Dwyer Series AT3A3000

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.


Service: Air and non-combustible, compatible gases.

Wetted Materials: Consult factory.

Accuracy: ±2% of FS at 70°F (21.1°C); ±3% on -0 and ±4% on -00 models.

Pressure Limits: -20 in Hg to 25 psig (-0.677 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) LT low temperature option to -20°F available; Case: -58 to 140°F (-50 to 60°C) (Note: Product temperature limits differ from case).

Dial Size: 4″ (101.6 mm).

Mounting Orientation: Diaphragm in vertical position.

Set Point Adjustment: Adjustable knobs on Photohelic® gage face behind enclosure cover. Follow instructions and safety warnings to open cover.


Switch specifications

Switch Type: Each setpoint has 2 Form C relays (DPDT).

Repeatability: ±1% of FS.

Electrical Rating: 10 A @ 28 VDC, 10 A @ 120, 240 VAC.

Electrical Wiring: Screw terminals.

Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional.

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: Three 1/2″ FNPT. Cable gland not included.

Weight: 28.4 lb (12.9 kg).

ATEX Approved Products from Comhas with ECN: NEMKO 10ATEX1096.

Agency Approvals: CE 0470 II2 GD Ex d IIC Gb T6; -50°C ≤ Ta ≤ +60°C Ex tb IIIC Db T 85°C.