Model 120 "PISTON TYPE"

Differential Pressure Gauge & Switch

Model 120 – The Mid-West Instrument piston type gauge is our most versatile and customizable differential pressure gauge to fit your most demanding requirements. Available with multiple switch options including Hazardous location options. With a Full scale accuracy of ±3/2/3% combined with Differential pressure dial scales of 0-5 PSID to 0-110 PSID this rugged design is ready to do the job.

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Product Features/Benefits

  • Simple 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_120
  • Installation and Operation Manual see IOM_120

Specifications

  • Dial Sizes available: 2-1/2", 3-1/2", 4-1/2", and 6" Diameters (Uni-Directional & Bi-Directional)
  • Differential Full Scale Ascending Accuracy ±3/2/3% (ASME B40.1 Grade B)
  • Dial Scale Ranges: 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar)
  • Available in a Variety of Dial Scales: PSID, Bar, Mbar, kPa, Kg/Cm2, Dual Scale etc.
  • Working Pressures up to 6000 PSIG (400 Bar)
  • Operating Temp -40ºF to +200ºF (-40ºC to +93ºC)
  • Weather Protection NEMA 4X
  • Material of Construction of Body - Aluminum, 316/316L Stainless Steel, Alum/Bronze and Monel (Wetted Part)
  • Internal wetted parts-316 Stainless Steel, Ceramic Magnet, Alum/Bronze, Monel (Dependent on model chosen)
  • Elastomers (O-rings) Buna-N, Viton, Neoprene, Teflon, Ethylene Propylene (Perfluoroelastomer optional)

Common Applications

  • Filters and Strainer Monitoring
  • Compressed Air
  • Hydraulic
  • Refrigerant
  • Pump Performance Testing
  • Heat Exchanger Pressure Drop Monitoring
  • Valves, Chillers etc.. and for local flow indication and control.

Mid-West Instrument switches are mechanically 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.

  • SPDT 3W, 0.25 Amp, 125 VAC/VDC, ROHS Compliant
  • SPST 60W, 3.0 Amp, 240 VAC/VDC (Normally Open), ROHS Compliant
  • SPDT 60W, 3.0 Amp, 240 VAC/VDC (Normally Closed), ROHS Compliant
  • SPST 60W, 3.0 Amp, 240 VAC/VDC (1) Normally Open,(1) Normally Closed, ROHS Compliant
  • Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7
  • CE Marked in Accordance With Low Voltage Directive
  • Hazardous Locations
    • Class I Division I, Class II, Division I
    • Class I Division II, Class II, Division II

Additional Options:

  • Pipe Mounting Kit - 2" U-Bolt
  • Wall Mounting Optional - Rear Mount
  • Rear Mounting Holes
  • Liquid Fill
  • Oxygen Cleaning
  • Maximum Follower Pointer
  • NACE Compliance
  • CRN - Canadian Registration Number Optional
21/2”
31/2”
41/2”
6
Illustrations do not represent actual sizes

The Mid-West Advantage

  • 5 year warranty
  • 30 + Years Hazardous Location product manufacturer.
  • OEM and Private Label Capabilities
  • Fast on-time Deliveries
  • Friendly Customer Support
  • Certified Quality System CSA B51-09 SAI GLOBAL
  • UL Listing
  • CSA Listing
Contact Us Today For Availability
Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operator Manual Drawing
121 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar) ±2%* -40ºF to +200ºF (-40ºC to +93ºC) Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7
122 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar) ±2%* -40ºF to +200ºF (-40ºC to +93ºC) Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7
123 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar) ±2%* -40ºF to +200ºF (-40ºC to +93ºC) Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7
124 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar) ±2%* -40ºF to +200ºF (-40ºC to +93ºC) Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7
220 0-5 PSID to 0-110 PSID (0-0.35 to 0-7.0 bar) ±2%* -40ºF to +200ºF (-40ºC to +93ºC) Electrical Enclosures Weather-Resistant, NEMA 4X or NEMA 7