9WPS Explosion Proof Compact Pressure Switch



  • Suitable for hazardous locations including safety panels and with pumps and gas compressors, turbines and other oil & gas applications


  • Vac to 10,000 psi pressure range
  • Explosion proof SPDT or DPDT switch
  • Stainless steel with FKM and PTFE wetted parts
  • ANSI dual seal design
  • Diaphragm seal/piston sensor
  • Safe to adjust during operation
  • Lockable setpoint wheel to avoid shifting during operation
  • ±2% of full scale accuracy
  • NEMA 4X, 7 & 9 enclosure rating
  • CSA approved for hazardous locations
  • Designed for sour gas applications requiring NACE standards MR0175-2009
  • CRN pending (up to 3,000 psi models)
  • 5 year warranty


Housing Material 316 SS
Port Material 316 SS
Accuracy ±2% of full scale
Pressure Connection 1/4” NPTF (1/2″ NPTM optional)
Electrical Connection 1/2″ NPTM, 18 AWG, 18″ (457 mm) free leads
Wetted Parts

Vacuum and low pressure – seals: FKM diaphragm

High pressure – piston: SS with PTFE backup ring and FKM o-ring

Set Point Adjustment Internal adjustment wheel with built in locking set-screws (#6)1
Deadband Fixed
Contact Rating

11 amps @ 125/250 Vac

5 amps @ 30 Vdc

No. of Contacts 1 x SPDT (2 x SPDT optional)
Vibration 10 g 10-500 Hz, MIL-STD-202F
Shock 50 g, 11 ms, MIL-S-901C
EMI/RFI Protection EN55011
Ambient Temperature -40°F to 149°F (-40°C to 65°C)
Enclosure Rating NEMA 4X, 7 & 9

CSA (Canada and USA) approved for use in hazardous locations Class I, Div. 1, Groups B, C & D;

Class II, Div. 1, Groups E, F & G

CRN registered (up to 3,000 psi model)
ANSI dual seal compliant
NACE MR0175-2009 compliant

Typical Life 2.5 million cycles
Weight 1.85 lbs (839 grams)

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