DEVICE FOR THE CAPACITIVE MEASURING OF A FILL LEVEL

System to control the charging of receptacles with a sample liquid, in e.g. a container or analysis card, in which the presence or absence of liquids is registered together with the amount of air in each receptacle to determine the topping up/removal of surplus, is new. To register the presence or absence of a liquid (4) in a container (1) e.g. an analysis card, and control the filling of the container with a given liquid volume, the channels which carry the fluid are filled wholly or partially and the available container capacity is measured by a parameter e.g. the amount of air, the oscillation frequency, the tension at the level of each receptacle after liquid has been injected. The capacity variation in each receptacle is measured at each receptacle level to register an inconsistency for corrective amounts of the liquid to be extracted from the reaction receptacles. The system is calibrated before use and, after liquid injection for topping up, the liquid supply system is closed. Each container has a capacity of