Model 122

Piston Type Gauges

Model 122 – Our most affordable entry level piston gauge with a Full scale accuracy of ±5% combined with Differential pressure dial scales of 0-5 PSID to 0-110 PSID. Model 122 is available with clamp on electrical switch options. There are fewer options available compared to the Model 120, but the Model 122 has a lower price point while still delivering exceptional performance.

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Product Features/Benefits

  • Competitively Priced
  • Rugged Piston Type design Sensing Element
  • Glass Reinforced Thermoplastic Dial Case (Panel mountable)(Anodized Aluminum Dial Case Option available contact sales for more information)
  • Weather Resistant & Corrosion Resistant
  • Shatter Resistant Lens
  • Over-Range Protection, High over Low and Low over High
  • 5 Year Warranty
  • For complete model details See bulletin_122.pdf
  • Installation and Operation Manual See Bulletin: IOM_122.pdf

Specifications / Configuration

  • Dial Sizes available: 2-1/2”, 3-1/2”, 4-1/2” and 6” Diameters
  • Differential Full Scale Ascending Accuracy ±5% (ASME B40.1 Grade D)
  • Dial Scale Ranges: 0-5 PSID to 0-100 PSID (0-.35 bar to 0-7.0 bar)
  • Available in a Variety of Dial Scales: Bar, Mbar, kPa, Kg/Cm2, Dual Scale etc.
  • Working Pressures up to 3000 PSIG (300 Bar)
  • Operating Temp -40°F to +200°F (-40°C to +93°C)
  • Lens Weather Protection NEMA 4X
  • Material of Construction of Body – Aluminum (Wetted Part)
  • Internal wetted parts-316 Stainless Steel Piston & Ceramic Magnet
  • Available with End connections only
  • Elastomers (O-rings) Buna-N, Viton, Neoprene, Teflon, and Ethylene Propylene
  • For complete specifications see: Specificationsheet_122.pdf

Common Applications

  • Filter and Strainer Monitoring
  • Compressed Air
  • Hydraulic
  • Refrigerant
  • Pump Performance testing
  • Heat Exchanger Pressure Drop Monitoring

Switch Electrical Specifications:

See Bulletin ELECIOM_122

Mid-West Instrument Model 122 Clamp-On switches are adjustable allowing customer to set the switch within a defined adjustment span of range of the instrument. Mid-West can also pre-set switch set point(s) upon customer request.

  • No Power required to operate switches
  • Available Clamp On switch Output options:
    • SPDT 3W, 0.25 Amp, 125 VAC/VDC
    • SPST 60W, 3.0 Amp, 240 VAC/VDC  (Normally Open)
    • SPDT 60W, 1.0 Amp, 240 VAC/VDC
  • All Switch Options CE Marked to Low Voltage and RoHS Directives

Additional Options:

  • Pipe Mounting Kit - 2" U-Bolt
  • Wall Mounting - Rear Mount
  • Rear Mounting Holes
  • Liquid Fill
  • Oxygen Cleaning
  • Maximum Follower Pointer

The Mid-West Advantage

“Piston Type” Gauges with Electrical Optional

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 120 0-5 PSID to 0-110 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Flying Leads / DIN Connector, Class 1-Div. 1, Class 1-Div. 2
Model 122 0-5 PSID to 0-110 PSID ±5% 3,000 PSI CE / LVD, RoHS Compliant
Model 123 0-150 PSID to 0-400 PSID ±3/2/3% Up to 5,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Flying Leads / DIN Connector, Class 1-Div. 2
Model 124 0-5 PSID to 0-110 PSID
and
0-150 PSID to 0-400 PSID
±3/2/3% 10,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, 4-20mA Transmitter

Electrical “Piston Type” Gauges

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 121 0-5 PSID to 0-100 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X,Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 220 0-5 PSID to 0-100 PSID ±3/2/3% Up to 4,000 PSI CE / ATEX / RoHS Compliant, KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A