Mid-West Instrument Differential Pressure Gauges & Switches

The differential pressure is sensed by either an elastomer diaphragm or a precision ground piston, which moves an internal magnet to reflect the change in pressure and to open/close contacts of a sealed reed switch.

Mid West Model 121 Piston Type Differential Pressure Gauge 0 30 Kpa Cmc

CMC Technologies is the sole and exclusive distributor (since 1999) for Mid-West Instrument in Australia and New Guinea. We hold stocks of DP Gauges and back flow test kits in Sydney and are the only Factory Authorised Calibration and Service centre in South East Asia.

Piston Type Differential Pressure Gauges

In Piston Type DP gauges, differential pressure is sensed by the movement of a precisely ground floating piston/magnet in a precision bore against a calibrated spring. Any variation in pressure on either side of the piston/magnet will cause the magnet to move proportionally to the change in differential pressure. A rotary pointer magnet located close to the internal magnet, but outside the pressure housing, follows the movement of the piston magnet and indicates differential pressure on the dial.

Model 120 “Filter Minder”

Model 121 “Filter Minder”

Model 122 “Filter Minder”

Model 123 “Filter Minder”

Model 124 “Filter Minder”

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Diaphragm Type Differential Pressure Gauges

In Diaphragm Type DP gauges, 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.

Model 130 “Delta Gauge”

Model 140 “Delta Meter®”

Model 142 “Delta Meter®”

Model 522 Standard

Model 522 Colour

Model 700, 710, 715

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Bourdon Tube Type Differential Pressure Gauges

The Model 109 is powered by a test quality Bourdon Tube Assembly. The assembly is encapsulated in a high pressure chamber that is fitted with a pressure connection to the inside of the Bourdon Tube and a second connection to the pressure chamber. The Model 109 indicates the difference between the pressure applied inside the Bourdon Tube and the pressure inside the chamber.

Model 109

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Bellows Type Differential Pressure Gauges

The major components of the Model 105/106 are a two-piece body, bellows sensing element and over-pressure assembly, a torque tube assembly, a range spring and the gauge front assembly.

The body halves provide the pressure containment function. They also clamp the sensing element and over-pressure assembly between the halves, isolating the high side and low side pressures of the system. The high side body half also provides a mount for the torque tube assembly and the gauge front assembly.

Model 105

Model 106

Model 115 “Cryogenic”

Model 116 “Cryogenic”

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Accessories

CMC provides process instrumentation accessories from Mid-West Instrument such as Pulsation Dampeners, Pressure Limiting Valves and Manifold Valves. Mid-West Model 150 Pulsation Dampener is the most advanced pulsation dampener with fine dampening adjustments to protect both low and high displacement devices. Mid-West Model 200 Pressure Limiting Valve has a pressure limiting valve to prevent over-pressurization, automatic shutoff features, three adjustable range springs, and more. Mid-West Manifolds are rated at 6000 PSIG and 240°F, standard connections, dust cap shields, leak-free operation design, and much more.

Model 150 Pulsation Dampener

Model 200 Pressure Limiting Valve

Manifold Valves (Manifolds)

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