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Magnehelic®
Differential Pressure Gauges|
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Indicate low air or gas pressures - positive, negative or differential.Select the Dwyer Magnehelic® gauge for high accuracy - guaranteed within 2% of full scale - and for the wide choice of 81 ranges available to suit your needs precisely. Using Dwyer's simple, frictionless Magnehelic® 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.Widely used 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. |
| Ambient Temperature Range | 20 to 140°F* |
| Rated Total Pressure | -20"Hg Vacuum to 15 PSIG Pressure** |
| Over Pressure | Relief plug opens at approximately 25 PSIG |
| Connections | 1/8" NPT femal
high and
low pressure taps,
duplicated - one pair side and one pair back |
| Housing | Die case
aluminum. Case
and aluminum parts
iridite-dipped to withstand 168 hour salt spray test. Exterior finish is baked dark gray hammerloid |
| Accuracy | ±2% of
full scale
(±3% on -0 and ±4% on -00 ranges),
thoughout range at 70°F |
| 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 ring and snap ring retainer substituted for 3 adapters in MP and HP gauge accessories) |
| Weight | 1 lb. 2 oz. |
| Adjustable Signal Flag
Integral with plastic gage cover; has external reset screw. Available for most ranges except those with medium or high pressure construction May be ordered with gauge, or separately. |
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| LED Setpoint Indicator
Bright red LED on right of scale shows when setpoint is reached. Field adjustable from gauge face, unit operates on 12-24 VDC. Requires MP or HP style cover and bezel |
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| Air Filter Gauge Accessory Kit
Adapts any standard Magnehelic® for use as an air filter gauge. Includes aluminum surface mounting plate with screws, two 5' lengths of ¼" aluminum tubing, two static pressure tips and two moulded plastic vent valves with integral compression fittings on both tips and valves. |
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| Portable Units
Combine carrying case with any Magnehelic® gauge of standard range (not high pressure). Includes 9' of 3/16" I.D. rubber tubing, stand/hang bracket and terminal tube with holder. |
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| High and Medium Pressure Models
Installation is similar to standard gauges except that a 4-13/16" hold is needed for flush mounting. The medium pressure construction is rated for internal pressures up to 35 psig and the high pressure up to 80 psig. Available in all ranges. Because of larger case, will not fit in portable case. Weight 1 lb., 10 oz. (Installation of the A-321 safety relief valve on standard Magnehelic® gauges often provides adequate protection against infrequent over pressure). |
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**Includes High Pressure Option |
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Phone: 604-254-9622
Fax: 604-254-3123
e-mail: info@johnsherman.com