Mid-West Instrument
Made in the USA
Tel: (586) 254-6500 · Fax: (586) 254-6509
6500 Dobry Dr., Sterling Heights, Michigan 48314
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Diaphragm Type Differential Pressure Gauges & Switches - Models 130, 140, 141, 142, 522, 700
MODEL 130 DIAPHRAGM TYPE
Lowest ∆P Range 0-5" H2O (0-12.4 mbar) to 0-400" H2O (0-1 bar)
Models 130, 140, 142, 522, 700

Product Features/Benefits

  • Diaphram Separation Between High & Low Side
  • Simple Rugged Designs
  • Glass Reinforced Thermoplastic Gauge Front is Standard
  • Weather Resistant & Corrosion Resistant Gauge Front
  • ±2%* or ±5% Full Scale Accuracy
  • 1-5 Year Warranty's
MODEL 140 DIAPHRAGM TYPE
Standard ∆P Range 0-25 PSID - 0-100 PSID (1.7 bar - 7 bar)
MODEL 142 DIAPHRAGM TYPE
Low ∆P Range 0-20" H2O (0-50 mbar)- 0-25 PSID (0-1.7 bar)
MODEL 522 DIAPHRAGM TYPE
Standard ∆P Range 0-5 PSID (0-0.35 bar)- 0-50 PSID (0-3.5 bar)

"NEW"MODEL 522 3-COLOR DIAL DIAPHRAGM TYPE
Standard ∆P Range 0-5 PSID (0-0.35 bar)- 0-50 PSID (0-3.5 bar)
MODEL 700
DIFFERENTIAL PRESSURE TRANSMITTER
Standard ∆P Range 0-5 PSID (0.35 bar) to 0-300 PSID (0-20.0 bar)
Diaphragm Type Differential PRessure Gauges & Switches - Models 130, 140, 141, 142, 522, 700
Differential Pressure Gauges and Switches for Every Need
Mid-West Instrument has been serving a variety of industries (Power, Chemical, Petro Chemical, HVAC, Water, Filtration) for over 45 years. Over 150,000 Diaphragm-type units have been produced bearing the Mid-West name or private branded for our OEM customers!

Mid-West’s forte is flexibility and quick response. Standard configuration can be customized and modified to suit a customer’s need for easy installation or retrofit. Differential Pressure is sensed by the movement of an elastomer diaphragm against a precision calibrated range spring. The change in position of the diaphragm in response to the change in Differential Pressure moves an internal magnet. This magnet, in turn, causes a rotary magnet external to the gauge body to rotate. This rotary magnet has a pointer attached which indicates the differential pressure on the dial.

Diaphragm-type Differential Pressure Gauges are available with one or two hermetically sealed reed switches. The switches are adjustable within a defined percentage of the full scale range of the gauge and are available in SPDT and SPST, normally open configurations for various load/power ratings. The switches can be set to activate or deactivate on rising or falling pressure. Switches are “CE” marked per the EU low voltage directive.

All Mid-West Diaphragm-type Differential Pressure Gauges can be configured for use in hazardous locations. All Hazardous Location Switches are both CSA and UL listed. The CSA & UL listings are for the entire assembly and not just the enclosure. Model 522 is not CSA or UL Listed.

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