Dwyer Magnehelic - Model Series 2000 -Differential Pressure Gages

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.

• 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.
• Samarium Cobalt magnetmounted at one end of range spring rotates helix without mechanical linkages.
• 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.
• Blowout plugof silicone rubber protects against overpressure on 15 psig rated models. Opens at approximately 25 psig.
• O-ring sealfor cover assures pressure integrity of case.

• Service: Air and non-combustible, compatible gases. (Natural Gas option available.)
• Wetted Materials: Consult factory.
• 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 full scale (±3% on -0, -100PA, -125PA, -10MM and ±4% on -00, -60PA, -6MM ranges), throughout range at 70°F (21.1°C).
• Pressure Limits: -20" 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.
• Temperature Limits: 20 to 140°F.*(-6.67 to 60°C).
• 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 adapterswith screws. (Mounting and snap ring retainer substituted for 3 adapters in MP & HP gage accessories.)

• ASFAdjustable Signal Flag
• HPHigh Pressure Option
• LTLow Temperatures to -20°F
• MPMed. Pressure Option
• SPSetpoint Indicator
• Scale OverlaysRed, Green, Yellow, Mirrored or Combination, Specify Locations

Accessories:

• A-299 - Mounting bracket, flush mount Magnehelic® gage in bracket. Bracket is then surface mounted. Steel with gray hammertone epoxy finish.
• A-300 - Flat aluminum bracket for flush mounting Magnehelic® gage.
• A-310A - 3-way vent valve, plastic, 1/8" NPT to 1/4" metal tubing, 80 psi rating, replaces former Model A-310 (brass).
• A-432 - Plastic carrying case for Magnehelic® gage of standard range, except high pressure connection, includes 9 ft (2.7m) of 3/16" ID rubber tubing, stand-hang bracket & terminal tube with holder.
• A-321 - Brass safety relief valve, protects Magnehelic® gage or Photohelic® switch/gage against over pressure due to regulator failure, etc, opens at 10 psi. Mounts in tee fitting. 1/4" NPT(M) (use two for DP application).