Based on a level measurement example in a pressurised vessel, the differences between the mechanical and the electronic differential pressure measurement are shown in simplified terms. The calculation is based upon the previously mentioned German Pressure Standard DIN 16086.
The table shows that the electronic differential pressure measurement delivers a higher measuring accuracy especially at great temperature differences. This applies even with a high turn down. But it also shows that turn down and measuring accuracy in the mechanical differential pressure measurement are independent of the pressure constellation – at least at low temperature differences.