Series AT1ADPS ATEX/IECEx Approved ADPS Adjustable Differential Pressure Switch

Brand: Dwyer Instruments, LLC

The ATEX approved Series AT1ADPS Adjustable Differential Pressure Switch is designed for pressure, vacuum, and differential pressure applications in hazardous areas.

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 switch is available with settings from 0.08 in w.c. (20 Pa) up to 16 in w.c. (4000 Pa). The silicone diaphragm makes this series ideal for use with air and other non-combustible gases.

Flame-proof ATEX enclosures are available in aluminum and can include a glass window for viewing set point status on adjustment knob.

Important notes for installation: 
  • Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument).
  • Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).
  • Open cover only after de-energizing instrument.
  • Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.
  • Flame-proof ATEX enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to set point status


Adjustment Type

  • Field Adjustable

Approvals & Certifications

  • ATEX
  • CE
  • IEC Ex

Diaphragm Material

  • Silicone

Electrical Connectors

  • M20 Female
  • Two 1/2” NPT Female

Electrical Rating

  • 1.5 A at 250 Vac

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP65 If the Overpressure Relief Valve is Selected
  • IP66

NPT Connection

  • 1/8” NPT Female

O-Ring Material

  • Silicone Rubber

Process Connection Material

  • 316 Stainless Steel
  • Brass

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

  • bar: 0.68
  • kPa: 68.95
  • psig: 10

Temperature Range

  • Process/Ambient: -20° Go 85° C (-4° to 185° F) Case: -60° to 50° C (-76° to 140° F)

  • Hazardous area pressure switch
  • Air filter and ventilator monitoring
  • Ventilation duct monitoring
  • Industrial cooling circuits
  • Fan heater overheating protection
  • Fire-protection damper control
  • Heat exchanger frost protection

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