Mid-West Instrument Model 121 Differential Pressure Gauge

Mid-West Instrument Model 121 ''Filter Minder''

Differential Pressure Gauge - Piston Type

Common Applications:

  • Filter/Strainer Monitoring
  • Compressed Air
  • Hydraulic
  • Refrigerant
  • Pump Performance Testing
  • Heat Exchanger Pressure Drop Monitoring

Product Features:

  • DP Ranges from 0-5 PSID to 0-110 PSID (0.35 to 7.0 bar)
  • Piston Sensing Element
  • Working Pressure up to 6000 PSIG (400 bar)
  • Over-Range Protection, High over Low and Low over High
  • Gauge Housings available in Aluminum, 316/316L Stainless Steel.
  • Wide Range of Elastomers

Product Features/Benefits:

  • Simple Rugged Designs
  • Glass Reinforced Thermoplastic Gauge Front Is Standard
  • Weather Resistant & Corrosion Resistant Gauge Front
  • Shatter Resistant Lens
  • 5 Year Warranty

Special Features:

  • Over-range Protection Full to Maximum Working Pressure
  • Panel Mounting Standard
  • Pipe Mounting Kit Optional – 2″ U-Bolt
  • Wall Mounting Optional – Rear Mount
  • NACE Compliance Optional
  • Seismic Compliance Contact Factory
  • Typical Manifold Installation

Specifications:

  • Differential Pressure Range 0-5 PSID to 0-110 PSID (0-0.35 bar to 0-7.0 bar)
  • Available in a Variety of Equivalent Ranges & Scales
  • Accuracy ±2%*
  • Operating Temp -40ºF to +200ºF (-40ºC to +93ºC)
  • Dial Size 2-1/2″ Round (Standard), 3-1/2″ Round (Optional), 4-1/2″ Round (Optional)
  • Working Pressure 6000 PSIG (400 bar)
  • Material of Construction of Body – Aluminum, 316/316L Stainless Steel.
  • Materials of Construction of Internals – 316 Stainless Steel (Standard)
  • Switch Options:
    • SPDT 3W, 0.25 Amp, 125 VAC ( 15-95% F.S.) adjustability
    • SPST 60W, 3.0 Amp, 240 VAC ( 20-95% F.S.) adjustability
  • Electrical Enclosures Weather-Resistant, NEMA 4X, IP65
  • Transmitter Options:
    • 4-20mA Loop Powered Micro Processor based Transmitter
    • Internal Push Button Zero (available for non-hazardous locations only)
    • 4 Position Terminal Strip
    • 8-28 VDC Loop Powered 2-wire interface
    • 1000 Ohm max loop resistance at 28 Vdc.
    • ±2% Accuracy from 20% to 100% of scale, ascending
    • Operating Range -20ºF to 150ºF (-20ºC to 65ºC)
    • Indicator operation is isolated from Loop Power
    • Weather Resistant
    • Assembly is housed in a NEMA 4X (IP65) Enclosure
    • Engineered plastic enclosure with 1/2″ NPT access