Test apparatus for testing the microbial activity on surfaces

A device for reproducible testing of properties of material surfaces with regards to test organisms comprising:

• a sample receiving appliance comprising a substrate holder,
• a receiving device for test organisms comprising a flask, and
• a jet pump appliance,
• wherein the jet pump appliance is, or can be brought into, active connection with the receiving device for test organisms comprising a flask, and
• wherein the jet pump appliance is configured and adapted in order, by means of a propellant medium having a higher pressure than atmospheric pressure at the location of installation of the device, to spray test organisms in the form of an aerosol in the direction of the sample receiving appliance comprising a substrate holder, characterized in that
• the device for the reproducible testing of properties of material surfaces with regards to test organisms has an installation for controlling a reproducible pressure of the propellant medium comprising a valve during the spraying of the test organisms, and wherein the device further comprises:
• a distance control means for controlling a reproducible distance of the sample receiving appliance comprising a substrate holder from the jet pump appliance, and optionally comprising a distance measurer for measuring the distance of the sample receiving appliance comprising a substrate holder from the jet pump appliance, and
• wherein the receiving device for test organisms comprising a flask is in active connection with a stirrer.