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Mobrey magnetic level switches - Stránka P MIP

1 Mobrey magnetic level switchesfor liquid level alarm andpump control dutiesprocess measurement solutionsIP1012 CONTENTSPageThe complete horizontal float switch range3 Operation3 Switch selection4 Alarm switching - electrical or pneumatic4 Pump control - electrical or pneumatic4 Low temperature applications4 Choice of switch mechanisms5 Electrical5 Pneumatic5 General purpose applications6-7 Aluminium bronze wetside modelsMarine applications8-9 Submersible - HoseproofGeneral purpose applications10-11 Stainless steel wetside modelsHazardous area applications12-13 Flameproof zone 1 gas group I & IIC modelsChemical wetsideNozzle & stud lengths14 Float chambers15-17 Fabricated chambersCast chambersFloat specifications18-20 Horizontal pump control floats18 Vertical pump control and alarm floats18 Cranked arm floats type and F10419 Companion flanges and accessories21 Applications22

5 CHOICE OF SWITCH MECHANISMS Type D & P Type D6 & P6 Type H6 & B6 Type AP& A M TYPE D For alternative make and break circuits. Function: 2 independent single pole single throw contact sets: "Snap Action".

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Transcription of Mobrey magnetic level switches - Stránka P MIP

1 1 Mobrey magnetic level switchesfor liquid level alarm andpump control dutiesprocess measurement solutionsIP1012 CONTENTSPageThe complete horizontal float switch range3 Operation3 Switch selection4 Alarm switching - electrical or pneumatic4 Pump control - electrical or pneumatic4 Low temperature applications4 Choice of switch mechanisms5 Electrical5 Pneumatic5 General purpose applications6-7 Aluminium bronze wetside modelsMarine applications8-9 Submersible - HoseproofGeneral purpose applications10-11 Stainless steel wetside modelsHazardous area applications12-13 Flameproof zone 1 gas group I & IIC modelsChemical wetsideNozzle & stud lengths14 Float chambers15-17 Fabricated chambersCast chambersFloat specifications18-20 Horizontal pump control floats18 Vertical pump control and alarm floats18 Cranked arm floats type and F10419 Companion flanges and accessories21 Applications22U3 One permanent magnet forms part of a floatassembly which rises and falls with changing liquidlevel.

2 A second permanent magnet is positionedwithin the switch or air pilot valve so that theadjacent poles of the two magnets repel each otherthrough a non- magnetic diaphragm. A change ofliquid level which moves the float through itspermissible travel will cause the float magnet tomove and repel the switch magnet to give the snapaction is accomplished by the angularmovement of the switch magnet being used tooperate "push-rods". These rods bear on contactblades and break one set of contacts whilstallowing the other set to make. The benefit of thisarrangement is that contact force is independent ofthe BBMagnetFloatContact AAPushrodsOPERATIONF loatContact BBMagnetContact AAPushrodsTHE COMPLETE Mobrey HORIZONTAL FLOAT SWITCH RANGE4 ALARM SWITCHING - ELECTRICAL OR PNEUMATICSWITCH SELECTIONPUMP CONTROL - ELECTRICAL OR PNEUMATICH orizontal or vertical :High or low alarm switches are ofrobust construction, making them idealfor a wide range of liquids in liquid applications.

3 The shrouded model should bespecified, thus eliminating fouling ofthe float movement due to deposits orlarge particles becoming liquidsCranked arm float units should bespecified to enable the operatingmechanism to be kept clear of theliquid. Rod extensions shaped toindividual requirements are availableto fit all Mobrey level TEMPERATURE APPLICATIONSS ubmersion :For those applictions where theequipment may be subject to occasionalor continuous submersion thesubmersible model should be marine applications : switches have been specifically designedfor the requirements of these markets& approval authorities, (for details ofapprovals contact the factory).

4 Vacuum applications:All metallic floats are capable ofoperating in full vacuum mounting:(a) Horizontal large differential, twoswitches are used to control thepump for emptying or fillingrequirements.(b) Horizontal limited differential,(555mm maximum) can becontrolled with one switch and avariable differential float mounting:(c) Vertical variable differential,controlled by using one switchvertically mounted and theappropriate adjustable variabledifferential vertical float level switches are suitable forbelow 0 C switch mechanisms type D, P,D6, P6 may be specified for lowtemperature duty down to -30 Cambient and wetside, except inflameproof switches , when H6 must bespecified, allowing use down to -60.

5 If the wetside temperatureremains below that of the switchenclosure for any extended period, thenthere is the possibility of gradual buildup of frozen is due to the breathing which willnaturally occur through any degree ofenclosure protection (IP67 or less) andwill eventually impair the correctmovement of the operating prevent this, we stronglyrecommend the use of the hermeticallysealed switch mechanism type H6, B6,suitable for use down to -60 Materials: Mobrey switches with flanges ANSI#600, #900 and BS 4504 PN64 arefitted with spiral wound non-asbestosfilled gaskets rated to 400 other switches are fitted with non-asbestos sheet material gaskets to BS7531 Grade X, which has uppertemperture limits of 250 C for gas,vapour & steam, and 440 C for the switch will experience gas vapouror steam temperatures above 250 C,then a suitable alternative gasket mustbe fitted.

6 (a)(b)(c)(a)1234123412341234121212121212 1212121212 Cable gland:A cable gland is supplied in the boxwith the S01DB, S179, Mini-switch,and S36 is a brass cable gland, nickel plated,with a fully insulated neoprene seal andwith clamping range to suit 8mm to13mm OD cable gland has type IP68protection to 3m head of water (1 bar),and maximum 800C as a permanenttemperature on submersible switches inapplications greater than 3m (1 bar)submersion, the fitting and testing ofcustomers supplied cable and gland isthe customer s OF SWITCH MECHANISMSType D & PType D6 & P6 Type H6 & B6 Type AP & AMTYPE DFor alternative make and break.

7 2 independent single polesingle throw contact sets: "Snap Action".May be wired on AMFor modulating air controlled : Continuous pressureMax. air pressure through valve: bar(20psi).Modulation: linear: 0 bar to bar to bar available on requestTYPE H6 For use in corrosive area and/or lowtemperature applications. As type D6but with gold plated contacts and allmoving parts housed in an inert gasfilled hermetically sealed B6 For use in Zone II Hazardous type H6 but BASEEFA approvedcoded EX N IIT6 to BS 4683: Part 3 APFor switching air : Change pressureMax. air pressure through valve: 7 bar(100psi).

8 Max. air flow through valve:66 litres/min at 7 bar. Air must be cleanand dry. Nominal leakage rate plating of gold contact switchesmay be permanently damaged if thismechanism is used to switch circuitsabove the following limits:300V: 12mA Resistive24V: 2mH/200mA Inductive24V: 250mA Resistive24V: 750mH/10mA InductiveTYPE D6 For switching two independent : Double pole change over (2independent circuits): "Snap Action".TYPE P & P6As type D & D6 but with gold platedcontacts for switching low power ( safe) electrical TypeD & D6P & P6 H6 & B6 Contact materialFine silverGold platedGold C to + 400 C-100 C to + 250 CAmbient-30 C to + 70 C-60 C to + 70 CInsulation Value(live to earth) > 100 MEG OHMT erminals D,PM4 screws with non-rotational clamp platesD6, P6, H6, B66 way terminal block with pressure platesMax.

9 Voltage VMax. Current AMax. *2000 VAPower factor MinDC WattsTime constant 40ms Watts* Note : Max. current for Type D is up to 210 CLVD - Low Voltage DirectiveThese switches comply with theprovisions of the machinery directive89/392/EEC and the Low VoltageDirective 73/23 applied: EN60947 Parts 1and compression couplings to copper or nylon pipe (couplingthread " BSP).TEMPERATUREM edium +1 C + 400 CAmbient +1 C + 60 CLower ambient temperature can be toleratedprovided the air supply is 100% PURPOSE APPLICATIONSSPECIFICATIONSALUMINIUM BRONZE WETSIDE MODELSS01DB/F84S01D6B/F84 Weatherproof to IEC 144:IP66 UKLloyds Register of ShippingGermanyGermanischer Lloyd, T VCanadaCSAUSAABSF ranceBVItalyRINAR ussiaRMNorwayDNV6 Contact switch4 Contact switchMaximum temperature : dependent upon switch mechanism, gasket and gland - see pages 4 and 5 ELECTRICAL MODELSE nclosure & wetside:Aluminium bronze to BS1400 - AB1 max.

10 Iron content S01DB Aluminium BS1490 - grade LM24 End S01D6B Brass BS1400 - DCB3 Maximum temp:210 C except shrouded float. F93 = 180 OCAIR PILOT VALVE MODELSE nclosure:Aluminium Alloy to BS 1490 : Grade LM24 Valve block:Aluminium alloy to BS 1490 : Grade LM25 Finish:All external aluminium surfaces are chromate phosphate treated then externally painted.(air pilot valves only)Maximum temp:See page 5 for switch insertOther approvals available. Please contact us with your INFORMATIONCodeSGeneral purpose aluminium bronze wetside modelsSwitchCode01 Flange (Head)SizeMobrey ARating18 barStandardMobreyCodeDBPBD6BP6 BAPAAMAS witch mechanism4 Contact - general fi short end cap4 Contact - gold plated contacts fi short end cap6 Contact - general fi long end cap6 Contact - gold plated contacts fi long end capPneumatic on/offPneumatic modulatingCODEF84F185F68/+F264F21/+F104/ +F93 Float - application informationHigh or low alarm or 2 offfor pump control wide differentialHorizontal pump controlHorizontal limited differentialVertical.


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