FIELD: protection or supervision of installations.
SUBSTANCE: pipeline receive pipe (2) which can be filled with fluid to be tested. Flowing through the pipe, the fluid column moves through pickup 11 which is sensitive to agents of interest. First valving device (10) is provided between pickup (11) and pipe (2). The second valving member (6) prevents the fluid column against flowing.
EFFECT: enhanced accuracy determining concentration distribution.
4 cl, 1 dwg
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