Dwyer 43000 Capsu-Photohelic Pressure Switch / Gages

Dwyer 43000 Capsu-Photohelic Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Capsu-Photohelic® switch/gage employs an encapsulated sensing element for use with both liquids and gases at pressures of 500 psig (34 bar).

Optional cast brass case is available for water or water-based liquids. Two phototransistors actuated, DPDT relays are included for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gauge face. Individual set point deadband is one pointer width — less than 1% of full scale. Setpoints can be interlocked to provide variable deadband — ideal for control of pumps.

Dwyer 43000 Capsu-Photohelic Features

  • Gage capsule permits high-pressure usage with small differentials
  • Zero and range adjustments outside of gage means no disassembly in normal service
  • Time-proven, simple, frictionless movement that permits full scale readings as low as 0.5 in w.c.
  • Photo-electronic relays provide fast-acting switching with variable deadband control for chatter-free operation


  • Pump control
  • Pumping systems
  • Waste water
  • Compatible liquid or gas applications

Dwyer 43000 Capsu-Photohelic Specification

Gage Specifications
Service Compatible gases and liquids. Brass case option required for water based liquids.
Wetted Materials Consult factory.
Accuracy ±3% of FS at 70°F (21.1°C). ±4% on 43215, 43220 and 43500.
Pressure Limits -20 Hg to 500 psig (-0.677 to 34.5 bar).
Temperature Limits 20 to 120°F (-6.67 to 48.9°C). Low temperature option available.
Process Connections 1/4″ female NPT.
Size 4″ (101.6 mm) dial face, 5″ (127 mm) OD x 9-3/16″ (233.36 mm).
Weight 5 lb. 8 oz (2.49 kg). Brass 11 lb. 2 oz (5.05 kg).
Switch Specifications
Switch Type Each setpoint has 2 form C relays (DPDT).
Repeatability ±1% of FS.
Electrical Rating 10 A @ 120 VAC, 6 A @ 240 VAC, 60 Hz res. 10 A @ 28 VDC.
Electrical Connections Screw terminals.
Power Requirements 120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional.
Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment Adjustable knobs on face.

Download Data Sheet: Series 43000 Capsu-Photohelic® Pressure Switch/Gage

Ref: dwyer-inst.com

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