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
- 70 bar range dp transmitter with a 450 bar overpressure rating in both directions
- 1psi wet/wet differential pressure transmitter for 2000 psi line pressure
- 1 bar range pressure transmitter with 400 bar overpressure protection
- Liquid compatible transmitter with 15 psi DP range and protected on either side to 300 psi