The quartz window sensor (16) we have possessed the sunitsuhua leak detector, said quartz window sensor has the quartz window which transmits the test gas selectively (17). The quartz window (17), the vacuum blower (13) the sucking space which is connected (15) it exists. It sucks in order to shorten response duration, the space (15), the quartz window (17) and also the narrow gas guide space (19) the gas guide plate which is formed (18) is arranged.
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