Series AT3A3000 ATEX/IECEx Approved Photohelic® Switch/Gages

Photohelic® Switch/Gages in Flameproof Enclosures

This Series is no longer available, please see Series AT-A3000 for the suggested replacement.

Please see Series A3000 for non-ATEX/IECEx approved.

California Residents:  Click Here for Proposition 65 WARNING.


Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
±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; (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 Type:
Each setpoint has 2 Form C relays (DPDT).
±1% of FS.
Electrical Rating:
10 A @ 120 VAC, 6 A @ 240 VAC, 60 Hz res. 10 A @ 28 VDC.
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:
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.
28.4 lb (12.9 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


Product Literature


Catalog Pages

Product Data Sheet




What restrictions, if any, are imposed for the Magnehelic® and Photohelic® gages in vacuum service?
In applications involving higher vacuums than 20" Hg, leakage due to gage housing porosity becomes the limiting factor.

Product Reviews

Only registered users can write reviews. Please Sign in or create an account