| 摘要 |
A filter device is described for obtaining a filtered sample of fluid for measuring purposes from a container or tube conduit. The device has a closed fluid circuit including a first filter element 4, a pump conduit having a pump 27 therein, and a second filter element 5 arranged so that a sample of fluid is suctioned from the container or tube conduit via the first filter element 4, through the pump conduit 26, 28 and then back to the container or tube via the second filter element 5 or vice versa. An optical probe 17 for measuring purposes can be arranged within the carrier tube 7.
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