Monitoring device for a system for generating medical compressed air

A system for generating and distributing medical compressed air, the system comprising:

• a compressed air supply line downstream of a compressed air conditioning unit;
• and
• a monitoring device, the monitoring device comprising:
• a measured air line for removing compressed air from the compressed air supply line downstream of the compressed air conditioning unit;
• a sensor for generating a measured signal as a function of a property of the compressed air fed through the measured air line;
• a humidifier for humidifying the compressed air upstream of the sensor;
• an output unit for outputting information about the property of the compressed air to a user on the basis of the measured signal;
• a tap for removing compressed air;
• and
• an actuator for changing a volume flow and/or mass flow of the compressed air, which volume flow and/or mass flow prevails in the measured air line, wherein the actuator is inserted into the tap in a measuring mode and is removed from the tap in a compressed air removal mode.