| 摘要 |
PURPOSE:To connect a portable type measuring device to sampling point by providing a line which can bypass the measuring device in a rack having the measuring device and a sample pump. CONSTITUTION:All selecting solenoid valve 3 except a sampling point s1 are closed, and an atmospheric air of s1 is led into a dust sampler 20. In the dust sampler 20, a measuring line cut-off valve 21 is opened, a bypass valve 22 is closed, and from an absorbed sample air, dust is adsorbed to a catching filter paper 5, measured by a radiation detector 10, and a signal is sent to a counting rate meter 13 through a pre-amplifier 12. In this way, a measurement is executed by switching successively a sampling point. When the measurement is shifted to a point to which a portable type measuring device 19 is connected, as shown by s2, the measuring operation is executed by closing a measuring line cutting- off solenoid valve 21 in the dust sampler, and opening the bypass valve 22. |
