![]() The blowout plug should not be used as a system overpressure control. 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. Do not obstruct the gap created by these pads. To provide a free path for pressure relief, there are four spacer pads which maintain 0.023″ clearance when gage is surface mounted. One case size is used for all standard pressure options, and for both surface and flush mounting.īlowout 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). Exterior finished in baked dark gray hammerloid.Die cast aluminum case is precision made and iridite-dipped to withstand 168 hour salt spray corrosion test.Diaphragm motion is restricted to prevent damage due to overpressures. It is locked and sealed in position with a sealing plate and retaining ring. Silicone rubber diaphragm with integrally molded O-ring is supported by front and rear plates.Small amplitude of motion assures consistency and long life. Calibrated range spring is flat spring steel.Mounted in jeweled bearings, it turns freely, following the magnetic field to move the pointer across the scale. Helix is precision made from an alloy of high magnetic permeability.Zero adjustment screw is conveniently located in the plastic cover, and is accessible without removing the cover.Motion damped with high viscosity silicone fluid. Jeweled bearings are shock-resistant mounted provide virtually friction-free motion for helix.“Wishbone” assembly provides mounting for helix, helix bearings and pointer shaft.Pointer stops of molded rubber prevent pointer over-travel without damage.It is rigidly mounted on the helix shaft. Precision litho-printed scale is accurate and easy to read.Provides undistorted viewing of pointer and scale. Clear plastic face is highly resistant to breakage.Bezel provides flange for flush mounting in panel.It also checks gas-air ratio controls and automatic valves, and monitors blood and respiratory pressures in medical care equipment 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. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. The design resists shock, vibration and over-pressures. Using Dwyer’s simple, frictionless Magnehelic gage movement, it quickly indicates low air or non-corrosive gas pressures–either positive, negative (vacuum) or differential. 1 lb 2 oz (510 g),MP & HP 2 lb 2 oz (963 g)Ģ000-60PA-ASF Dwyer Instruments 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.
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