Diaphragm Type Differential Gauges

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DP Range 140:
0-25 PSID (0-1.7 bar) thru
0-100 PSID (0-7 bar)


Model 140 shown 2-1/2" dial

model 140

MODEL 140-142

model 142

DP Range 142:
0-20 In H2O (0-50mbar) thru
0-25 PSID (0-1.7 bar)


Model 142 shown 2-1/2" dial

Order your custom DP gauges here

Configuring your custom gauge is SIMPLE!

Make selections below for your unique applications.

STEP 1 - Choose your model.

STEP 2 - Choose your body material.

STEP 3 - Choose your dial size.

STEP 4 - Choose your seal material.

STEP 5 - What connections do you need?


STEP 6 - Select your range type.

STEP 7 - How many gauges do you need?

Here's your price per gauge:



Adding a switch to your gauge is optional.

STEP 8 - Switch Options

Learn more about switches

All switches come with standard electrical specification: SPDT 3Watt 0.25 Amp 125 VAC/VDC

Switch Set Point

Please specify Set point range as increasing or decreasing dp.

If not specified switch will be set mid-scale increasing dp.

All switches are field adjustable....



Product Features and Benefits

  • Total separation of high and low by a convoluted elastomer diaphragm
  • Sensor magnetically coupled to the indicating pointer and optional switches
  • Over-range protection to max pressure
  • Weatherproof rated to NEMA 4X/IP65
  • Dial: 2-1/2" & 4-1/2" Uni-Directional
  • Operating Temp. -40º F to +200º F (-40ºC to +93ºC)
  • Working Pressure: 3,000 PSI (Proof Pressure: 6,000 PSI) (Aluminum & Stainless Steel Bodies)
  • Working Pressure: 1,500 PSI (Proof Pressure: 3,000 PSI) (Brass Body)

The Model 140/142 provides outstanding capabilities not previously available. It is ideally suited for use on dissimilar fluids, wet gas or fluids with high concentration of solids, etc. Use in, Filter/Strainer Monitoring, Compressed Air, Hydraulic, Refrigerant, Pump Performance Testing, Heat Exchanger Pressure Drop Monitoring, Water Treatment Applications, Tank Level Monitoring Horizontal or Vertical and Flow Monitoring & Balancing.

Choose Aluminum, 316L Stainless Steel or Brass Body based on the
process media your gauge comes into contact with.

About This Product

DP Range 140: 0-25 PSID (0-1.7 bar) thru 0-100 PSID (0-7 bar)
DP Range 142: 0-20 In H2O (0-50mbar) thru 0-25 PSID (0-1.7 bar)

Mid-West Diaphragm Type: Models 140 & 142 ± 2% Full Scale Accuracy. The high and low-pressure ports are completely isolated from each other. There is no bypass and therefore they are best suited for air or gas along with liquids. They also come in a variety of sizes allowing for very sensitive measurements. The Differential Pressure is sensed by the movement of an elastomer diaphragm against a precision calibrated range spring. The change in position of the diaphragm in response to the change in Differential Pressure moves an internal magnet. This magnet, in turn, causes a rotary magnet external to the gauge body to rotate. This rotary magnet has a pointer attached which indicates the differential pressure on the dial. The diaphragm provides total separation.


DP Ranges: Inches H2O, PSID, Bar, and Kpa
Body Materials: Aluminum, Brass and 316L Stainless Steel
Dial Types: 2-1/2" or 4-1/2" round Uni-Directional
Seals & Diaphragm Materials: Buna-N, Viton
Carbon or Stainless Steel Pipe Mount Kits
Liquid Fill or Maximum Follower Pointer (Can not combine Liquid Fill with Maximum Follower Pointer options)
Wall Mount Kit (Wall Mount option not available for Model 142 with back connections)
Connections: 1/4" or 1/2" FNPT



Dial Types: 4-1/2" Round Uni-directional anodized aluminum housing assembly.
Non-Indication with select switch options.
Seals & Diaphragm Materials: Silicone, Neoprene(25 PSID & Up.) and Ethylene Propylene
Connections: 7/16"-20 Straight thread "O" ring port
Other Options: Reversed high/low process connections, Oxygen Cleaning, Stainless Steel Tags and more...


All Model 140/142 differential pressure gauges either conform to and/or are designed to the requirements of the following standards:

ASME B1.20.1

ASME B40.100

CSA-C22.2 No. 14.25 and 30


NEMA Std. No. 250

SAE J514