DWYER Series AT-ADPS ATEX/IECEx Approved Differential Pressure Switch

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Series AT-ADPS ATEX/IECEx Approved Differential Pressure Switch

The ADPS in Flameproof ATEX/IECEx Enclosure

The Series AT-ADPS ATEX/IECEx Approved 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 gage. The switch is available with settings from 0.08 in w.c. (20 Pa) up to 20 in w.c. (5000 Pa). The silicone diaphragm makes this series ideal for use with air and other noncombustible gases. Flameproof enclosures are available in aluminum and can include a glass window for viewing set point status on the adjustment knob.

Important notes for installation:
• Cables must be fitted through 1/2″ NPT cable gland or ATEX/IECEx conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to maintain IP66 rating.
• 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 areas.


Product Applications

  • 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



  • Flameproof enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to set point status
  • Increased response time at low pressures with LD port configuration



  • Service: Air and non-combustible, compatible gases.
  • Wetted Materials: Diaphragm material: Silicone; Housing material: Switch body: PA 6.6 and POM; Cover: Polystyrene; Brass or SS depending on pressure connections chosen.
  • Temperature Limits: Process and ambient temperature from -4 to 185°F (-20 to 85°C) (Note: Product temperature limits differ from case).
  • Pressure Limits: See pressure limit chart.
  • Switch Type: SPDT.
  • Electrical Rating: Standard: Max. 1.5 A @ 250 VAC, max. switching rate: 6 cycles/min.
  • Set Point Adjustment: Hand knob on pressure switch inside case. (De-energize before opening case).
  • Mounting Orientation: Vertically, with pressure connections pointing downwards.
  • Mechanical Working Life: Over 106 switching operations.
  • Enclosure Rating: IP66.
  • Housing Material: Aluminum.
  • Finishing: Texture epoxy coat RAL7015.
  • Process Connections: 1/8″ NPT female brass (SS optional).
  • Electrical Connections: Two 1/2″ NPT female. Cable gland not included.
  • Weight: 10.4 lb (4.7 kg).
  • ATEX Certificate:
  • INERIS 21ATEX0033X.
  • IECEx Certificate:
  • IECEx INE 21.0064X.
  • Agency Approvals:
  • ATEX Compliant: CE 0080 EX II 2G Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) II 2D Ex tb IIIC T75 °C Db;
    IECEx Compliant: Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) Ex tb IIIC T75°C Db.