Importance

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Abstract

A device for drawing a liquid from a process tank, in particular, a process tank to be protected from contamination, comprising: a first receptacle for receiving the liquid withdrawn from the process tank. A first liquid line, connecting the process tank with the first receptacle and having a first end that can be connected with the process tank and a second end opening into the first receptacle; and at least one first valve assembly, which is arranged between the first and second ends of the first liquid line and is designed to block or release liquid transport through the first liquid line. The device has at least one pressure sensor, which is connected with the first receptacle, in particular, for detecting a pressure prevailing within the first receptacle and/or is arranged at the second end of the first liquid line. The device is designed to transport liquid from the process tank to the first receptacle in a first operating mode, characterized in that the device is designed to block liquid transport from the process tank to the first receptacle in a second operating mode, wherein said device is designed such that a pressure difference (p₁−p₂) between the first and the second ends of the first liquid line is greater than or equal to zero, in particular, greater than a predetermined permissible minimum value greater than or equal to zero, in particular, greater than a predetermined minimum value, both in the first operating mode and the second operating mode and as long as the first end of the first liquid line is connected with the process tank and the process tank is to be protected from contamination.

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First Claim