OEM

Differential Pressure Indicators

0-3.5 PSID to 0-100 PSID

  • Safe working Pressures up to 3,000 PSI
  • Rugged Construction / Some Units  Weather Proof designs
  • 5% Accuracy
  • Calibrated to Color Breaks Only
  • Designs configured to customer needs
  • Indicator only or with Switch options
  • Common Applications:
    • Filter Monitoring
    • Strainer Monitoring
    • Water System Applications
    • Compressed Air
    • Hydraulic
    • Refrigerant
    • Heat Exchanger Pressure Drop Monitoring
  • 25 Piece Minimum Order 

Piston Type

Model 126/127

The Model 126/127 Series differential pressure indicator with optional switch is a piston-type gauge. It is low cost and reliable for measuring pressure drop across filters, strainers and separators.

  • 126 Range: 0-5 PSID thru 0-20 PSID (0.35 bar thru 1.4 bar)
  • 127 Range: 0-25 PSID thru 0-100 PSID (1.75 bar thru 7.0 bar)
  • Max. Static Pressure 3000 PSIG (69 bar)
  • Switch Configurations:
    • Clamp On
    • Stick on or Screw On Flat Pack
  • Switch Rating Options:
    • SPDT  3 W, 0.25 Amp,  125 VAC/VDC
    • SPST 60W, 3 Amp, 240 VAC/VDC

Model 126Model 127

Diaphragm Type

Model 146

The Model 146 Series differential pressure indicator is a diaphragm-type ∆P gauge that has total separation between the high and low sides. Additionally,  switch options are available.

  • Range: 0-50” H2O thru 0-30 PSID (0.125 mbar thru 2.0 bar)
  • Max. Static Pressure 1000 PSIG (69 bar)
  • Switch Configurations:
    • Clamp On
    • Stick on or Screw On Flat Pack
    • DIN IP65 Connector (Preset Switch Only)
  • Switch Rating Options:
    • SPDT  3 W, 0.25 Amp,  125 VAC/VDC
    • SPST 60W, 3 Amp, 240 VAC/VDC

Model 146

Model 146, Switch, DIN Connector

Model 444

The Model 444 Series Differential Pressure Indicator offers a simple, yet functional design for use with filters, strainers, etc. Indication –Green / Red Sliding Indication with Nylon Lens. This low cost indicator makes the perfect alternative to more costly differential pressure gauges where readability, small size and price are important considerations.

  • Range: 0-5 PSID thru 0-25 PSID (0.35 bar thru 1.7 bar)
  • Max. Static Pressure 300 PSIG (20 bar)

Model 444

Model 522  OEM

Model 522 OEM – Mid-West Instrument rolling diaphragm type gauge is a very competitively price gauge/switch. The Model 522 Differential Pressure Gauge & Switch is compact and weather resistant  for challenging DP Applications and installations. It is suitable for use in outdoor and “Hose Down” applications. Available with our popular DIN Plug  connector  or Flat Pack Switch.  Both are available in  a SPDT or  SPST configurations . Model 522 is available with a Full scale accuracy of ±5% (0-5 PSID to 0-50 PSID)

  • Range: 0-5 PSID thru 0-50 PSID (0.35 bar thru 3.4 bar)
  • Max. Static Pressure 1000 PSIG (69 bar)
  • Weather- proof lens design
  • Over-Range protection Hi – Lo (200 PSID)

Model 522

Model 555

The Model 555 Series Differential Pressure Gauge offers a two-sided dial, for use with filters, strainers, etc. 555 Provides easier installation regardless of flow direction. The rolling diaphragm sensing element isolates the high and low side of the indicator assuring filter efficiency (Reverse pressure must be avoided) While this low cost gauge is a “step up” from the Model 444, it still provides another alternative to the more costly differential pressure gauges with equivalent functionality. No switch options available.

  • Range: 0-5 PSID thru 0-50 PSID (0.35 bar thru 3.4 bar)
  • Max. Static Pressure 300 PSIG (20 bar)
  • Simple Molded Design
  • Color Dials
  • Dual Display
  • Buna or FKM Elastomer Seals

Model 555

OEM Indicators “Piston Type”

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 126 0-5 PSID to 0-20 PSID ±5% 3,000 PSI Available CE Marked to LVD & RoHS N/AN/A
Model 127 0-25 PSID to 0-100 PSID ±5% 3,000 PSI Available CE Marked to LVD & RoHS Directives N/AN/A

OEM Indicators “Diaphragm Type”

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 146 0-3 PSID (0-50" H2O) to 0-30 PSID ±5% 1,000 PSI Electrical Enclosures Weather-Resistant, NEMA 4X N/AN/A
Model 444 0-5 PSID to 0-30 PSID ±5% 300 PSI None available N/AN/AN/A
Model 522OEM 0-5 PSID to 0-50 PSID ±5% 1,000 PSI Available CE Marked to LVD & RoHS Directives, SPST & SPDT Switches N/AN/AN/AN/A
Model 555Tri-Color 0-3.5 PSID to 0-43 PSID ±5% 300 PSI Not Available N/AN/A
Download Your
Mid-West Instrument Catalog