ALDEHYDE MEASUREMENT DEVICE AND ACETALDEHYDE MEASUREMENT PIPE

To provide a measurement pipe capable of measuring the concentration of acetaldehyde and the concentration of formaldehyde.SOLUTION: A pretreatment pipe 7 in which a formaldehyde removal unit 35 is arranged and an acetaldehyde detection pipe 9 in which a main detection unit 46 is arranged are connected by a main connection pipe 11 to form an acetaldehyde measurement pipe 5; one end of the acetaldehyde measurement pipe 5 and one end of a formaldehyde detection pipe 10 in which a sub-detection unit 56 is arranged are attached to a suction device; and gas to be measured is suctioned from the other ends. A formaldehyde concentration can be obtained by subtracting a value obtained by multiplying an acetaldehyde concentration measured by the acetaldehyde measurement pipe 5 by a scale coefficient on the basis of the measurement result of the formaldehyde detector pipe 10.SELECTED DRAWING: Figure 4 【課題】アセトアルデヒドの濃度とホルムアルデヒドの濃度とを測定できる測定管を提供する。【解決手段】ホルムアルデヒド除去部３５が配置された前処理管７と、主検知部４６が配置されたアセトアルデヒド検知管９とを主接続管１１で接続してアセトアルデヒド測定管５を構成させ、アセトアルデヒド測定管５の一端と、副検知部５６が配置されたホルムアルデヒド検知管１０の一端とをそれぞれ吸引装置に取り付け、他端から測定対象ガスを吸引する。ホルムアルデヒド検知管１０の測定結果からアセトアルデヒド測定管５が測定したアセトアルデヒドの濃度に目盛係数を乗じた値を差し引くとホルムアルデヒドの濃度が分かる。【選択図】 図４