Measurement errors in pressure measurement
The temperature has a strong influence on pressure as a measurement parameter:
- Molecules in gases move, and their speed increases as they are heated.
- As a result, they impact walls at high speed – the pressure in the system increases.
- The signals of electronic components too, behave differently at varying temperatures. For this reason, most pressure measuring instruments are temperature-compensated.
Tips for correct pressure measurement
Tip 1: Temperature compensation
In order to obtain precise measurement results in long-term measurements, choose a pressure measuring instrument with temperature compensation.
Tip 2: Temperature acclimatization
In cases of extreme temperature differences, carry out a temperature compensation and a temperature acclimatization (approx. 30 min).
Tip 3: Correct connection
Always allocate positive and negative pressures to the right connections. Otherwise false measurements or none at all can be the result.
Ensure that the maximum pressure of the sensor is not exceeded, as it can otherwise be damaged.
Procedure for a correct pressure measurement
- Carry out temperature acclimatization (ideally with the instrument running).
- Zero the (depressurized) measuring instrument.
- Connect the measuring instrument to the pressure system.
- Observer correct connection: Higher pressure (positive pressure) to "+" Lower pressure (negative pressure) to "-"
Peculiarities of Pitot tube measurement
Pitot tube measurement is in principle a differential pressure measurement. We have summarized in a compact form what needs to be taken into account with this special measurement method.