Dwyer MP Mini-Photohelic Differential Pressure Switch/Gage

Dwyer MP Mini-Photohelic Differential Pressure Switch/Gage combines the time proven Minihelic® II differential pressure gage with two SPDT switching set points. The Mini-Photohelic® switch/gage is designed to measure and control positive, negative, or differential pressures consisting of non-combustible and non-corrosive gases. Gage reading is independent of switch operation. Switching status is visible by LED indicators located on the front and rear of the gage. Set points are adjusted with push buttons on the back of the unit.

Dwyer MP Mini-Photohelic Features

  • Gage reading unaffected by switch operation and will continue to read pressure even during power loss
  • Visible switch status LED provides indication of set point switching state
  • Compact design but with the power of larger devices can meet the same application specifications


  • Fume hoods
  • Dust collection
  • Pneumatic conveying
  • Clean room

Dwyer MP Mini-Photohelic Specification

Gage Specifications
Service Air and non-combustible, compatible gases.
Wetted Materials Consult factory.
Accuracy ±5% FS @ 70°F (21.1°C). Gage face mounted in vertical position.
Pressure Limits 30 psig (2.067 bar).
Temperature Limits 20 to 120°F (-6.7 to 49°C).
Process Connections Barbed for 3/16″ ID tubing (STD); 1/8″ male NPT (optional).
Size 4-1/8″ (104.78 mm) depth x 3-1/16″ (77.79 mm) diameter.
Weight 23 oz (652 g).
Switch Specifications
Switch Type SPDT relays.
Electrical Rating 5 A @ 120/240 VAC resistive; 5 A @ 30 VDC.
Electrical Connections Screw type terminal block. Accepts 22-12 AWG wire.
Power Requirements 24 VDC / 24 VAC 50/60 Hz 4 W.
Mounting Orientation Gage face in vertical position.
Set Point Adjustment Push buttons.
Standard Accessories (2) mounting screws, (1) .050″ hex allen wrench.
Agency Approvals CE, cULus.

Download Data Sheet: Series MP Mini-Photohelic® Differential Pressure Switch/Gage

Ref: dwyer-inst.com

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