Series AT2DH3 ATEX/IECEx Approved DH3 Differential Pressure Controller

3 in 1 Instrument: Gage, Switch, and Transmitter, Flame-Proof Enclosure

This Series is no longer available, please see Series AT-DH3 for the suggested replacement.

Please see Series DH3 for non-ATEX/IECEx approved.

California Residents:  Click Here for Proposition 65 WARNING.


Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
Housing Material:
Die cast aluminum case and bezel.
< 5 in w.c. (except ±2.5 in w.c.): ±1%; All other ranges: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
< ±1% per year.
Pressure Limits:
Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5", 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 9 psi.
Temperature Limits:
32 to 140°F (0 to 60°C)
(Note: Product temperature limits differ from case).
Compensated Temperature Limits:
32 to 140°F (0 to 60°C).
Thermal Effects:
0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements:
12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
Power Consumption:
3 VA max.
Output Signal:
4 to 20 mA DC into 900 Ω max.
Zero & Span Adjustments:
Accessible via menus in safe zone only.
Response Time:
250 ms (damping set to 1).
Backlit 4 digit LCD 0.4" height LED indicators for set point and alarm status.
Electrical Wiring:
Screw terminal.
Mounting Orientation:
Mount unit in vertical plane.
Dial Size:
5" (127 mm) OD x 3-1/8" (79.38 mm).
Enclosure Rating:
(IP66). IP65 with option OPV, overpressure relief valve.
Housing Material:
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.
12.3 lb (5.6 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
Switch Type:
2 SPDT relays.
Electrical Rating:
1 A @ 30 VAC/VDC.
Set Point Adjustment:
Adjustable via keypad on face in safe zone only.


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