The level control unit comprises the supply unit to adjust the input pressure, to drain the water from the compressed air and separate the vibration isolation system from the supply pressure by a ball valve. The main air flow can be adjusted by a throttle valve. The actual input pressure and the pressure in the three sub systems is displayed by analog pressure gauges.

The vibration isolation system can be lifted and lowered by a key switch. The actual status of the vibration isolation system is indicated by LEDs (green => lifted, red => lowered). This information is also available as an output signal. In the case additional air volumes are installed the vertical natural frequency of the vibration isolation system can be switched by an additional key switch of the level control unit LC302.