Patent ID: 6926814

Claim:
An automatable measuring, cleaning and calibrating device for pH-electrodes or electrodes for measuring redox potentials, having an electrode armature which keeps the measuring electrode in one of an operating position and in a maintenance position, where the electrode is retained in the maintenance position in a rinsing chamber in which a cleaning and calibration process can be carried out, and having a pump device for supplying cleaning fluid and calibration solution to the rinsing chamber over a delivery line connecting the pump device and the rinsing chamber, characterized in that the pump device comprises several feeds on its intake side, an another device is provided for selectively activating a specific feed and a media selectively brought over the several feeds to the pump device reaches said rinsing chamber over a common delivery line, the pump device including a first component connectable with the several feeds which has one opening per feed, the openings being selectively connectable to an intake duct on the pump device, the another device for selectively activating one feed having a second component adjustable with respect to the first component, the second component including the intake duct, and the first and second components being adjustable with respect to each other such that an intake port in the intake duct is selectively connectable to a specific feed.