| 摘要 |
A control unit (1) controls the function of the system through a cycle including at least one filtration stage and a pause. The filtration stage is complete when a set volume of sampled liquid has been filtered. A first means of interruption stops the cycle automatically when a volume smaller that the set volume is filtered in the filtration stage by the end of a first set time period. The system comprises a sampling module (2) to sample the liquid from a source of liquid (5) and a filtration module (3) to filter the sampled liquid and retain bacteria contained therein for analysis. The cycle has a constant duration and starts at a given moment. The system includes means for determining and indicating at least the total number of cycles completed between the given moment and the end of the cycle by the first means of interruption. The system also includes a collection module (40) to collect the filtered liquid (3), and an evacuation module (41, 42) connected to the collection module. The cycle includes, in addition to the filtration stage and the pause, a stage of emptying the collection module via the evacuation module. A first probe (400) is placed in the collection module to warn the control unit of the end of the filtration stage when the set volume of filtered liquid has been collected by the collection module. The cycle is automatically stopped by the control unit if no liquid is detected by the probe at the end of the first set time period. A second means of interruption automatically stops the cycle if the collection module is not completely empty at the end of a second set time period. This comprises a second probe, connected to the control unit inside and near the bottom of the collection module. The cycle is interrupted automatically if during the emptying stage liquid is detected by the second probe after a second set time period. The collection module is open at the top and placed beneath a liquid outlet from the filtration module. The evacuation module comprises an electrovalve (41) with an inlet connected to an orifice in the bottom of the collection module and an outlet connected to an evacuation pipe to the drain. The sampling module comprises an electrovalve controlled by the control unit with an inlet connected to the source of fluid through a pipe and an outlet connected to the filtration module. The filtration module has a filtration chamber connected to the electrovalve outlet and contains inside the chamber a filtration membrane to retain the bacteria removed from the liquid as it passes through the chamber. The system also contains means of introducing a de-oxidizing solution into the filtration unit during the emptying and filtration stages. The fluid is sampled regularly (punctually).
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