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Series 2000 Magnehelic

Series 2000 Magnehelic ®

Indicate Positive, Negative or Differential, Accurate within 2%

Magnehelic Series 2000
Magnehelic Series 2000

Select the Series 2000 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.

Note: May be used with Hydrogen. Order a Buna-N diaphragm. Pressures must be less than 35 psi.


Magnehelic Specifications

  • Service: Air and non-combustible, compatible gases. (Natural Gas option available.) Note:May be used with hydrogen. Order a Buna-N diaphragm. Pressures must be less than 35 psi.
  • Wetted Materials: Consult with us.
  • Housing: Die cast aluminum case and 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).
  • Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard gages only. See Overpressure Protection note on Catalog page.
  • Temperature Limits: 20 to 140°F.* (-6.67 to 60°C).Size:4″ (101.6 mm) diameter dial face.
  • Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
  • Process Connections: 1/8″ female NPT duplicate high and low pressure taps – one pair side and one pair back.Weight:1 lb 2 oz (510 g); MP & HP 2 lb 2 oz (963 g).
  • Standard Accessories: Two 1/8″ NPT plugs for duplicate pressure taps, two 1/8″ pipe thread to rubber tubing adapters and three flush mounting adapters with screws. (Mounting and snap ring retainer substituted for three adapters in MP & HP gage accessories.)
  • Agency Approval: RoHS. (Note: -SP models not RoHS approved.)
  • For applications with high cycle rate within gage total pressure rating, next higher rating is recommended. See Options Page.
  • *Low temperature models available as special option.

Magnehelic Features

  • 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.
    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.

Video of Magnehelic Features

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Available Models

Range - Inches of Water

2000-0range 0-0.50" w.c., minor divisions .01, calibrated for vertical scale position.
2000-00range 0-0.25" w.c., minor divisions .005, calibrated for vertical scale position.
2000-00Nrange .05-0-.2" w.c., minor divisions .005, calibrated for vertical scale position.
2001range 0-1.0" w.c., minor divisions .02.
2002range 0-2.0" w.c., minor divisions .05.
2003range 0-3.0" w.c., minor divisions .10.
2004range 0-4.0" w.c., minor divisions .10.
2005range 0-5.0" w.c., minor divisions .10.
2006range 0-6.0" w.c., minor divisions .20.
2008range 0-8.0" w.c., minor divisions .20.
2010range 0-10" w.c., minor divisions .20.
2015range 0-15" w.c., minor divisions .50.
2020range 0-20" w.c., minor divisions .50.
2025range 0-25" w.c., minor divisions .50.
2030range 0-30" w.c., minor divisions 1.0.
2040range 0-40" w.c., minor divisions 1.0.
2050range 0-50" w.c., minor divisions 1.0.
2060range 0-60" w.c., minor divisions 2.0.
2080range 0-80" w.c., minor divisions 2.0.
2100range 0-100" w.c., minor divisions 2.0.
2150range 0-150" w.c., minor divisions 5.0.

Range - Inches of Water - Zero Center

2300-0range 0.25-0-0.25" w.c., minor divisions .01, calibrated for vertical scale position.
2301range 0.5-0-0.5" w.c., minor divisions .02.
2302range 1-0-1" w.c., minor divisions .05.
2304range 2-0-2" w.c., minor divisions .10.
2310range 5-0-5" w.c., minor divisions .20.
2320range 10-0-10" w.c., minor divisions .50.
2330range 15-0-15" w.c., minor divisions 1.0.

Range - PSI

2201range 0-1 psi, minor divisions .02.
2202range 0-2 psi, minor divisions .05.
2203range 0-3 psi, minor divisions .10.
2204range 0-4 psi, minor divisions .10.
2205range 0-5 psi, minor divisions .10.
2210range 0-10 psi, minor divisions .20, MP option standard.
2215range 0-15 psi, minor divisions .50, MP option standard.
2220range 0-20 psi, minor divisions .50, MP option standard.
2230range 0-30 psi, minor divisions 1.0, HP option standard.

Dual Scale Air Velocity Units (w.c./Velocity ft/min)

2000-00AVrange 0-0.25" w.c., velocity 300-2000 FPM, calibrated for vertical scale position.
2000-0AVrange 0-0.50" w.c., velocity 500-2800 FPM, calibrated for vertical scale position.
2001AVrange 0-1.0" w.c., velocity 500-4000 FPM.
2002AVrange 0-2.0" w.c., velocity 1000-5600 FPM.
2010AVrange 0-10" w.c., velocity 2000-12500 FPM.

Range - MM of Water

2000-100MMrange 0-100 mm w.c., minor divisions 2.0.
2000-10MMrange 0-10 mm w.c., minor divisions .20, calibrated for vertical scale position.
2000-150MMrange 0-150 mm w.c.
2000-15MMrange 0-15 mm w.c.
2000-200MMrange 0-200 mm w.c.
2000-250MMrange 0-250 mm w.c.
2000-25MMrange 0-25 mm w.c., minor divisions .50.
2000-300MMrange 0-300 mm w.c.
2000-50MMrange 0-50 mm w.c., minor divisions 1.0.
2000-6MMrange 0-6 mm w.c., minor divisions .20, calibrated for vertical scale position.
2000-80MMrange 0-80 mm w.c., minor divisions 2.0.

Range - MM of Water - Zero Center

2300-20MMrange 10-0-10 mm w.c., minor divisions .50, calibrated for vertical scale position.

Range - CM of Water

2000-100CMrange 0-100 cm w.c., minor divisions 2.0.
2000-150CMrange 0-150 cm w.c., minor divisions 5.0.
2000-15CMrange 0-15 cm w.c., minor divisions .50.
2000-200CMrange 0-200 cm w.c., minor divisions 5.0.
2000-20CMrange 0-20 cm w.c., minor divisions .50.
2000-250CMrange 0-250 cm w.c., minor divisions 5.0.
2000-25CMrange 0-25 cm w.c., minor divisions .50.
2000-300CMrange 0-300 cm w.c., minor divisions 10.0.
2000-50CMrange 0-50 cm w.c., minor divisions 1.0.
2000-80CMrange 0-80 cm w.c., minor divisions 2.0.

Range CM of Water - Zero Center

2300-10CMrange 5-0-5 cm w.c., minor divisions .20.
2300-30CMrange 15-0-15 cm w.c., minor divisions 1.0.
2300-4CMrange 2-0-2 cm w.c., minor divisions .10.

Range - Pascals

2000-100PArange 0-100 Pa, minor divisions 2.0, calibrated for vertical scale position.
2000-125PArange 0-125 Pa, minor divisions 5.0, calibrated for vertical scale position.
2000-250PArange 0-250 Pa, minor divisions 5.0.
2000-300PArange 0-300 Pa, minor divisions 10.0.
2000-500PArange 0-500 Pa, minor divisions 10.0.
2000-60PArange 0-60 Pa, minor divisions 2.0, calibrated for vertical scale position.
2000-750PArange 0-750 Pa, minor divisions 25.0.

Range - Pascals - Zero Center

2300-100PArange 50-0-50 Pa, minor divisions 2.0, calibrated for vertical scale position.
2300-120PArange 60-0-60 Pa, minor divisions 2.0.
2300-250PArange 125-0-125 Pa, minor divisions 5.0.
2300-500PArange 250-0-250 Pa, minor divisions 10.0.
2300-60PArange 30-0-30 Pa, minor divisions 2.0, calibrated for vertical scale position.

Range - Kilopascals

2000-1.5KPArange 0-1.5 kPa, minor divisions .05.
2000-10KPArange 0-10 kPa, minor divisions .20.
2000-15KPArange 0-15 kPa, minor divisions .50.
2000-1KPArange 0-1 kPa, minor divisions .02.
2000-20KPArange 0-20 kPa, minor divisions .50.
2000-25KPArange 0-25 kPa, minor divisions .50.
2000-2KPArange 0-2 kPa, minor divisions .05.
2000-30KPArange 0-30 kPa, minor divisions 1.0.
2000-3KPArange 0-3 kPa, minor divisions .10.
2000-4KPArange 0-4 kPa, minor divisions .10.
2000-5KPArange 0-5 kPa, minor divisions .10.
2000-8KPArange 0-8 kPa, minor divisions .20.

Range - Kilopascals - Zero Center

2300-1KPArange 0.5-0-0.5 kPa, minor divisions .02.
2300-3KPArange 1.5-0-1.5 kPa, minor divisions .10.

Dual Scale - English/Metric

2000-0Drange 0-0.5" w.c. & 0-125 Pa.
2001Drange 0-1.0" w.c. & 0-250 Pa.
2002Drange 0-2.0" w.c. & 0-500 Pa.
2003Drange 0-3.0" w.c. & 0-750 Pa.
2004Drange 0-4.0" w.c. & 0-1.0 kPa.
2006Drange 0-6.0" w.c. & 0-1.5 kPa.
2008Drange 0-8.0" w.c. & 0-2.0 kPa.
2010Drange 0-10" w.c. & 0-2.5 kPa.
2015Drange 0-15" w.c. & 0-3.7 kPa.

2000-SP Set Point Indicator

2000-0-SPrange 0-0.50" w.c., with set point indicator.
2001-SPrange 0-1" w.c., with set point indicator.
2002-SPrange 0-2" w.c., with set point indicator.
2005-SPrange 0-5" w.c., with set point indicator.
2010-SPrange 0-10" w.c., with set point indicator.


Available Options

  • ASF Adjustable Signal Flag
  • HP High Pressure Option
  • LT Low Temperatures to -20°F
  • MP Med. Pressure Option
  • SP Setpoint Indicator
  • Scale Overlays Red, Green, Yellow, Mirrored or Combination, Specify Locations
  • Mounting
    A single case size is used for most models of Magnehelic® gages. They can be flush or surface mounted with provided standard hardware supplied. Although calibrated for vertical position, many ranges above 1″ may be used at any angle by simply re-zeroing. However for maximum accuracy, they must be calibrated in the same position in which they are used. These characteristics make Magnehelic® gages ideal for both stationary and portable applications. A 4-9/16″ hole is required for flush panel mounting. Complete mounting and connection fittings, plus instructions, are furnished with each instrument.