Dwyer 2002D Magnehelic Differential Pressure Gauge

About Dwyer 2002D Magnehelic Differential Pressure Gauge

Dwyer 2002D Magnehelic Differential Pressure Gauge

Dwyer Instruments 2002D

Differential Pressure Gage 0-2.0 in H2O, 0-500 Pascals

Select the Magnehelic gage for high accuracy--guaranteed within 2% of full scale--and for the wide choice of 81 models available to suit your needs precisely. Using Dwyer's simple, frictionless Magnehelic gage movement, it quickly indicates low air or non-corrosive gas pressures--either positive, negative (vacuum) or differential. The design resists shock, vibration and over-pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. It's inexpensive, too. The Magnehelic gage is the industry standard to measure fan and blower pressures, filter resistance, air velocity, furnace draft, pressure drop across orifice plates, liquid levels with bubbler systems and pressures in fluid amplifier or fluidic systems. It also checks gas-air ratio controls and automatic valves, and monitors blood and respiratory pressures in medical care equipment.

Product Highlights

• Bezel provides flange for flush mounting in panel.

• Clear plastic face is highly resistant to breakage. Provides undistorted viewing of pointer and scale.

• Precision litho-printed scale is accurate and easy to read.

• Red tipped pointer of heat treated aluminum tubing is easy to see. It is rigidly mounted on the helix shaft.

• Pointer stops of molded rubber prevent pointer over-travel without damage.

• "Wishbone" assembly provides mounting for helix, helix bearings and pointer shaft.

• Jeweled bearings are shock-resistant mounted; provide virtually friction-free motion for helix. Motion damped with high viscosity silicone fluid.

• Zero adjustment screw is conveniently located in the plastic cover, and is accessible without removing the cover. O-ring seal provides pressure tightness.

• Helix is precision made from an alloy of high magnetic permeability. Mounted in jeweled bearings, it turns freely, following the magnetic field to move the pointer across the scale.

• Calibrated range spring is flat spring steel. Small amplitude of motion assures consistency and long life. It reacts to pressure on diaphragm. Live length adjustable for calibration.

• Silicone rubber diaphragm with integrally molded O-ring is supported by front and rear plates. It is locked and sealed in position with a sealing plate and retaining ring. Diaphragm motion is restricted to prevent damage due to overpressures.

• Die cast aluminum case is precision made and iridite-dipped to withstand 168 hour salt spray corrosion test.

• Exterior finished in baked dark gray hammerloid. One case size is used for all standard pressure options, and for both surface and flush mounting.

Overpressure Protection

Blowout plug is comprised of a rubber plug on the rear which functions as a relief valve by unseating and venting the gage interior when over pressure reaches approximately 25 PSIg (1.7 bar). To provide a free path for pressure relief, there are four spacer pads which maintain 0.023" clearance when gage is surface mounted. Do not obstruct the gap created by these pads. The blowout plug is not used on models above 180" of water pressure, medium or high pressure models, or on gages which require an elastomer other than silicone for the diaphragm. The blowout plug should not be used as a system overpressure control. High supply pressures may still cause the gage to fail due to over pressurization, resulting in property damage or serious injury. Good engineering practices should be utilized to prevent your system from exceeding the ratings or any component.

O-ring seal for cover assures pressure integrity of case. Samarium Cobalt magnet mounted at one end of range spring rotates helix without mechanical linkages.

• Range 0-2.0 in H2O

• 0-500 Pa

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Precision Measurement for Critical Applications

Engineered for use in HVAC, clean rooms, ducts, and filter monitoring, the Dwyer 2002D Magnehelic Gauge ensures precise differential pressure readings for steam, oil, or gas. Its analog display allows easy on-site verification, and the 2% full-scale accuracy meets industrial standards. The robust construction makes it ideal for harsh environments and continuous monitoring.


Durable and Flexible Installation

Constructed with a die-cast aluminum case and a scratch-resistant acrylic lens, the 2002D gauges are built to last. Surface or panel mounting options, coupled with supplied accessories like mounting hardware, pressure tips, and tubing, ensure simple and versatile installation in a variety of industrial settings.


Effortless Operation and Quick Adjustments

With a clear analog dial, external zero adjustment, and a rapid 1-second response, the gauge facilitates quick pressure checks and easy recalibration during use. The IP54 protection allows for reliable use in environments where dust and moisture could otherwise pose a risk to sensitive measurement devices.