Dwyer Series AT23000MR/3000MRS Photohelic® Switch/Gage

Part Number: Series AT23000MR/3000MRS Categories: ,

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Using solid-state technology, the Dwyer Series AT23000MR/AT23000MRS ATEX/IECEx Approved Photohelic® Switch/Gages combine 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. AT23000MR series employ versatile electromechanical relays with low amperage ratings-ideal for dry circuits. For applications requiring high cycle rates, choose AT23000MRS 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, they can be used in systems with pressures to 25 PSIG (1.725 bar). Optional construction is available for 35 psi (2.42 bar) or 80 psi (5.51 bar). 

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 to keep IP66rating (IP65 with option OPV, overpressure relief valve).
• Open cover only after de-energizing instrument.
• Attention: Check local safety rules and warnings on the unit and manual to correct the instrument’s correct use in the hazardous area.

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.
Accuracy : ±2% of FS at 70°F (21.1°C). ±3% on -0, -60 Pa and ±4% on -00 skus.
Pressure Limits : -20 in Hg to 25 psig (-0.677 bar to 1.72 bar). MP option: 35 psig (2.41 bar), HP option: 80 psig (5.52 bar).
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 the case).
Power Requirements: 24 VDC, regulated ±10%.
Electrical Wiring: Screw terminals.
Mounting Orientation: Diaphragm in vertical position.
Dial Size : 4″ (101.6 mm).
Set Point Adjustment: Adjustable knobs on the face behind the enclosure cover. Follow instructions and safety warnings to open the cover.

Switch Type : Each setpoint 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 setpoint 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.
Enclosure Rating: IP66. IP65 with option OPV, overpressure relief valve.
Housing Material: Aluminum.
Finishing: Texture epoxy coat RAL7038.
Pressure Connections: 1/8″ NPT female brass (SS optional). In presence of acetylene, it is necessary to use SS.
Electrical Connections: Two 1/2″ FNPT. Cable gland not included.
Weight : 12.5 lb (5.7 kg).
ATEX Certificate: BVI 14ATEX0072.
Agency Approvals: ATEX Compliant CE 1370 Ex II 2G Ex d IIC T6 Gb / II 2D Ex tb IIIC T85°C Db, -60°C=Tamb=+60°C IECEx Compliant: Ex d IIC T6 Gb / Ex tb IIIC T85°C Db

  • 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
  • Flame-proof ATEX 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


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