| 主权项 |
1. A headspace sampler, comprising:
a) a sample gas collection channel whose one end communicates with a needle; b) a pressure gas introduction channel and an exhaust channel that communicate with another end of the sample gas collection channel in parallel via a branching pipe; c) a first on-off valve provided in the pressure gas introduction channel; d) a second on-off valve provided in the exhaust channel; e) a pressure sensor provided at one of positions comprised of a position on the sample gas collection channel, a position between the branching pipe and the first on-off valve of the pressure gas introduction channel, and a position between the branching pipe and the second on-off valve of the exhaust channel, and for measuring a pressure in the channel at the position; and f) gas leak determination means for penetrating a sample container with the needle, and subsequently introducing a pressure gas into the pressure gas introduction channel by closing the second on-off valve and opening the first on-off valve,
for first determining a leak of gas from the sample container based on a measured value of the pressure sensor,for, in case of first determination of no leak, closing the first on-off valve, creating a state where both the first on-off valve and the second on-off valve are closed for a predetermined waiting time period, andfor secondly determining a leak of gas from the sample container based on a measurement result of the pressure sensor during the waiting time period. |
