Model 122 - Differential Pressure Piston Type


The Mid-West Model 122 piston type gauges are primarily designed for liquid applications. 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. Piston type DP gauges exhibit a slight amount of bypass as the fluid crosses from the high to the low pressure port.


  • Differential Pressure Range 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar)
  • Accuracy ±5% Full Scale
  • Working Pressure 3,000 PSIG (200 bar)
  • Operating Temp. -40º F to +200º F (-40ºC to +93ºC)
  • Body Material: Aluminum
  • Internal Materials: 316 Stainless Steel
  • Switch Options:
    • SPDT 3W, 125 VAC/VDC, 0.25 amps
    • SPDT 60W, 240 VAC/VDC, 1.0 amps
    • SPST 60W, 240 VAC/VDC, 3.0 amps
  • CE Marked in accordance with low voltage directive
  • Switch Mounting: Clamp On, Stick On Flat Pack
  • Process Connections: 1/4″ FNPT End Conn.
  • Gauge Design: Magnetically Coupled Piston
  • Base Dimensions 3.3H” x 1.97W” x 4.93L”
Model 122
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