Dwyer Series AT22000 Magnehelic® Differential Pressure Gage

Dwyer Company Headquarters is in Michigan City, Indiana. Dwyer uses advances computer modeling software to simulate real world situations, creating more accurate measurement techniques in our products. Innovative product designs have been recognized by industry experts, including ACHR Dealer Design Awards in the Testing and Monitoring category for 2014 and 2015.

Dwyer Series AT22000 Magnehelic® Differential Pressure Gage

Dwyer has invested in state of the art research and development facilities for best in class product testing and verification. Dwyer has a long history of innovation in designing and manufacturing our own measurement sensors that provide superior product performance.

Series AT22000 Magnehelic® Differential Pressure Gage

Known for quality, reliability and accuracy, Dwyer designs and manufactures a full-line of Controllers, Data Loggers, Gages, Manometers, Monitors, Remote Displays, Switches, Transmitters, and Accessories to measure, monitor and control pressure, air velocity, flow, fan pressure, duct, and more.

Dwyer’s wide selection extends to Gages, Transmitters, Switches, Data Loggers, and Monitors for Differential Pressure. Dwyer manufactures a range of dial and digital gages to reliably measure and display pressure difference, between two pressure sources using gas or liquid in a process flow.

Pressure, flow and piston-type gages are all found within this category. Clean design, small size and low cost with enough accuracy for all but the most demanding applications, these gages are the best around. Gages are indicators for the difference between two pressures or simply a single pressure.

The popular Series AT22000 Magnehelic® Differential Pressure Gage is now available in a flame-proof enclosure with the new ATEX/IECEx approved AT22000 Series. This gage can indicate positive, negative or differential pressures and is accurate within 2%.


  • ATEX housing provides all the capabilities and value of the Magnehelic® in a flame & explosion proof enclosure
  • Quick response to pressure changes means no delay in assessing critical situations
  • Durable and rugged housing and high-quality components combined provides long-service life and minimized down-time
  • High impact strength and high temperature rated for applications where hazardous environments exist


  • Fan and blower pressures
  • Filter resistance
  • Air velocity
  • Furnace draft
  • Liquid levels with bubbler systems
  • Pressure in fluid amplifier or fluidic systems


ServiceAir and non-combustible, compatible gases.
Wetted MaterialsConsult factory.
Magnehelic® HousingDie cast aluminum case & bezel with acrylic cover; Exterior finish is coated gray to withstand 168 hour salt spray corrosion test.
Accuracy±2% of FS (±3% on -0, -100PA, -125PA, -10MM and ±4% on -00, -60PA, -6MM ranges), throughout range at 70°F (21.1°C).
Pressure Limits-20 in Hg to 15 psig (-0.677 bar to 1.034 bar); MP option; 35 psig (2.41 bar), HP option; 80 psig (5.52 bar).
OverpressureRelief plug opens at approximately 25 psig (1.72 bar), standard gages only.
Temperature Limits20 to 140°F (-6.67 to 60°C); Low temperature option: -20°F (-28.8°C); (Note: Product temperature limits are less than case limits).
Mounting OrientationDiaphragm in vertical position.
Enclosure RatingIP66. IP65 with option OPV, overpressure relief valve.
Housing materialAluminum.
FinishingTexture epoxy coat RAL7038.
Pressure Connections1/8" NPT female brass (SS optional). In presence of acetylene it is necessary to use SS.
Weight8.6 lb (3.9 kg).
ATEX CertificateBVI 14ATEX0072.
Agency ApprovalsATEX 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

Ref: dwyer-inst.com 

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