The functionality of the main components of a pressure regulating station is carefully tested by means of the portable, easy-to-operate PLEXOR® device. Reliable quantitative test results are obtained. The connection of the PLEXOR® device to the pressure regulating station is achieved by means of specially designed, system couplings which are permanently installed in the pressure regulating stations (BMA05, BMA06 and BDA06 for PN100. BMA04, BMA10 and BDA10 for PN16). The test results are stored automatically in a hand-held computer or laptop, without the inspector’s intervention.