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What is difference between working, burst and over pressure

I have a confusion regarding the difference between the maximum working pressure, overpressure and burst pressure for pressure transmitters.

Max working pressure is the operating range of the pressure sensor, normally described as the “full scale” or “pressure range”.

Overpressure is the maximum amount of pressure or multiples of the measurement range that can be applied to a sensing device without causing damage.  In some cases an allowance for performance degradation will be included in the overpressure rating, but since this is a typically a zero offset, it can be easily removed by adjustment to the electronics.

Overpressure is sometimes mistaken for burst pressure which is the maximum safe pressure or multiple of the measurement range that can be applied without causing a breach of pressure containment.

e.g. A pressure transmitter with a 7 bar g pressure range described as having a 4x overpressure and a 10x burst pressure would have the following pressure limits:

  • Full Scale = 7 barg
  • Overpressure Rating = 28 barg
  • Burst Pressure = 70 barg
Overpressure protected products
  • DPT200 High One Side Overload Differential Pressure Sensor
  • DP sensor for -1 to 3 bar differential water pressure and 16 bar overpressure
  • 100 mbar abs vacuum transmitter with a 5 bar overpressure
  • Single differential versus twin absolute pressure sensor for measuring dp

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