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1120 Series Differential Pressure Units


For more information on purchasing this product please contact Meriam at 216.281.1100

The Meriam Model 1120 Differential Pressure Unit is a proven and reliable sensing element used in all Meriam Bellows Gauges. It is available in ranges as low as 0-30″ w.c. or as high as 0-500 PSI. The light weight and compact differential pressure unit incorporates a rupture-proof and leak-proof bellows plus other features that ensure ruggedness and reliability. This basic unit is suitable for activating indicators, recorders, transmitters, switches and controllers. It is also available as a separate assembly for that purpose.

The 1120 consists of a high and a low pressure bellows connected to each side of a center plate. The bellows are enclosed in end housings which in turn are bolted to the center plate. The interior of the bellows and center plate is completely filled with a clean, low freezing point, non-corrosive fill fluid. As differential pressure is applied, this fill fluid moves between the bellows through a field adjustable dampening valve in the center plate. Other external dampening devices are not required for measurements of pulsating differential pressure. Also, the Meriam 1120 incorporates a special design which completely isolates the process fluid from the center plate.

For More Information on How to Purchase this Product Contact or Call 216.281.1100

Provides Standard System Accuracy

  • 30" w.c. range 1.50% FS
  • 50" w.c. thru 500 PSID range 0.75% FS
  • Operating Temperature: -60°F to +200°F

Ease of Use

  • Rupture-proof and leak-proof bellows
  • Additional external dampening devices are not required to measure pulsating differential pressure
  • Special design isolates the process fluid from the center plate

Typical Applications

  • Industrial Process Plants
  • Power Plants
  • Pollution Control Facilities
  • Cryogenic Gas Industry


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