This compact version in Switzer series 900 PressureSwitches using components of high reliability isspecifically designed for OEMs.

The sensing element is a hydraulically formedseamless Phosphor Bronze or Stainless SteelBellows mounted external to the weatherproofswitch housing.

The mechanical movements are restricted to absoluteminimum which ensures long term stability.

Style GH Pressure Die Cast Aluminium housing isbest suited for harsh and outdoor mountings.

The instrument is suitable for air, gas, water, steam, oiland several other chemicals which are compatible toCopper alloys and Stainless Steel.

Repeatability 0.5% FSR (Note 1)Range Setting External with lockRanges & MWP Vacuum to 32 bar, several

standard ranges. Refer OrderingMatrix (Note 2 & 3)

Differential SPDT Switch (Note 4 & 5) Fixed : within 6%

Narrowband adjustable : 6 to 20%Wideband adjustable : 10 to 60%

2 SPDT Switch (Note 6)Fixed : 10%Narrowband adj. : Not availableWideband Adjustable : 15 to 60%

Switching Instrument quality snap actingmicroswitch.

Switch Rating 15A, 250V ACSensor / Wetted Parts Phosphor Bronze Bellows with

Brass connector or 316 LSSBellows with 316 SS connector

Process Connection 1/4" NPT(F) standard. Adaptorsfor other threads optional

Maximum Fluid 110C for Phosphor Bronze Temperature Bellows, 170C for SS Bellows

(Note 6)

Ambient Temperature ()10 to 60CElectrical Connection 3/4" ET PVC Cable gland for

8 mm OD cable, standardMetallic double compressionCable Gland optional.

Mounting On-line / WallWeight 600 Gms.

GENERAL SPECIFICATIONS

PRINCE 901 IN GH ENCLOSURE

PRESSURE SWITCHES LOW COSTWEATHERPROOFPrincePrincePrincePrincePrince SERIES

zzzzz HIGH REPEATABILITY zzzzz SPRING OPPOSED BELLOWS zzzzz COMPACT zzzzzzzzzz TAMPER PROOF SETPOINT ADJUSTMENT zzzzz

QS Accreditation

ORDERING MATRIX

Example GH 901 1 V 3HOUSING

Pr. Die Cast Al. weatherproof to IP:66 GHON-OFF DIFFERENTIAL

Fixed 901Narrowband Adjustable 902Wideband Adjustable 903

MATERIAL OF SENSOR AND WETTED PARTSPhosphor Bronze Bellows with Brass connector1316L SS Bellows with 316 SS connector 2

RANGERange (in bar) MWP (in bar)()1 to 0 4 V0.2 to 1.6 9 A0.4 to 4 9 B0.7 to 7 18 C1.0 to 10 18 D1.6 to 16 25 E4.0 to 25 36 F8.0 to 32 36 G

SWITCH CODE SPDT, 15A, 250V AC 32 SPDT, 15A, 250V AC 33(DPDT not available in Narrowband Adjustable version 902)

DC Rating Resistive : 0.6A 110V / 0.3A 220V / 6A 24V Inductive : 0.1A 110V / 0.04A 220V / 4A 24V

1. Accuracy and repeatability are same for a Pressure Switch, whichis a switching device and not a measuring instrument.

2. Select working range of the instrument such that the set pressurelies between 35% to 70% of range span.

3. On and off settings should not exceed the upper or lower rangevalue.

4. Switching differentials are at midscale and will vary with rangesetting and operating conditions.

5. A pressure switch is a switching device and not a measuringinstrument eventhough it has a scale to assist setting. For thisreason, Test Certificates will not contain individual ON-OFF switchingvalues at different scale readings. Maximum differential obtainedalone will be declared, besides other specifications.

6. DPDT action is achieved by 2 SPDT switches synchronised topractical limits i.e., 2% of FSR.Contact life of microswitches are 5 105 switching cycles fornominal load. To quench DC sparks, use diode in parallel withinductance, ensuring polarity. A RC network is alsorecommended with R value in Ohms equal to coil resistanceand C value in micro Farads equal to holding current in Amps.

7. Higher process temperatures can be brought down by using longerpressure piping. Ask for piping nomogram # 4411844.Ensure that impulse pipework applies no stress on sensingelement housing and use spanners to hold pressure port / housingwhen connections are made.

8. Style GH is weatherproof only if all entries and joint faces areproperly sealed.

9. A more versatile and wide range of Pressure & Differential PressureSwitches are available in Series 200, 020, 300, 231 & Sovereignseries upto 600 bar.

10. Accuracy figures are exclusive of test equipment toleranceon the claimed values.

11. All performance data guaranteed 5%.

NOTES

#120

4 Pr

ince

900

Rev

.2

MOUNTING DIMENSIONS

GH 901 / 903 GH 902

All dimensions are in mm

24 115104

24

81 90

522

35

8 36

23

3/4" ET PVCCABLE GLAND

MOUNTINGLUGS 4.2 FIXING

HOLES 4 NOS.

1/4" NPTFPROCESSCONNECTION

SENSINGELEMENT

(BELLOWS)

DIMENSION 52 WILL BE 42 FOR CERTAIN RANGES

55

45

DIFFL. ADJ.

Prior notification of changes in specifications is impracticable due to continuous improvement.

FOR SWITZER'S OFFICES IN INDIACHECK AT:

http://www.switzerinstrument.com/offices.htm