Series ADPS Differential Pressure Switch

Brand: Dwyer Instruments, LLC

The Series ADPS Adjustable Differential Pressure Switch is designed for pressure, vacuum, and differential pressures.

The dual scaled adjustment knob in inches water column and pascals allows changes to the switching pressure to be made without a pressure gauge.

The ADPS is available with settings from 0.08 in w.c. (20 Pa) up to 20 in w.c. (5,000 Pa).

The silicone diaphragm and PA 6.6 body make the series ADPS ideal for use with air and other noncombustible gases. The compact size, adjustment knob and low cost make the ADPS the perfect choice for HVac applications.
  • Adjustment know changes switching pressure easily with a pressure gauge reducing components for application
  • Low cost device makes it an excellent solution in BAS and HVac applications requiring duct control and monitoring
  • Relay contact allows simple integration with DDC or building systems


Adjustment Type

  • Field Adjustable

Approvals & Certifications

  • CE
  • RoHS

Deadband, Approximate

  • Inches WC: 0.05 to 1.4

Diaphragm Material

  • Silicone Rubber

Electrical Connectors

  • 1/2” NPT Female
  • M20 Female
  • Screw Terminal Block. M20 x 1.5 with Cable Strain Relief

Electrical Rating

  • 1.5 A at 250 Vac

Enclosure, Body Material

  • PA 6.6 & POM
  • Polystyrene

Environmental Protection

  • IP54
  • NEMA / IP54


  • Vertically, with Pressure Connections Pointing Downwards

O-Ring Material

  • Silicone Rubber

Process Temperature

  • -20° to 85° C (-4° to 185° F)

Proof Pressure

  • Inches WC: 40

Set Point - Decreasing

  • Inches WC: 0.08 to 20.0

Set Point - Increasing

  • Inches WC: 0.08 to 20.0

Switch Type

  • SPDT

System Pressure

  • 40” WC
  • Inches Hg: 2.95
  • kPa: 10

Tube Connection

  • 5/16˝ (7.94 mm) Outside Diameter Tubing, 1/4˝ (6.0 mm) Inside Diameter Tubing

  • Monitoring air filters and ventilators
  • Monitoring industrial cooling-air circuits
  • Overheating protection for fan heaters
  • Monitoring flows in ventilation ducts
  • Controlling air and fire-protection dampers
  • Frost protection for heat exchanges.

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