| 摘要 |
The sampling device contains a sampling bag, a pressure sensor (P), two electrically controlled changeover valves (EV1) (EV2), switches (I1,I2), a timer (T) and indicating lamps (L1,L2). The sampling bag is first evacuated and then filled from the atmosphere. Evacuation of the sampling bag is effected by closing he first switch (I1) and turning the second (I2) to the vacuum position. The pump starts and the position of the changeover valves (EV1) (EV2) causes evacuation of the sampling bag terminated by a pressure sensor (P). The sampling bag is filled by turning the second switch (I2) to the fill position such that the changeover valves (EV1) (EV2) fill the bag from the outside atmosphere.
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