magnetic level gauges

8/12/2019 Magnetic Level Gauges

1/23

BONETTIBONETTI

Bulletin B 98 - 5 - E

BONTBONT

Magnetic

Level Gauges

Remote Reading

System

Magnetic

Level Switches3300


2/23BONT2

In Milan, in 1905 Cesare Bonetti opened a small shopand manufactured to order any cocks for the local

requirement.

In the early twenties this small firm took on a newindustrial look and moved towards production and

trade of industrial valves only.

Bonetti is, by this time, becoming a well-known com-pany for production of piston valves, sleeve-packed

cocks and glass level gauges.Later the production range, bearing the BONT registe-

red trade-mark includes the new valves for high pres-

sure and temperature meeting the strictest requi-rements of the most advanced technology, besides

double-sealing valves, bellows valves, diaphragm val-ves, magnetic level gauges.

After two enlargements the company in 1969 moves to

the new Garbagnate Milanese Works where Bonetti's

typical trend for research, development and designaccuracy has more opportunity to expand.

Certification according to ISO 9001 / UNI EN 29001.

Facilities:

Enclosed surface 66,000 sq.m

Offices building (with car parkingbelow) for three stories 2,200 sq.m

Facilities building (mess-hall, locker

rooms, sanitary department, etc.)

for three stories 2,000 sq.m

Manufacturing shed (including

Production Department and

general Facilities) 17,500 sq.m

INDEX Page Page

Operating Principle ...................................................3

Design ........................................................................3

Applications...............................................................3

Materials.....................................................................3

Operating Conditions ...............................................3

Types and Classes ....................................................3

Material Schedules....................................................4

C to C Distance..........................................................4

Visible Length............................................................4

Connections ..............................................................4

Accessories ............................................................4-5

Startup and Stop .......................................................5

Servicing ....................................................................5

Enquiries and Purchase Orders ..............................5

Magnetic Level Gauges

of Stainless Steel

for PN 10/40 - 400...............................................6-7

of Synthetic Polymers ............................................8

of Stainless Steel

PTFE lined .............................................................9

Series MAG 210, for Water Steam

up to 210 bar pressure....................................10-11

type MAG-RDR

for Remote Direct Reading...................................12 with Float immerse in Vessel ...............................13

Remote Reading System

type MST...................................................................14

Sensing Elements................................................15

type MST.X ..........................................................16

type MST.XX........................................................16

type MST.A ..........................................................17

type MST.B ..........................................................17

type MST.C ..........................................................18

Magnetic Level Switches

type MAG-LIS............................................................19

FIGURE NUMBER INDEX

Fig. Page

3322 06

3323 08

3324 08

3325 09

3326 07

3327 10

3330 19

Fig. Page

3303 4

3304 4

3305 5

3306 5

3307 5

3308 5

3321 6

Fig. Page

3331 09

3332 12

3333 13

3336 16

3337 16

3338 17

3339 17

Fig. Page

3340 18

3341 14

3342 03

3343 7-10

3344 15

3345 11


3/233BONT

Magnetic Level GaugesBONT

The operation of theBONT magnetic level

gauge is based on some elementary physical principles:The principle whereby the liquid in communicating vessels isalways at the same level,

Archimedes' principle according to which a body immersed in

a liquid receives a buoyancy equal to the weight of displacedliquid,The principle of attraction between North and South poles oftwo permanent magnets and that of repulsion between likepoles.This principle has two applications in the BONT magnetic

level gauge:first between the magnet in the chamber float and everysingle magnet of the indicating scale,second between the magnets of the indicating scale.

The BONT Magne-tic Level Gauges

are manufactured in different Types and Classes, for variousoperating conditions, listed below in Fig. 3342.Plant operating and design conditions must be clearly indicatedfor choice of suitable level gauge.Choice of level gauge depends also on specific gravity of vesselmedium.If you want to use a level gauge for conditions different (lesssever too) from those to which it was originally supplied, pleasecontact our Engineering Department.

The most utilized materials are:

TP 316 - TP 316L - TP321PVC - PP - PVDF - PTFETP 316 - Titanium - PVC - PP - PVDF - PTFE

Aluminium with glass protection.When aluminium is not allowed, indicatingscale is protected by a seal tight stainlesssteel housing.

Accord ing to the operat ing condit ions, we supply the levelgauge in the most suitable material combination.Generally iron, copper and silver alloys are excluded.

The BONT magnetic level gauge consists of:

two horizontal stub pipes for connection to the vessel con-

taining the liquid of which we wish to know the level;two stop valves (one on each stub pipe) to isolate the levelgauge;a vertical chamber consisting of a tube of suitable diameterand thickness containing a float wherein a permanent magnetis placed exactly on the liquid level line;an indicating scale, outside the vertical chamber, consisting ofa case of non-magnetic material with transparent front facecontaining a set of small permanent magnets enclosed insmall cylinders which can rotate on their horizontal axis.These cylinders show an external surface having two differentcolours.

According to the orientation of each magnet (due to the actionof the magnet in the float) each cylinder will show externally halfof its surface of one colour or the other.

The indicating scale will be of one colour (e.g. white) over thechamber area taken up by gas, vapour or steam phase con-trasting with the other colour (e.g. red) over the chamber areataken up by liquid phase.

Alarm system for damaged float. The three bottom cylinders ofthe indicating scale are placed lower than the bottom connec-tion of the magnetic level gauge. They are used for control offloat efficiency. With float damaged and its consequent sinkingin the liquid, these three cylinders show the yellow surfaces.

These level gauges are very suitable for interface reading: thelevel gauge float has only to sink in the liquid having lowerspecific gravity and to float on the liquid having higher specificgravity.In spite of its simple operating principle, the BONT magneticlevel gauge represents the result of long research and expe-

rience in design, sizing, choice of materials and manufacturingtechnology.

The application range is very wideand includes all the situations whe-

re the fluids are:at high pressure, at low or high temperature,at low pressure, at low or high temperature,chemically aggressive,pollutant to environment,noxious or poisonous to man,inflammable or explosive,with identical optical characteristics of the superimposedphases (interface)

OPERATING PRINCIPLE

OPERATING CONDITIONS

MATERIALS

DESIGN

APPLICATIONS

-------

-

-

Vertical Chamber:

Float:Indicating Scale:

Fig. 3342

10 +20 38 50 100 120 150 200 250 300 350 375 400

9 9 9 9 9 9 9 9 9 9 7 7

A1 A1 A1 A1 A1 A1 A1 A1 A1 A1 A1 A1

27 27 26 20 18 16 13 11 10 10 9 7

A2 A2 A2 A3 A3 A3 A4 A4 A4 A4 A5 A5

60 60 60 50 45 39 22 17 12 10 10 9

B1 B1 B1 B3 B4 B5 B6 B6 B7 B8 B9 B10

60 60 58 58 52 48 42 39 27

C1 C1 C2 C2 C3 C4 C5 C6 C7

118 118 118 86 71 66 38 29 33 18 15 13

F1 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11

118 115 115 98 88 80 67 65 63

G1 G1 G1 G2 G3 G4 G5 G6 G7

170 170 170 170 168 167 165 164 160 152 148 146H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1

291 291 291 291 291 284 280 278 270 258 252 248

N1 N1 N1 N1 N1 N1 N1 N1 N1 N1 N1 N1

388 388 388 388 385 385 385 372 352 345 345 330

P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1

Type MAX Operating Temperature (C)

MAX Operating Pressure (bar)

MAG / MNP Class


MAG / MLP Class


MAG / TLP Class


MAG / TLPS Class


MAG / THP Class


MAG / THPS Class

MAX Operating Pressure (bar)MAG / THPX Class


MAG210 / THP Class


MAG210 / THPS Class


4/23BONT

Each instrument is equip-

ped with an indicatingscale, fixed to the gauge chamber by means of brackets withspring or hose clamps.The scale is made of rotating cylinders housed in a one piececase of austenitic stainless steel with glass in the front to allowthe reading.The scale allows continuous reading. The length of the scale issuitably sized for the gauge;

Axis to axis distance between cylinders is 10 mm.At the bottom of the scale five cylinders white/yel low, placedlower than the bottom connection to the gauge to the drum, areused for evidencing alarm situations due to float sinking.There are different scales:- Standard Scale

The standard scale is water proof. The sealing is obtained

using silicone gaskets.The cylinders are of plastic material of white/red colour,suitable for fluid operating temperature up to 300 C.

- High Temperature ScaleIn this scale the cylinders are of special plastic material ofwhite/black colour, suitable for fluid operating temperature upto 400 C. These white/black cylinders may be used also instandard scales for better reading in case of black/whitetelevision remote transmission.For eventual higher temperature special scales are available.

- Scale with Non-frosting ExtensionPerspex non-frosting extension of hight suitable to theoperating temperature can be fixed and sealed on the scale.This solution allows the reading of the level also in case offrost on the gauge chamber and scale.

4

The most usedMaterial Schedules are listed below.

MATERIAL SCHEDULES

Our magnetic level gauges aremanufactured with the C to C

and Visible Length requested by customers, up to approx 6,500mm for level gauges having a stainless steel vertical chamberand up to approx 3,500 mm for level gauges having a verticalchamber in synthetic polymers.

An intermediate flanged connection is made for longer C to Cdistances.

With the exception of PTFE level gauges, the visible length cancorrespond with the C to C distance.

CENTRE TO CENTRE DISTANCE

VISIBLE LENGTH

We always recommend the fittingof shutoff cocks/valves between le-

vel gauge and vessel.

CONNECTIONS

INDICATING SCALE

Connections arrangement. The standard and mostrequested arrangement(see Arrang. 1) consistsof 2 horizontal vesselconnecting stub endsfitted on same vertical.Different arrangements(see 2, 3, etc.) can be

made for special requi-rements.

Fig. 3303

Connections are as follows:welded flanges: Standard, PN, DN and facing to be indicated,slip-on flanges: Standard, PN, DN and facing to be indicated,male threaded: Standard and DN to be indicated,female threaded: Standard and DN to be indicated,threaded union nut for 3-piece connection ( to be indicated),S.W., Standard and DN to be indicated,B.W., Standard and DN to be indicated.

Connections types.Listed below are types of gauge connections:Vertical chamber connections, if this is furnished WITHOUTcocks/valves,cocks/valves connections, if cocks/valves are INCLUDED inthe supply. In this case the chamber/valve connections is atechnical detail which usually does not concern the end user.

-

-

-------

Calibrated Scale.At th e side of th eindicating scale a stainlesssteel calibrated scale canbe assembled Fig. 3304.The standard calibration isin cm.On request any differentcalibration or material canbe supplied.

Magnetic Switches.It is advisable, but not indispensable, that the fixing of themagnetic switches to the level gauge is made by the gaugemanufacturer. Please state in your order if there are specificreading ranges within which the switch setting has to be made,or if the setting is to be considered continuous on all the lengthof the indicating scale. In both cases the location of theswitches can be adjusted with millimetric precision without anyspecial tool.The switches can be added also subsequently to delivery of thegauge.

Any switch can be located:- with respect to the hight of the gauge scale:

- adjustable with continuity at the required level on the wholelength of the indicating scale

- adjustable within specific range to be stated in the order- with respect to the orizontal plane (Fig. 3305):

- located at 180 in respect to the indicating scale, with an

allowance range particularly wide, that is of 55- at the side of the indicating scale, indifferently on the left orright side, and on both sides.

Therefore there is the possibility of having more than onemagnetic switch at the same level (Fig. 3305).Please state in your order whether there are specific needs inthe location of switches.

Fig. 3304

Material Vertical Float Remaining NOT

Schedule Chamber and Wetted Wetted

Stub Ends Parts Parts

36/52 Tp 316L Tp 316 A 105 A 105

36/63 Tp 316L Tp 316 Tp 316 S.S.

36/64 Tp 316L Tp 316 Tp 316 A 105

TIT/52 Tp 316L Titanium A 105 A 105

TIT/63 Tp 316L Titanium Tp 316 S.S.

TIT/64 Tp 316L Titanium Tp 316 A 105

PVC PVC PVC PVC PVC

PP PP PP PP PP

PVDF PVDF PVDF PVDF PVDF

PTFE Tp 316 + PTFE PTFE A 105

PTFE

Slip-on flanges are manufactured in the most suitable mate-rial.Flange connecting bolts are of the most suitable material.


5/23

1 - Gauge Chamber2 - Indicating Scale3 - Magnetic SwitchA - Blind Area

5BONT

Some level gauge types aswell as special operating

conditions need, during startup and stop operations, a strictcompliance with the instructions enclosed with each instrument.

Each magnetic switch contains one or more electric contacts foropening/closing the control circuits for: TOP alarm, BOTTOMalarm, pump starting, pump stopping, warning, etc. The mostused switches are suitable for 0.28 A at 230 V, 60 VA; maxcurrent of contact: 1 A at 60 V. A suitable relay should be fittedfor higher power supplies.

We supply different types of magnetic switches:- monostable, bistable- explosionproof, etc.

Choice of magnetic switches should be made according to plan-ned wiring diagram and safety standards of plant.

Remote Reading.The BONT Remote Reading System type MST (Multi SwitchTransmitter) is supplied for remote reading from a magneticlevel gauge.See page 14 and following.

Heating / Cooling.Level gauge, depending on contained fluids, can be heated/-cooled.Level gauge for these applications is equipped with heating

equipment which can consist of:one externally fitted pipe contacting vertical chamber and tra-ced by steam, heat transfer fluid, etc. (Fig. 3306);a suitable quantity of armoured resistors, externally contactingthe vertical chamber (Fig. 3307);one stainless steel jacket welded externally on vertical cham-ber; space between jacket and vertical chamber is traced byheating fluid (Fig. 3308). Section of space is very wide withrespect to section of vertical chamber, therefore heatingaction is very effective.

Heating of shutoff valves could be considered.Insulating of the whole instrument can be performed on site,after installation, if necessary.

STARTUP AND STOPWhen ordering or requestingprices, please state:

type of fluids contained in the level gauges and their specificgravity,plant operating and design pressure,plant operating and design temperature,centre to centre distance (CC),visible length,type of vessel connections.

This Magentic Level Gauge is patented in Italy as well as inother Countries.

ENQUIRIES ANDPURCHASE ORDERS

These instruments do not usually needany servicing.

SERVICING

-

-

-

Fig. 3305

Fig. 3306 Fig. 3307 Fig. 3308

-

-----


6/23

Magnetic Level Gaugesof Stainless Steelfor PN 10/40 - 400

BONT

The most used Material Schedules are listed below.

These Magnetic Level Gauges are manufactured in theTypes and Classes listed in Fig. 3342, Page 3.Plant operating and design conditions must be clearlyindicated for choice of suitable level gauge.Choice of level gauge depends also on specific gravity ofvessel medium.

If you want to use a level gauge for conditions different (lesssevere too) from those to which it was originally supplied,please contact our Engineering Department.

BONT6

Fig. 3321

Fig. 3322

1

2

Vessel connections are usually flanged. Standard flangesare: UNI PN 40 - DN 20; UNI PN 64/100 - DN 25; ANSIB16.5 - 3/4" or 1" - 300 RF or 600 RF.

4

These level gauges are supplied:without shutoff valves (Fig. 3321),with shutoff valves. Fig. 3322 shows a level gauge withStellite seated BONT valves. We also supply level gaugeswith sleeve-packed cocks (Fig. 3326), piston valves (Fig.3343) or different shutoff elements.

We recommend the fitting of shutoff devices between levelgauge and vessel.

3

--

Material Vertical Float Remaining NOT

Schedule Chamber and Wetted Wetted

Stub Ends Parts Parts

36/52 Tp 316L Tp 316 A 105 A 10536/63 Tp 316L Tp 316 Tp 316 S.S.36/64 Tp 316L Tp 316 Tp 316 A 105TIT/52 Tp 316L Titanium A 105 A 105TIT/63 Tp 316L Titanium Tp 316 S.S.TIT/64 Tp 316L Titanium Tp 316 A 105

Slip-on flanges are manufactured in the most suitable mate-rial.Flange connecting bolts are of the most suitable material.

Bottom end is usually equipped with a flange having a 1/2"NPT drain plug to ANSI B2.1.

Plug can be replaced by:a sleeve-packed cock DN 1/4" with 1/2" NPT connectionsto ANSI B2.1 (overall dimension increases of approx.130 mm),a piston valve DN 5" with 1/2" NPT connections to ANSIB2.1 (overall dimension increases of approx 80 mm),a metallic seating valve DN 1/4" with 1/2" NPT connec-tions to ANSI B2.1 (overall dimension increases of approx.

240 mm).

5

-

-

-

Top end is usually supplied with a vent plug 1/2" NPT toANSI B2.1. As to possible vent cock or valve, see para 5.

6


7/237BONT

Overall dimensions of level gauge depend on operatingconditions as well as on process fluid. Usually they can beobtained from tables below:

7

Adequately ballasted floats are used with liquids having speci-fic gravity over 1.100 g/cm3.H A further free area, besides B dimension, is needed for fitting

and/or removing float. Its dimension is approx 300 to 400mm and depends on float length.

For vertical chamber obtained from pipe & 48.3 x 1.65and float of Tp 316

for specific gravity A B Hg / cm3 mm mm

0.750 0.809 245 4300.810 0.909 210 3650.910 1.110 175 300

For vertical chamber obtained from pipe & 48.3 x 1.65and float of Titanium

for specific gravity A B .g / cm3 mm mm

0.526 0.580 235 3740.581 0.663 200 3200.664 0.870 165 274

For vertical chamber obtained from pipe & 60.3 x 3.91and float of Titanium

for specific gravity A B .g / cm3 mm mm

0.765 0.794 235 3990.795 0.891 240 3330.892 1.050 210 265

Fig. 3326

Fig. 3343When ordering or requesting prices, please state:type of fluids contained in the level gauge and their specificgravity,plant operating and design pressure,plant operating and design temperature,centre to centre distance (CC),visible length,type of vessel connections.

These instruments are used with fluids having min. specificgravity 0.526 g/cm3.

This Magnetic Level Gauge is patended in Italy as well as inother Countries.

8

-

-----


8/23

Magnetic Level Gauges

of Synthetic Polymers

BONT

Material Vertical chamber Max Operating Conditions

Sche- from pipe Pressure Temperature

dule & x thick bar C

PVC & 50 x 3.9 0.5 060

PP & 50 x 2.9 0.5 090

PVDF & 50 x 3.0 0.5 40 throught +140

Gauges for PN 10 available on request

8 BONT

Fig. 3323

Fig. 3324

These level gauges are manufactured in type MAG-MNPonly. Max operating conditions depend on used material.Usually they are as follows:

1

Material Schedules consist of following materials:2

These level gauges are supplied:- without shutoff valves (Fig. 3323),- with shutoff valves (Fig. 3324).

Anyway we recommend fitting of shutoff valves.

Vessel connections are usually flanged. Standard flangesare: UNI PN 10 - DN 20 or DN 25 or DN 40; ANSI B 16.5 -150 RF 3/4" or 1" or 1.1/2".

Bottom end is usually equipped with a flange having a 1/2"BSP drain plug. Drain plug can be replaced by a ball valveDN 10. With this application, overall length increases ofapprox. 100 mm.

Top end is supplied with a vent plug 1/2" BSP. As to fittingof vent valve see para 5.

Overall dimensions of level gauge depend on operatingconditions as well as on process fluid.Generally they are as follows:- Dimension A approx. 110 mm,- Dimension B approx. 170 mm.

A further area, besides B dimension, is needed for fittingand/or removing float. Its dimension is approx. 200 mm anddepends on float length.

When ordering or requesting prices, please state:type of fluids contained in the level gauge and their specificgravity,plant operating and design pressure,plant operating and design temperature,centre to centre distance (CC),visible length,type of vessel connections.

These instruments are usually used with fluids having spe-cific gravity 1 g/cm3.

This Magnetic Level Gauge is patented in Italy as well as inother Countries.

3

4

5

6

7

8

9

-

-----

Material Vertical Float Remainig NOT

Sche- Chamber and Wetted Wetted

dule Stub Ends H Parts Parts

PVC PVC PVC PVC PVCPP PP PP PP PP

PVDF PVDF PVDF PVDF PVDF

Slip-on flanges are manufactured in the most suitable ma-terial.Flange connecting bolts are of the most suitable material.

The float can be supplied of noble or high alloy metal,provided it is compatible with the process fluid.

H


9/23

Bottom and top ends are equipped with a flange having acap which can be replaced by a valve, on both bottom andtop end.

5

Magnetic Level Gaugesof Stainless Steel, PTFE lined

9BONT

BONT

These level gauges are manufactured in type MAG-MNPonly. Max operating conditions depend on used material.Usually they are as follows:

1

Material Schedule PTFE consists of following materials:2

Vessel connections are usually flanged. Standard flangesare: UNI PN 10 - DN 25; ANSI B 16.5 - 150 RF - 1".Flanges are usually slip-on. Raised face has the dimensionsas in Fig. 3331.

4

These level gauges are supplied:- without shutoff valves (Fig. 3325),- with shutoff valves, usually with flanges fitted on stub ends.

Anyway we recommend fitting of shutoff valves.

3

Fig. 3325

Fig. 3331

When ordering or requesting prices, please state:kind of fluids contained in the level gauge and their specificgravity,plant operating and design pressure,plant operating and design temperature,centre to centre distance (CC),visible length. Dimension of visible length is shorterapprox. 200 mm than CC,type of vessel connections.

8

These instruments are usually used with fluids having spe-cific gravity 1g/cm3.

This Magnetic Level Gauge is patented in Italy as well as inother Countries.

9

-

----

-

Overall dimensions of level gauge depend on operating con-ditions as well as on process fluid.Generally they are as follows:- Dimension A approx. 90 mm.- Dimension B approx. 90 mm.

A further free area, besides B dimension, is needed for fit-

ting and/or removing float. Its dimension is approx. 250 mmand depends on float length.

7

Material Vertical Chamber Max OperatingSche- Conditions

dule Pressure Temperaturebar C

PTFE Tp 316 & 60.3 x 2.77 0.5 25 throught +150+ PTFE: 3 mm min.

Gauges for PN 10 available on request

Material Vertical Float Remaining Stub End

Sche- Chamber Wetted and remainingdule Parts NOT Wetted

H Parts

PTFE Tp 316 + PFTE PTFE PTFE A 105

Slip-on flanges are manufactured in the most suitable ma-terial.Flange connecting bolts are of the most suitable material.

The float can be supplied of noble or high alloy metal,provided it is compatible with the process fluid.

H


10/2310

Magnetic Level Gauges Series MAG 210for Water Steamup to 210 bar Pressure

BONT

BONT

Fig. 3343

Fig. 3327

These magnetic level gauges are for saturatedsteam applications and can be installed on asteam boiler drum for service under the condi-tions listed in the above table.They can withstand all transient states: starting,warm standstill, cold standstill, quick depressu-rization of boiler drum where they are fitted.

These level gauges are always supplied with 2stop valves.If required by operating conditions, a drain valve- necessary for commissioning - is supplied.

Vessel connections are usually flanged, size DN20 (3/4") or DN 25 (1"), machined to the requiredStandards (UNI - DIN - ANSI etc.) and to the PN(Rating) for the required application.

Each level gauge is manufactured with the re-

quested C to C distance, up to approx. 6,500 mm.The C to C distance corresponds usually with thevisible length.The indicating scale is a continuous readinginstrument, monoblock. It is fixed on the verticalchamber and can be orientated on plant sitewithout special tools.One or more magnetic switches can be fitted andpositioned at the desired height for alarms, pumpstarting and stopping, warning etc. See also onpage 14 and following our Remote ReadingSystem type MST.

The bottom end is usually supplied with a flange

enabling fitting of float and internal cleaning.Flange has a drain plug or a drain valve, depen-ding on operating conditions.

The top end is equipped with:- a welded end cap and a vent plug, or- a flange identical to the bottom one and a vent- plugOn request we supply a vent valve for both appli-cations.

1

2

3

4

5

6

Type and Class Figure Material Material Fluid

Schedule Vert. FloatChamb

MAG 210 / MNP - Cl. A1 3343 36/52 Tp 316L Tp 316L

MAG 210 / TLPS - Cl. C4 3343 TIT/52 Tp 316L TitaniumMAG 210 / THPS - Cl. G4 3327 TIT/52 Tp 316L Titanium

MAG 210 / THP - Cl. N1 3345 SPEC Tp 321L Titanium

009 175 210 365

045 257 165 274 080 294 235 710

210 369 233 770

MAX Operating Overall DimensionsConditions

Pressure Temperature A B H E Hbar C mm mm mm

Choice of materials can be modified according to the environmental conditions of plant (outdoor/indoor, cold/warm/tropical climate).


11/2311BONT

Fig. 3345The overall dimensions of level gauge are thoselisted in the table and figures. Some of thesedepend on the size of the selected flanges.H A further free area, besides B (or E) dimen-

sion, is needed for fitting and/or removingfloat. Its dimension is approx 300 to 400 mmand depends on float length.

When ordering or requesting, please state:type of fluid contained in the level gauge: waterand saturated water steam atbar pressure.possible temperature transient atCthe C to C distance (CC)the visible lengththe type of vessel connections (DN, PN, fini-shing, Standards etc.)

These Magnetic Level Gauges are patented in Italy aswell as in other Countries.

7

8

-

----


12/2312

Magnetic Level Gaugesfor Remote Direct Reading - type MAG-RDR

BONT

BONT

Fig. 3332

The Magnetic Level Gauge Type MAG-RDR (Remote Direct Reading) can be installed onany boiler, as a completion of the Glass Level Gauges (which are compulsory) and of theMagnetic Level Gauges.Two connections on boiler drum are sufficient for installation.

The plant consists of:Connections on boiler drumCondensate container at constant level fitted on top connection, with a vent valveDownwards pipesManifold cock for shutoff and resetMud traps

Differential pressure gauge containing a special fluid heavier than water, not water-soluble. One of the two branches of the pressure gauge is fitted with a float containinga magnet moving upwards and downwards depending on water level of drum.Indicating scale for direct level reading outside of differential pressure gauge.

The plant can be also fitted by the BONT Remote Reading System Type MST,consisting of:Reading Sensing Element, fitted outside at the height of floatThree-Wire screened cable connecting the remote level gauge with the transmittingsystem

Transmitting system, usually located in the control room, consisting of:a single-column (type MST.X) or double-column (type MST.XX as per Fig. 3323) LedIndicator ora Transducer (type MST.A) with Analogic Indicator ora Transducer (type MST.B) for connection with max 3 Instruments (Indicator,Recorder, etc.) or

a Transducer with warning thresholds (type MST.C) including 4 outputs for as manyadjustable warning Thresholds and 3 outputs for as many Instruments (Indicator,Recorder, etc.)

When a magnetic level gauge (12) with another sensing element (13) is fitted on the drumof the same boiler and the signal is transmitted to another transducer (11) of the controlroom, the comparison between 10 and 11 guarantees the security.

These instruments are patented in Italy as well as in other Countries.

0102030405

06

07

0809

10

-

--

-


13/23

Magnetic Level Gaugeswith Float immersed in Vessel

13BONT

BONT

Fig. 3333The operating principle of the BONT Magnetic Level Gaugesis applied also with the instrument directly immersed in thevessel. Vessel can have any form (cylindrical, paralleliped, etc.)and be installed out of ground or under ground.Vessel can be under atmospheric or even very high operatingpresssure. The working stresses of level gauge are insignificant

in comparison with those of vessel walls.

This instrument (Fig. 3333) includes schematically:a float (3333.1) immersed in vessel with an adequately longvertical extension fitted with a permanent magnet at the topend. The float is guided by a tube (3333.2) in its up-wards/downwards movements according to the liquid levela flange (3333.3) to couple with the horizontal flange exi-sting or to fit on vessela vertical chamber (3333.4), consisting of a tube of suitablediameter and thickness fastened on flange and guiding tube.The float extension and its permanent magnet are introdu-ced into the vertical chamber

outside the vertical chamber, containing the bicolour smallcylinders showing clearly the float and consequently the

liquid level in vessel.

Accessories.This instrument can be completed with:one or more magnetic switches fitted externally on the ver-tical chamber, orwith the BONT Remote Reading System type MST, seepage 14 and following.

Materials.The most used materials are:stainless steel (different types)plastic materials (different types).

Generally iron, copper and silver alloys are excluded.

Enquiries and Purchase Orders.When ordering or requesting prices, please state:type of fluids contained in the level gauge and their specificgravityvessel operating and design pressurevessel operating and design temperatureposition and length of displacement level to be measuredsizes of vessel flange for level gauge connection (generally:3 inch).


14/2314

Remote Reading System type MSTBONT

BONT

GENERAL INFORMATIONThe BONT Remote Level Reading System type MST (MultiSwitch Transmitter) is an additional and subsidiary method forany BONT Magnetic Level Gauge, already described in thepreceding pages. This system is applicable to BONETTI

magnetic level gauges, only.The MST reading system is compatible with any accessorypresent on level gauge, already described on page 4 and -firstly - with indicating scale.In this way we have a level gauge showing the direct reading onsame instrument and simultaneously the remote onetransmitted by a three-conductor screened cable.We would emphasize that the MST System can be fitted on anyBONT magnetic level gauge, under any pressure and with anyMaterial Schedule (Stainless Steel, Synthetic Polymers, PTFELinings, Titanium), even already installed.The MST System can be also fitted with a plotter recording levelvariations depending on time.The operating range of this System is consequently wideincluding chemical and petrochemical industries as well aspower plants. To this purpose we draw your attention to the fact

that the BONT

Series MAG 210 Level Gauge with MSTRemote Reading System has been approved by ISPESL(Istituto Superiore per la Prevenzione e la Sicurezza del Lavoro- Accident Prevention and Safety Board) with Authorization No.1441 dated 09.02.1990 for installation on drums of steamgenerators, without pressure limits.

The MST System can be installedin any weather condition, since not affected by heat, cold,freezing, windin explosionproof areas, since the intrinsic safety is obtainedby Zener barriers. Upon request we supply devices wherenone of the values 1.2 V, 0.1 A, 20 J or 25 mW is excee-ded. Therefore neither certificates nor marks are neededaccording to European Standards Cenelec EN 50.014.

Up to now we have considered the BONT Remote Reading

System type MST by means of a reading sensing element (Fig.3334) to fit on a Magnetic Level Gauge outside the vessel. TheMST System includes also a reading sensing element (Fig.3344) to be installed inside the vessel. The sensing elementtransmits the signal to an Indicator/Transmitter by a screenedcable.

Fig. 3341

Type MST.X Type MST.A Type MST.B Type MST.C

PATTERNSWe supply different patterns of MST System, namely:

Type MST.X Indicator with a single column of ledsType MST.XX Indicator with a double column of leds

The system consists of:Reading Sensing ElementThree-Conductor Screened Cable connect ing theSensing Element with the IndicatorIndicator with leds, of two types:with single column (Type MST.X). The led is GREENwhen liquid reaches this level, whereas the led is RED inpresence of gas/steamwith twin column (Type MST.XX), with two columns ofleds. One column shows GREEN leds with liquid at thelevel, the other one shows RED leds with gas/steam atthe level.

Type MST.A Transmitter/Indicator, consisting ofReading Sensing ElementThree-Conductor Screened Cable connecting the Sensing

Element with the Transmitter/IndicatorTransmitter/Indicator including an instrument with 0 to100% pointer as well as outputs for 2 other instruments(Recorder, etc.).

Type MST.B Transmitter, consisting ofReading Sensing ElementThree-Conductor Screened Cable connecting the SensingElement with the TransmitterTransmitter with 3 outputs for as many instruments(0 to 100% Analogic Indicator, Recorder, etc.).

Type MST.C Transmitter with Warning Tresholds, consi-sting ofReading Sensing ElementThree-Conductor Screened Cable connecting the

Sensing Element with the TransmitterTransmitter, equipped with

1 Terminal Board with 3 Outputs for as manyinstruments(0 to 100% Analogic Indicator, Recorder, etc.)1 Terminal Board with 4 Outputs for the adjustableThresholds. Calibration can be executed on field, byoperating the Potentiometers fitted in the instrument4 Pilot Lights, placed on the instrument front face, forlocal warning indication.

1 1

1

1 1

1

1 1

1

1 1

1


15/23

Reading Sensing Element for external Magnetic Level Gau-ge, (Fig. 3334) consisting of a column of "Reeds" MagneticSwitches.

Sharpness:

Total Resistanceof Measuring System:

Output Connection:

Dimensions:

Protection:

Temperature Limits:

Material:

Remote Reading System - type MSTSensing Elements

15BONT

BONT

Fig. 3334

Fig. 3344

standard 15.0 mmon request 7.5 mm

in standard patternin intrinsic safety

Three-Pole Connector Type VEAM,with screened cable

see Fig. 3334Max Length (L) 6,000 mm

IP 65

20 up to +100Cthe Sensing Element can be fittedalso on the BONT Magnetic LevelGauges Type MAG 210-THP, for

application on boilers up to 210bar and 370C

F 316 Stainless Steel

l

l

l

l

l

l

l

l

l

l

Reading Sensing Element for Vessel Internals, (Fig. 3344)consisting of:a column of "Reeds" Magnetic Switches (3344.1)a Float (3344.2) containing a permanent magneta Vessel Connection Flange (3344.3)

a Magnet Guide (3344.4)

Sharpness:

Total Resistanceof Measuring System:

Output Connection:

Dimensions:

Protection:

Operating Limits: Specific Gravity: Temperature: Pressure:

Materials:

standard 15.0 mmon request 7.5 mm

in standard patternin intrinsic safety

Three-Pole Connector Type VEAM,with screened cable

see Fig. 3344Max Length (L) 6,000 mm

IP 65

min. 0.6 kg/dm3

20 up to +100Cmax 50 bar

Sensing Element Body and Flangeof F 316 Stainless SteelFloat of F 316 Stainless Steel orTitanium.

l

l

l

l

l

l

l

l

l

l

l

l

5 kOhm50 kOhm

5 kOhm50 kOhm


16/2316

Remote Reading System - type MSTBONT

BONT

Type MST.X - Single Column Leds Indicator (Fig. 3336)

Type MST.XX - Twin Column Leds Indicator (Fig. 3337)

Input Signal:

Input Connection:

Indication:

Accuracy:

Power Supply:H

Absorbed Power:

Alarm System:

Installation:

Protection:

Temperature Limits:

Overall Dimensionsand Weight:

Material:

from Reading Sensing Element

Three-Pole Connector Type VEAM,with three-conductor screenedcable

Type MST.X (Fig. 3336)- up to 13 RED or GREEN leds, or- 14 to 24 RED or GREEN ledsType MST.XX (Fig. 3337)- up to 13 pairs of RED and GREEN- leds, or- 14 to 24 pairs of RED and GREEN- leds

given from sharpness of sensingelement

12/24/48 V D.C. or

24/110/230 V A.C. 50/60 Hz

7.5 VA, up to 13 leds (or pairs ofleds)15 VA, 14 up to 24 leds (or pairs ofleds)

3 YELLOW flickering adjustable leds

on panel board

the instrument must be installed ina safe area. The connection withhazardous areas must be effectedby means of safety barriers.Protection IP65 available.

20 up to +100C

see Fig. 3336 and 3337

Carbon Steel structure

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

Fig. 3336 Fig. 3337

Overall A A1 B C WeightDimensions mm mm mm mm kg

Up to 13leds 250 215 235 190 2.000

14 up to 24leds 300 265 285 240 3.400

Buffer Battery can be supplied on request.The system is made of:

Battery automatic connecting/disconnecting Circuit withswitch relay

Maintenance free Battery 12 V - 6,5 Ah, seal tightexecution, with protection IP65 or explosionproof

Automatic battery Charger with input 110/230 V -15 VA max having following characteristics:

charge current limitation 0,6 A x 10 h change-over to holding current (50 mA) with electronic

balance of min and max voltage.

H


17/23

Remote Reading System - type MST

17BONT

BONT

Type MST.A - Transmitter/Indicator (Fig. 3338)

Input Signal:

Input Connection:

Output Signals:

Indicator:

Accuracy:

Power Supply:H

Absorbed Power:

Installation:

Protection:

Temperature Limits:

Overall Dimensions:

Weight:

Material:

NOTE:


Three-Pole Connector Type VEAM,with three-conductor screened cable

1 Range 0 up to 100 A1 Range 0 to 20 mA or 4 to 20 mA

built-in with scale 0 up to 100 mA(dimension of dial: 72 x 72 mm)

1.5%

12/24/48 V D.C. or24/110/230 V A.C. 50/60 Hz

1.5 VA

on wall

IP 65

20 up to +60C

200 x 120 x 75 mm

0.680 kg

Housing of ABS

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

Fig. 3338

Fig. 3339

On request we supply separately further indicators Ato DIN 43700, with 90 pointer movement and scale 0up to 100% to fit on panel board in accordance withone of the three dimensions of dial: 72 x 72 / 96 x 96 /144 x 144 mm, and with following features:- Protection: IP 00, IP 52- Accuracy: 1.5 %

Type MST.B - Transmitter (Fig. 3339)

Input Signal:

Input Connection:

Output Signals:

Accuracy:

Power Supply: .

Absorbed Power:

Installation:

Protection:

Temperature Limits:

Overall Dimensions:

Weight:

Material:

NOTE:


Three-Pole Connector Type VEAM,

with three-conductor screened cable2 Ranges 0 up to 100 A1 Range 0 to 20 mA or 4 to 20 mA

1.5%

12/24/48 V D.C. or24/110/230 V A.C. 50/60 Hz

1.5 VA

on wall

IP 65

20 up to +60C

200 x 120 x 75 mm

0.680 kg

Housing of ABS

l

l

l

l

l

l

l

l

l

l

l

l

l

l

On request we supply separately indicators A to DIN43700, with 90 pointer movement and scale 0 up to100% to fit on panel board in accordance with one ofthe three dimensions of dial: 72 x 72 / 96 x 96 / 144 x144 mm, and with following features:- Protection: IP 00, IP 52- Accuracy: 1.5 %







H


18/2318

Remote Reading System - type MSTBONT

BONT

Type MST.C - Transmitter with Alarm Thresholds (Fig. 3340)

Input Signal:

Input Connection:

Output Signals:

Features of thresholdcontacts:

Accuracy:

Power Supply:H

Absorbed Power:

Installation:

Protection:

Temperature Limits:

Overall Dimensions:

Weight:

Material:

NOTE:


Three-Pole Connector Type VEAM,with three-conductor screened cable

2 Ranges 0 up to 100 A1 Range 0 to 20 mA or 4 to 20 mA4 Thresholds, adjustable on thewhole measuring range.

05 A 250 V A.C.10 A 125 V A.C.05 A 030 V D.C.

1.5%

12/24/48 V D.C. or24/110/230 V A.C. 50/60 Hz

2 VA

on wall

IP 65

20 up to +60C

200 x 120 x 75 mm

0.820 kg

Housing of ABS

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

On request we supply separately indicators A to DIN43700, with 90 pointer movement and scale 0 up to100% to fit on panel board in accordance with one ofthe three dimensions of dial: 72 x 72 / 96 x 96 / 144 x144 mm, and with following features:

- Protection: IP 00, IP 52- Accuracy: 1.5 %

Fig. 3340







H


19/23

Magnetic Level Switchestype MAG-LISof Stainless Steelfor PN 10/40

19BONT

BONT

Fig. 3330The Magnetic Level Switches operate according to the sameoperating principle as indicated on page. 3

These switches consist of:a vertical chamber consisting of a tube of suitable diameter

and thickness containing a float wherein a permanentmagnet is fixed by means of a special patented device;The chamber is generally fixed on the vessel by only oneflange sized DN 32 of 40 or 50 having a PN suitable to theapplication;a magnetic switch, fitted on the vertical chamber at thedesired height.This magnetic switch contains one or more electric con-tacts for opening/closing the control circuits for: TOPalarm, BOTTOM alarm, pump starting, pump stopping,warning etc.The most used switches are suitable for 0.28 A at 220 V,60 VA; max current of contact: 1 A at 60 V. A suitable relayshould be fitted for higher power supplies.We supply different types of magnetic switches:

monostable, bistable explosionproof, etc.Choice of the suitable magnetic switch should be made ac-cording to the planned wiring diagram and safety stan-dards of plant.

When the float is moved upwards in the gauge by the liquidflowing through the connection flange, the magnet containedin the float operates the switch.With liquid level lowering in the vessel, the float moving down-wards effects the opposite operation.

Obviously the only one verifiable level height is that where thevessel flange is positioned.

When ordering or requesting price please state:type of fluid contained in the level gauge and its specific

gravityplant operating and design pressureplant operating and design temperatureDN and PN of connection flange.

This Magnetic Level Switch is patented in Italy as well as inother Countries.


20/23

BONT

20 BONT


21/2321BONT

BONT


22/23

BONT

22 BONT

C F C F C F C F bar C-270 -454 165 329 520 968 1100 2012 1 99,1-260 -436 170 338 525 977 1120 2048 1,5 110,7250 -418 17.5 347 530 986 1140 2084 2 119,6

-240 -400 180 356 535 995 1160 2120 2,5 126,7230 -382 185 365 540 1004 1180 2156 3 132,8

-220 -364 190 374 545 1013 1200 2192 3,5 138,1210 -346 195 383 550 1022 1220 2228 4 142,9

-200 -328 200 392 555 1031 1240 2264 4,5 147,2190 -310 205 401 560 1040 1260 2300 5 151,1

-180 -292 210 410 565 1049 1280 2336 5,5 154,7170 -274 215 419 570 1058 1300 2372 6 158,0

-160 -256 220 428 575 1067 1320 2408 6,5 161,1150 -238 225 437 580 1076 1340 2444 7 164,1

-140 -220 230 446 585 1085 1360 2480 7,5 167,1130 -202 235 455 590 1094 1380 2516 8 169,6

-120 -184 240 464 595 1103 1400 2552 8,5 172,2110 -166 245 473 600 1112 1420 2588 9 174,5

-100 -148 250 482 605 1121 1440 2624 9,5 176,795 -139 255 491 610 1130 1460 2660 10 179,0

-90 -130 260 500 615 1139 1480 2696 11 183,285 -121 265 509 620 1148 1500 2732 12 187,0

-80 -112 270 518 625 1157 1520 2768 13 190,7-75 -103 275 527 630 1166 1540 2804 14 194,1-70 -94 280 536 635 1175 1560 2840 15 197,3-65 -85 285 545 640 1184 1580 2876 16 200,4-60 -76 290 554 645 1193 1600 2912 17 203,3-55 -67 295 563 650 1202 1620 2948 18 206,150 -58 300 572 655 1211 1640 2984 19 208,8

-45 -49 305 581 660 1220 1660 3020 20 211,4-40 -40 310 590 665 1229 1680 3056 22 216,2-35 -31 315 599 670 1238 1700 3092 24 220,7-30 -22 320 608 675 1247 1750 3182 26 225,0-25 -13 325 617 680 1256 1800 3272 28 228,9-20 4 330 626 685 1265 1850 3362 30 232,7-17,8 0 335 635 690 1274 1900 3452 35 241,4-15 5 340 644 695 1283 1950 3542 40 249,1-10 14 345 653 700 1292 2000 3632 45 256,2

-5 23 350 662 710 1310 2050 3722 50 262,7

0 32 355 671 720 1328 2100 3812 55 268,65 41 360 680 730 1346 2150 3902 60 274,210 50 365 689 740 1364 2200 3992 65 279,515 59 370 698 750 1382 2250 4082 70 284,420 68 375 707 760 1400 2300 4172 75 289,125 77 380 716 770 1418 2350 4262 80 293,630 86 385 725 780 1436 2400 4352 85 297,835 95 390 734 790 1454 2450 4442 90 301,940 104 395 743 800 1472 2500 4532 95 305,845 113 400 752 810 1490 2550 4622 100 309,550 122 405 761 820 1508 2600 4712 105 313,355 131 410 770 830 1526 2650 4802 110 316,560 140 415 779 840 1544 2700 4892 115 319,865 149 420 788 850 1562 2750 4982 120 323,170 158 425 797 860 1580 2800 5072 125 326,2

75 167 430 806 870 1598 2850 5162 130 329,380 176 435 815 880 1616 2900 5252 135 332,285 185 440 824 890 1634 2950 5342 140 335,190 194 445 833 900 1652 3000 5432 145 337,895 203 450 842 910 1670 150 340,6

100 212 455 851 920 1688 155 343,2105 221 460 860 930 1706 160 345,7110 230 465 869 940 1724 165 348,3115 239 470 878 950 1742 170 350,6120 248 475 887 960 1760 175 353,0125 257 480 896 970 1178 180 355,4130 266 485 905 980 1796 185 357,5135 275 490 914 990 1814 190 359,8140 284 495 923 1000 1832 195 361,9145 293 500 932 1020 1868 200 364,1

150 302 505 941 1040 1904 205 366,1155 311 510 950 1060 1940 210 368,1160 320 515 959 1080 1976 215 370,2

220 372,0225 374,0


23/23

CESARE BONETTI S.p.A.CESARE BONETTI S.p.A.I-20024 GARBAGNATE MILANESE (Italy)Via Cesare Bonetti 17

Telephone: (02) 995 64 62 / 995 72 61 / 995 83 13 / 99072.1Telefax: (02) 9952483Internet: http://www.cesare-bonetti.itE mail: bont post@cesare bonetti it

Germany Bonetti Armaturen GmbH In den Fritzenstcker 4 - D 65549 LIMBURG / LAHNTel. (06431) 7 20 41Fax (06431) 7 20 66

Australia - New Zealand Bonetti Australia Pty Ltd 136 Union Street (P.O. Box 170) BRUNSWICK, 3056(Australia) Tel. (03) 3874311 - Fax (03) 3880698

Branch Offices in Foreign Countries

Ask for information about our International Network of Technical Sale Representatives.

This catalogue is exclusive property of Cesare Bonetti S.p.A.Any unauthorised reproduction, in total or in part, of thiscatalogue shall be prosecuted.Products and data sheets of this catalogue are referred tocurrent standard production. Cesare Bonetti S.p.A. reserves theright to carry out any necessary alteration to products andmaterials.

Amendments or modifications to drawing and material can bedone also to comply particular Customers requests or technicalspecifications.

magnetic level gauges

Documents