S1 SWITCH, LINE 240304 240304 240304 240304 240304 240304

11 S2 THERMOSTAT, SAFETY N/A N/A N/A N/A 239091 239091

12 KNOB,SAFETY THERMOSTAT (0-9) N/A N/A N/A N/A 220159 220159

13 S3 SWITCH, THUMBWHEEL N/A N/A N/A N/A 00878701 00878701

14 BEZEL AND FILTER ASSEMBLY N/A N/A N/A N/A 539817 539817

15 S4 THERMOSTAT, DUAL 239097 239097 239097 239097 N/A N/A

16 KNOB, DUAL THERMOSTAT 220097 220097 220097 220097 N/A N/A

17 B1 MOTOR, BLOWER N/A N/A N/A 538997 | 538998 538997 | 538998 538997 | 538998

18 BLOWER, WHEEL N/A N/A N/A 257024 257024 257024

19 J2 JACK, RECORDER (BLACK) N/A N/A N/A N/A 236165 236165

20 J3 JACK, RECORDER (RED) N/A N/A N/A N/A 236164 236164

21 INSULATOR, POERCELAIN (BUS BAR) 250087 250087 250162 250161 250161 250161

22 SHELF (2 SUPPLIED) 535093 535096 535098 535092 535095 535097

23 SUPPORT, SHELF (4 SUPPLIED) 536796 536796 536798 536796 536796 536798

24 LEVELLER SCREW (4 SUPPLIED) 241048 241048 241048 241048 241048 241048

25 CAP, LEVELLER (4 SUPPLIED) 241047 241047 241047 241047 241047 241047

26 CAP SHUTTER VENT 535187 535187 535187 535187 535187 535187

27 THERMOMETER 307055 307055 307055 307055 N/A N/A

28 CATCH, MAGNETIC (MID. ON CABINET) 270052 270052 270052 270052 270052 270052

29 LEAF, TOP HINGE (MID. ON CABINET) 535085 535085 535085 535085 535085 535085

30 LEAF, BOTTOM HINGE (MID. ON CABINET) 535088 535088 535088 535088 535088 535088

31 DOOR ASSEMBLY 00441801 00441802 00441803 00441801 00441805 00441806

32 HINGE PIN (2 REQ.) 535086 535086 535086 535086 535086 835086

33 SPRING (2 REQ.) 535180 535180 535180 535180 535180 535180

34 STRIKE PLATE 535450 535450 535450 535450 535450 535450

35 GASKET, SILICONE 167319 (5 FT) 167319 (6-3/4 FT) 167319 (5 FT) 167319 (6-3/4 FT) 167319 (7-3/4)

36 HANDLE 00450701 00450702 00450702 00450701 00450702 00450702

37 CORD AND PLUG 333015 | 353017 353015 | 353017 N/A 353015 | 353017 353015 | 353017 N/A

19

-20-

-21-

-22-

-23-

-24-

Precision @ Instruction Manual

Exclusive Precision Warranty

PRECISION SCIENTIFIC warrants its pro-ducts against defects in mater 1 or inworkmanship, when used underappropriate conditions and in accor-dance with appropriate operatinginstructions for a period of no lessthan one (1) year from the date ofdelivery of the products.

Sole obligation of PRECISION SCIENTIFICshall be to repair or replace at ouroption, FOB factory or locally, withoutcharge, any part(s) that prove defec-tive within the warranty period, pro-vided the customer notifies PRECISIONSCIENTIFIC promptly and in writing ofany such defect. Compensation forlabor by other than PRECISIONSCIENTIFIC employees will not be ourobligation. Part(s) replacement doesnot constitute an extension of the ori-ginal warranty period.

PRECISION SCIENTIFIC MARES NOWARRANTY OF MERCHANTABILITY ,FITNESS FOR A PARTICULARPURPOSE, OR ANY OTHER WARRANTY,EXPRESSED OR IMPLIED, AS TO THEDESIGN, SALE, INSTALLATION, ORUSE OF ITS PRODUCTS, AND SHALLNOT BE LIABLE FOR CONSEQUENTIALDAMAGES RESULTING FROM THE USEOF ITS PRODUCTS.

PRECISION SCIENTIFIC will not assumeresponsibility for unauthorized repairsor failure as a result of unauthorizedproduct modifications, or for repairs,replacements, or modifications negli-gently or otherwise improperly made orperformed by persons other thanPRECISION SCIENTIFIC employees orauthorized representatives.

While our personnel are available toadvise customers concerning generalapplications of all manufactured pro-ducts , oral representations are notwarranties with respect to particularapplications and should not be reliedupon if inconsistent with productspecifications or the terms statedherein.

In any event, the terms and conditionscontained in PRECISION SCIENTIFICformal sales contracts shall becontrolling; and any changes must bein writing and signed by an authorizedexecutive of PRECISION SCIENTIFIC.

All defective components will be re-placed without charge one (1) year fromthe date of delivery. There will be nocharge for labor if the apparatus isreturned to the factory prepaid.

Conditions and qualifications of thewarranty statement shall prevail at alltimes.

Precision is a registered trademark of Precision Scientific Inc.

TM 10-6640-218-13&P

APPENDIX A

REFERENCES

A–1. Scope. This appendix contains all forms, pamphlets and technical manuals referenced in boththe Air mobile and Semitrailer mounted Laboratories.

A–2. Forms.

Recommended Changes to Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DA Form 2028DA Form 2028-2

Quality Deficiency Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SF 368Equipment Inspection and Maintenance Work Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . DA Form 2404Hand Receipts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DA Form 2062

A-3. Field Manuals.

Petroleum Testing Facilities:Laboratories and Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM 10-72

Inspecting and Testing Petroleum Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM 10-70ASTM Test Method Supplement to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM 10-92C1/C2

A-4. Technical Manuals.

Atlas-Copco Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-4310-392-13&PAlcor Jet Fuel Thermal Oxidation Tester Operating

and Maintenance Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6635-210-13&PBacharach Gas Alarm and Calibration Data . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6665-297-13&PBrother Portable Typewriter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10–7430-218-13&PChemtrix Field Ph Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-237-13&PElkay Manufacturing 30 GPH Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-4130-240-13&PEmcee MicroSeparometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-222-13&PFoxboro Pressure Recording Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6685-365-13&PGammon Aqua Glo Water Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-221-13&PGammon Mini Monitor Fuel Sampling Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-230-13&PJelrus Burn-Out Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-231-13&PKoehler Cleveland Open Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-236-13&PKoehler Cloud and Pow Point Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-238-13&PKoehler Copper Strip Corrosion Bomb Bath . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-220-13&PKoeller Distillation Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-233-13&PKoeller Dropping Point Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6635-211–13&PKoehler Electric Pensky–Matiins Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-231-13&PKoehler Foaming Characteristics Determination Apparatus . . . . . . . . . . . . . TM 10-6640-228-13&PKoehler Kinematic Viscosity Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-239-13&PKoehler Tag Closed Cup Flash Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-235-13&PLabLine Explosion Proof Refrigerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-219-13&PLily Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-234-13&PMillipore Old 39 Filter Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-225-13&PMillipore Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-217–13&POhaus Harvard Trip Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6670-278-13&PPrecision Gas-Oil Distillation Test Equipment . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-219-13&PPrecision General Purpose Water Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-229-13&P

A-1

TM 10-6640-218-13&P

Precision High Temperature Bronze Block Gum Bath . . . . . . . . . . . . . . . . TM 10-6630-234-13&PPrecision General Purpose Ovens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-218-13&PPrecision Heater Instruction Manual and Parts List . . . . . . . . . . . . . . . . . . TM 10-6640-223-13&PPrecision Oxidation Stability Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-232-13&PPrecision Pensky–Martens Flash Testers . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6630-231-13&PPrecision Reid Vapor Pressure Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-226-13&PPrecision Slo–Speed Stirrer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-224-13&PPrecision Universal Centrifuge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-230-13&Pprecision universal Penetrometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-228 -13&PSargent–Welch Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-4310-391-13&PSartorious Analytical Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6670-277-13&PScotsman Cuber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-227-13&PSoltec VOM–Multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6625-3127-13&PTeel Self–Priming Centrifugal Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-6640-217-13&PTeel Submersible Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-4320–320–13&PTexas instrument TI–5030II Calculator . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 10-7420-210-13&P

A–5. Pamphlets.

The Army Maintenance Management System (TAMMS) . . . . . . . . . . . . . . . . . . . . . DA Pam 738–750

A-6. Miscellaneous Publications.

The Army integrated Publishing and Printing Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AR25-30Laboratory, Airmobile, Aviation Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIL-L-52733A(ME)Apparatus, Instruments, Chemicals, Furniture, and Supplies for Industrial,

Clinical, College and Government Laboratories . . . . . . . . . Fisher Scientific Laboratories CatalogPetroleum–Petrochemical Testing Equipment . . . . . . . . . . . . . . . . . . . . . Precision Scientific Catalog

A-2

TM 10-6640-218-13&P

APPENDIX B

MAINTENANCE ALLOCATION CHART

B-1. General.

Section I. INTRODUCTION

a. This section provides a general explanation of all maintenance and repair functions authorized atvarious maintenance categories.

b. The Maintenance Allocation Chart (MAC) in Section II designates overall authority andresponsibility for the performance of maintenance functions on the identified end item or component. Theapplication of the maintenance functions to the end item or component will be consistent with thecapacities and capabilities of the designated maintenance categories.

c. Section Ill lists the tools and test equipment (both special tools and common tool sets) required foreach maintenance function as referenced from Section II.

d. Section IV contains supplemental instructions and explanatory notes for a particular maintenancefunction.

B-2. Maintenance Functions. Maintenance functions will be limited to and defined as follows:

a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/orelectrical characteristics with established standards through examination (e.g., by sight, sound, or feel).

b. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electricalcharacteristics of an item and comparing those characteristics with prescribed standards.

C. Service. Operations required periodically to keep an item in proper operating condition, i.e., toclean (includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel,lubricants, chemical fluids, or gases.

d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position,or by setting the operating characteristics to specified parameters.

e. Align. To adjust specified variable elements of an item to bring about optimum or desiredperformance.

f. Calibrate. TO determine and cause corrections to be made or to be adjusted on instruments ortest, measuring, and diagnostic equipments used in precision measurement. Consists of comparisons oftwo instruments, one of which is a certified standard of knob accuracy, to detect and adjust anydiscrepancy in the accuracy of the instrument being compared.

g. Remove/Install. To remove and install the same item when required to perform service or othermaintenance functions. Install may be the act of emplacing, seating, or fixing into position a spare, repairpart, or module (component or assembly) in a manner to allow the proper functioning of an equipment orsystem.

h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.“Replace” is authorized by the MAC and is shown as the third position code of the SMR code.

B-1

TM 10-6640-218-13&P

i. Repair. The application of maintenance services,1including fault location/troubleshooting,2

removal/installation, and disassembly/assembly procedures3 and maintenance actions4 to identifytroubles and restore serviceability to an item by correcting specific damage, fault, malfunction, or failurein a part, subassembly, module (component or assembly), end item, or system.

j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completelyserviceable/operational condition as required by maintenance standards in appropriate technicalpublications (i.e, DMWR). Overhaul is normally the highest degree of maintenance performed by theArmy. Overhaul does not normally return an item to like–new condition.

k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceableequipment to a like–new condition in accordance with original manufacturing standards. Rebuild is thehighest degree of materiel maintenance applied to Army equipment. The rebuild operation includes theact of returning to zero those age measurements (hours/miles, etc.) considered in classifying Armyequipment/components.

B-3. Explanation Of Columns In The MAC, Section II.

a. Column I. Group Number. Column 1 lists functional group code numbers, the purpose of which isto identify maintenance significant components, assemblies, subassemblies, and modules with the nexthigher assembly. End item group number shall be “00.”

d. Column 4. Maintenance Category. Column 4 specifies, by the listing of a work time figure in theappropriate subcolumn(s), the category of maintenance authorized to perform the function listed incolumn 3. This figure represents the active time required to perform that maintenance function at theindicated category of maintenance. If the number or complexity of the tasks within the listed maintenancefunction vary at different maintenance categories, appropriate work time figures will be shown for eachcategory. The work time figure represents the average time required to restore an item (assembly,subassembly, component, module, end item, or system) to a serviceable condition under typical fieldoperating conditions. This time includes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location time, and quality assurance/quality control time in additionto the time required to perform the specific tasks identified for the maintenance functions authorized in themaintenance allocation chart. The symbol designations for the various maintenance categories are asfollows:

B-2

B-3

TM 10-6640-218-13&P

Operator/CrewUnit MaintenanceDirect Support MaintenanceGeneral Support Maintenance

D . . . . . . . . . . . . . . . . . . . . . Depot Maintenance

e. Column 5. ToolS and Equipment. Column 5 specifies, by code, those common tool sets (notindividual tools) and special tools, TMDE, and support equipment required to perform the designatedfunction.

f. Column 6. Remarks. This column shall, when applicable, contain a letter code, in alphabeticorder, which shall be keyed to the remarks contained in section IV.

B-4. Explanation Of Columns In Tool And Test Equipment Requirements, Section III.

a. Column I. Reference Code. The tool and test equipment reference code correlates with a codeused in the MAC, section II, column 5.

b. , The lowest category of maintenance authorized to use the toolor test equipment.

c.

d.

e.

B-5.

a.

b.

Column 3. Nomenclature. Name or identification of the tool or test equipment.

Column 4. National Stock Number. The National stock number of the tool or test equipment.

Column 5. Tool Number. The manufacturer’s part number.

Explanation Of Columns In Remarks, Section IV.

Column 1. Reference Code. The code recorded in column 6, Section II.

Column 2.Remarks. This column lists information pertinent to the maintenance function beingperformed as indicated in the MAC, section II.

Section II. MAINTENANCE ALLOCATION CHART

(1) (2)GROUP COMPONENT/

NUMBER ASSEMBLY

01 OVEN, GENERALPURPOSE

(3)MAINTENANCE

FUNCTION

INSPECTTESTREPLACEREPAIR

1

TM10-6640-13&PSECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

MAINTENANCE ALLOCATION CHART(1) (2) (3) (4) (5)TOOL/TESTEQUIP. MAINTENANCE NOMENCLATURE NSN TOOLREF CODE CATEGORY NUMBER

1 O,F TOOL KIT, GENERAL AUTOMOTIVE 5180-00-177-7033 (50980)SC 5180-90-CL-N26

SECTION IV.REMARKS

NOT APPLICABLE

B-4

Section III.

TM 10-6640-218-13&P

APPENDIX C

COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LISTS

Section I. INTRODUCTION

C-1. Scope.

This appendix lists components of end item and basic issue items for the General Purpose Oven to helpyou inventory items required for safe and efficient operation.

C-2. General.

The Components of End Item and Basic Issue Items Lists are divided into the following sections:

a. Section II. Components of End Item. This listing is for informational purposes only, and is notauthority to requisition replacements. These items are part of the end item, but are removed andseparately packaged for transportation or shipment. As part of the end item, these items must be with theend item whenever it is issued or transferred between property accounts. Illustrations are furnished toassist you in identifying the items.

C-3. Explanation of Columns.

The following provides an explanation of columns found in the tabular listings:

a. (1) - Illustration Number (Illus Number). This column indicatesillustration in which the item is shown.

the number of the

b. Column (2) - National Stock Number. Indicates the National stock number assigned to the itemand will be used for requisitioning purposes.

c. Column (3) - Description. Indicates the Federal item name and, if required, a minimumdescription to identify and locate the item. The last line for each item indicates the CAGEC (inparentheses) followed by the part number.

d. Column (4) - Unit of Measure (U/M).r Indicates the measure used in performing the actualoperational/maintenance function. This measure is expressed by a two-character alphabeticalabbreviation (e.g., ea, in, pr).

e. Column (5) – Quantituy required (QTY RQR). Indicates the quantity of the item authorized to beused with/on the equipment.

C-1

TM10-6640-218-13&P

SECTION II. COMPONENTS OF END ITEM(1) (2) (3) (4) (5)

NATIONAL DESCRIPTION USABLEILLUS NUMBER CAGEC AND PART NUMBER ON CODE U/M QTY.

6640-00-299-8689 DISH, CULTURE, PETRI: TOP AND BOTTOM PG 1COMPLETE: U/W BACTERIAL FILTERING DISK;DISPOSABLE; 100'S; FOR ASTM 2276;MIL-D-36425

SECTION III. BASIC ISSUE ITEMSNOT APPLICABLE

C-2

TM 10-6640-218-13&P

APPENDIX D

ADDITIONAL AUTHORIZATION LIST

NOT APPLICABLE

D-1/( D-2 Blank)

TM 10-6640-218-13&P

APPENDIX E

EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST

Section I. INTRODUCTION

E-1. Scope. This listing is for informational purposes only and is not authority to requisition the listeditems. These items are authorized to you by CTA 50-970, Expendable/Durable Items (except medical,class V, repair parts, and heraldic items).

E-2. Explanation of Columns.

a. Column (1) - Item Number. This number is assigned to the entry in the listing and is referenced inthe narrative instructions to identify the material (e.g., Use cleaning compound, item 5, appendix C).

b. Column (2) - Level. This column identifies the lowest level of maintenance that requires the listeditem.

C - Operator/CrewO - Unit MaintenanceF - Direct Support MaintenanceH - General Support Maintenance

c. Column (3) - National Stock Number. This is the National stock number assigned to the item; useit to request or requisition the item.

d. Column (4) - Description. Indicates the Federal item name, and, if required, a description toidentify the item. The last line for each item indicates the Commercial and Government Entity Code(CAGEC) in parentheses followed by the part number.

e. Column (5) - Unit of Measure (U/M). Indicates the measure used in performing the actualmaintenance function. This measure is expressed by a two-character alphabetical abbreviation (e.g.,EA, IN, PR). If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that willsatisfy your requirements.

Section II. EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST

(1) (2) (3) (4) (5)Item National Stock Description U/M

Number Level Number

C 6640-00-985-2099 DISK, FILTERING, MICROPOROUS: HDAEROSOL AND HYDROSOL; 25 MM DIA;100’S; FOR ASTM TEST D-2276 (08071)HAWP-025-00

E-1/(E-2 Blank)

TM 10-6640-218-13&P

By Order of the Secretary of the Army:CARL E. VUONO

General, United States ArmyChief of Staff

Official:

THOMAS F. SIKORABrigadier General, United States Army

The Adjutant General

DISTRIBUTION:To be distributed in accordance with DA Form 12-21 A, Operator, Unit and Direct SupportMaintenance requirements for Laboratory, Air Mobile, Aviation Fuel and Laboratory,Petroleum, MTD

* U.S. GOVERNMENT PRINTING OFFICE: 1991 554-123/20142

PIN:046572-000

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