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White rectangular differential pressure gage with 4-inch dial and 1/8 NPT connections

Dwyer Instruments Inc.

Dwyer Instruments A3003 differential pressure gage 0-3.0" w.c

SKU CH-QTYP-XH51N

Measures differential pressure from 0 to 3.0 inches water column with ±2% accuracy at 70°F and 10 A DPDT relay switching

  • TypeElectronic
  • Accurate readings within ±2% at 70°F full scale
  • Dual DPDT relays rated 10 A at 28 VDC and 120/240 VAC
  • Measures differential pressure from 0 to 3.0" w.c. with 0.1 minor divisions
  • Operates on 110 VAC at 50/60 Hz across 20 to 120°F ambient range
  • CE, UL and CSA listed for air and non-combustible gas compatibility

Dwyer A3003 Differential Pressure Gage

The Dwyer A3003 is a differential pressure gage designed for monitoring air and non-combustible gas systems. It provides a measurement range of 0-3.0 inches water column with a minor division of 0.1 for precise readings. The unit features a 4-inch dial and operates on 110 VAC at 50/60 Hz. It is built for professionals who require reliable pressure indication in HVAC or industrial environments.

2 DPDT Relay and CE/UL/CSA Compliance

The integrated 2 DPDT relay is rated at 10 A for 28 VDC and 10 A at 120/240 VAC, enabling direct control of alarms or equipment based on pressure thresholds. CE, UL, and CSA listings confirm the device meets recognised safety standards for electrical equipment. Instructions are included to support proper installation and wiring. These features allow the gage to function as both an indicator and a control switch in a single package.

0-3.0" w.c. Range with 20 in Hg to 25 PSIG Static

The gage comfortably handles differential pressures up to 3.0 inches water column with an accuracy of +/-2% of full scale at 70 degrees Fahrenheit. It withstands a rated total pressure of 20 inches Hg to 25 PSIG, providing headroom for static line pressure. The 1/8 inch NPT connections suit standard instrumentation fittings. It is not suited for applications requiring ranges beyond 3.0 inches water column or for use with combustible gases.

Highlights

  • Accurate readings within ±2% at 70°F full scale
  • Dual DPDT relays rated 10 A at 28 VDC and 120/240 VAC
  • Measures differential pressure from 0 to 3.0" w.c. with 0.1 minor divisions
  • Operates on 110 VAC at 50/60 Hz across 20 to 120°F ambient range
  • CE, UL and CSA listed for air and non-combustible gas compatibility

Specifications

BrandDWYER INSTRUMENTS
TypeElectronic

Questions about this item

How often should the 1/8" NPT connections be checked for leaks during long-term use?

Inspect the 1/8" NPT fittings at each scheduled maintenance interval to verify seal integrity under the 20 In Hg to 25 PSIG rated total pressure range.

What limits continuous operation at the 3.0" w.c. upper range?

The +/-2% full-scale accuracy at 70°F and the 20–120°F ambient operating range define the measurement envelope; sustained pressure at 3.0" w.c. remains within the 25 PSIG rated total pressure limit.

How much heat does the 110 VAC 50/60 Hz supply generate during all-day running?

The unit draws 110 VAC at 50/60 Hz; with relay contacts rated 10 A at 28 VDC and 10 A at 120/240 VAC, heat output stays low and is managed within the 20–120°F ambient specification.

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