A height difference between the pressure measuring instrument and the diaphragm seal affects the measurement. This is due to the hydrostatic pressure of the liquid column in the capillary. The display is reduced when the pressure measuring instrument is positioned higher than the diaphragm seal. It is increased when the pressure measuring instrument is positioned lower. With the design of the entire system at the factory (diaphragm seal and measuring instrument at the same height), this height difference must be known and taken into account accordingly.