Model 120 Piston Type Differential Pressure Gauge & Switch

Brand: Mid-West Instrument

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. 

Due to precision sizing of piston and body bore, leakage across the piston will not exceed 15 SCFH air at 100 psiD at ambient conditions.
Features
  • Simple, rugged, compact design
  • Working pressures up to 6,000 psiG (400 bar)
  • Over-range protection to maximum pressure
  • Body Materials: Aluminum or 316L Stainless Steel with 316 stainless steel internals. Aluminum Bronze & Monel available 
  • Weather-resistant construction standard
  • Shatter resistant acrylic lens
  • Variety of Dial type and Sizes: 2-1/2", 3-1/2", 4-1/2" & 6" 
  • Available DP Ranges: Inches H2O, psiD, bar, and kPa
  • ¼" Female NPT & ½" Female NPT process connections
  • Multiple mounting options available
  • Temperature limits: -40° to +200° F (-40° to 93° C)

Specifications

Accuracy

  • ± 2 %

Approvals & Certifications

  • CE
  • CRN
  • CSA (C,US)
  • RoHS
  • UL (C,US)

Diaphragm Material

  • Ethylene Propylene (EPR)
  • Neoprene
  • Perfluoroelastomer
  • Teflon
  • Viton

Enclosure, Body Material

  • 316 Stainless Steel
  • 316L Stainless Steel
  • Aluminum
  • Aluminum Bronze
  • Monel

Environmental Protection

  • IP65
  • IP66
  • NEMA 4X
  • NEMA 7

NACE & NIST

  • NACE

NPT Connection

  • 1/4” NPT Female

Output

  • 4-20 mA

Pressure Type

  • Differential

Set Point - Decreasing

  • bar: 0 to 7
  • kPa: 0 to 700
  • psi: 0 to 110

Set Point - Increasing

  • bar: 0 to 7
  • kPa: 0 to 700
  • psi: 0 to 110

Switch Type

  • SPDT 3 W, 125 Vac/dc, 0.25 A, 60 W, 240 Vac/dc, 1 A
  • SPST 60 W, 240 Vac/dc, 3 A

System Pressure

  • bar: 0 to 400
  • kPa: 0 to 40,000
  • psig: 0 to 6,000

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