Dwyer 2000-100PA Magnehelic Differential Pressure Gauge

Dwyer 2000-100PA Magnehelic Differential Pressure Gauge

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Dwyer 2000-100PA Magnehelic Differential Pressure Gauge

Series 2000 Magnehelic Differential Pressure Gage, 0-100 Pa, Minor Divisions 2.0, Vertical

Indicate Positive, Negative or Differential

Select the Magnehelicテつョ gagefor high accuracy-guaranteed. Using Dwyer's simple, frictionless Magnehelicテつョ gage movement, it quickly indicates low air or non-corrosive gas pressures. 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テつョ 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 Applications

  • Filter Monitoring
  • Air Velocity with Dwyer Pitot Tube
  • Blower Vacuum Monitoring
  • Fan Pressure Indication
  • Duct, Room or Building Pressures
  • Clean Room Positive Pressure Indication


  • RoHS Certificate
  • GOST-R Certificate


  • Bezelprovides flange for flush mounting in panel.
  • Clear plastic faceis highly resistant to breakage. Provides undistorted viewing of pointer and scale.
  • Precision litho-printed scaleis accurate and easy to read.
  • Red tipped pointerof heat treated aluminum tubing is easy to see. It is rigidly mounted on the helix shaft.
  • Pointer stopsof molded rubber prevent pointer over-travel without damage.
  • "Wishbone" assemblyprovides mounting for helix, helix bearings and pointer shaft.
  • Jeweled bearingsare shock-resistant mounted; provide virtually friction-free motion for helix. Motion damped with high viscosity silicone fluid.
  • Zero adjustment screwis conveniently located in the plastic cover, and is accessible without removing the cover. O-ring seal provides pressure tightness.
  • Helixis 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 springis 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 diaphragmwith 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 caseis 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 plugis 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 sealfor cover assures pressure integrity of case.
  • Samarium Cobalt magnetmounted at one end of range spring rotates helix without mechanical linkages.


ServiceAir and non-combustible, compatible gases
HousingDie cast aluminum case and bezel, with acrylic cover, Exterior finish is coated gray to withstand 168 hour salt spray corrosion test
Pressure Limits-20 in Hg. to 15 psig.テ「ツ (-0.677 bar to 1.034 bar)
OverpressureRelief plug opens at approximately 25 psig (1.72 bar), standard gages only
Temperature Limits20 to 140テつーF
Mounting OrientationDiaphragm in vertical position
Process Connections1/8" female NPT duplicate high and low pressure taps - one pair side and one pair back
Weight1 lb 2 oz (510 g)
Standard AccessoriesTwo 1/8" NPT plugs for duplicate pressure taps, two 1/8" pipe thread to rubber tubing adapters and three flush mounting adapterswith screws
Agency ApprovalRoHS
Size4" (101.6 mm) diameter dial face