摘要 |
For the automatic introduction of additional liquid (4) into a container (1) until a predetermined level is reached, a gauge tube (3) with an opening positioned at the predetermined level is inserted into the container, the gauge tube being connected to a compressed air source (5) for the build-up of a back pressure when the opening is closed by the liquid (4); valves (8, 9, 10, 11, 12, 23) are used to obtain from the back pressure actuating signals for a liquid pump (13) which is connected via non-return valves (18, 19, 21) both to a liquid reservoir (20) and to the container (1). <IMAGE>
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