Dietz D-1


Adobe Acrobat Dietz D-1 Technical Specifications (284KB PDF)

  • Set Point Ranges: 0.7"–7.0" H20
  • Dead Band: Approximately 50% of Set Point
  • Proof Pressure: 30" H20
  • Mechanical Life: 1,000,000 Cycles
  • Temperature Range: +40–150°F
  • Housing Material: Anodized Aluminum
  • Diaphragm: Silicone Coated Fabric
  • Pressure Port: 0.312 ± .005 O.D. Tube
  • Electrical Connection: 0.058 Push-on Terminals
  • Weight: 0.32 lbs
  • Switch Type: SPDT Snap Action
  • Current Rating
    • 4 A 250 VAC / 5 A 28 VDC
  • Fabricated or sheet aluminum anodized in accordance with MIL-A-8625, Type 1, Class 2
  • Brass or steel machine parts are cadmium plated in accordance with Federal Specification QQ-P-416, Type II, Class 2
  • Weight: 5 ounces

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Differential Pressure Switch

The Dietz Model D-1 Ultra Sensitive Differential Pressure Switch is designed to operate in extreme environments at values as low as 0.7" H2O. The switch is actuated when pressure, vacuum, or differential pressure acts on the diaphragm, which in turn actuates a snap switch. The internal air volume required is minimal, allowing the switch to actuate without delay and with very little air displacement. The D-1's switch actuation point is adjustable and is easily increased by simply turning the adjustment nut clockwise. The snap switch is completely isolated from the pressure or vacuum media.

The Dietz D-1 will withstand high pressure overloads without physical damage or changes in calibration, and can be built to Military Specifications. The subminiature snap switch has a mechanical life of 95% survival after 18 million operations. The D-1's rugged flat plate construction employs a unique square diaphragm and high current ratings make electronic relays unnecessary. The D-1 is also available with gold contacts for use with low DC voltage and minimum current.


  • Rugged flat-plate construction in accordance with MIL-A-8625, Type 1, Class 2 specification
  • Adjustable pressure range from 0.7–7" H20
  • Single pole double throw switch action
  • High proof pressure
  • Reliable mechanical life


  • Forced air cooled electronic equipment to prevent damage from air flow failure
  • Indicate dirt accumulation on filters, blowers, exhaust fans
  • Sense internal pressures in radar domes
  • Sense interrupted flow

Model Number

Part Number

Pressure Range



0.7–7.0" H2