Description: Any horizontal plane for use as the datum for height measurement; Name: ref lvl
Description: horizontal plane for use as the datum for height measurement; Name: Reference plane
Description: the pressure whose value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure. To this end, the overpressure for a pressure room can, for example, be negative with underpressure or under vacuum; Name: Max. overpressure of the shaft seal