DWYER – Series AT-3000MR/MRS ATEX/IECEx Approved Photohelic® Switch/Gage

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Series AT-3000MR/MRS ATEX/IECEx Approved Photohelic® Switch/Gage

3000MR or 3000MRS Series in Flameproof ATEX/IECEx Enclosures

Using solid state technology, the Series AT-3000MR/MRS ATEX/IECEx Approved Photohelic® Switch/Gage combines the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage. Gage reading is unaffected by switch operation and will indicate accurately even if power is interrupted. AT102-3000MR series employ versatile electromechanical relays with low amperage ratings-ideal for dry circuits. For applications requiring high cycle rates, choose AT102-3000MRS models with SPST (NO) solid state relays. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). All models provide both low and high limit control. Compatible with air and other non-combustible, non-corrosive gases. Flameproof enclosures are available with glass window which allows for viewing of set point needles and process pressure. Compatible with air and other non-combustible, noncorrosive gases.


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 measurement and switching
  • Pneumatic conveying
  • Air conditioning systems
  • Clean rooms
  • Fume exhaust systems



  • Service: Air and non-combustible, compatible gases.
  • Wetted Materials: Consult factory.
  • Housing Material: Aluminum.
  • Finishing: Texture epoxy coat RAL7015.
  • Accuracy: ±2% of FS at 70°F (21.1°C). ±3% on -0, -60 Pa and ±4% on -00 models.
  • Pressure Limits: See pressure limit chart on the catalog page.
  • Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C). Option LT low temperature to -20°F (28.8°C) (Note: Product temperature limits differ from case).
  • Power Requirements: 24 VDC, regulated ±10%.
  • Electrical Wiring: Screw terminals.
  • Mounting Orientation: Diaphragm in vertical position.
  • Enclosure Rating: IP66.
  • Process Connections: 1/8″ NPT female brass (SS optional).
  • Electrical Connections: Two 1/2″ NPT female. Cable gland not included.
  • Dial Size: 4″ (101.6 mm).
  • Set Point Adjustment: Adjustable knobs on face behind enclosure cover. Follow instructions and safety warnings to open cover.
  • Weight: 13.2 lb (6 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.



  • Switch Type: Each set point has 1 Form C relay (SPDT).
  • Relay Contacts: (resistive load) 1 Form C rated 1.0 A @ 30 VDC, 0.3 A @ 110 VDC or 0.5 A @ 125 VAC. Gold over clad silver – suitable for dry circuits.



  • Switch Type: Each set point has a solid state relay.
  • Switching Voltage: 20 to 280 VAC (47 to 63 Hz).
  • Switching Current: 1.0 amp (AC) max., 0.01 mA (AC) min., (2) SPST NO.



  • Gage reading unaffected by switch operation and will continue to read pressure even during power loss
  • Zero and range adjustments outside of gage means no disassembly in normal service
  • Solid-state design allows for switching in high cycle rate applications without degradation
  • Flameproof enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to process pressure and set point status
  • Increased response time at low pressures with LD port configuration







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