METHOD OF ZERO-POINT RETURN OF SMELL SENSOR FOR DETECTING VOLATILE COMPONENT

PURPOSE:To achieve a significant increase in measuring efficiency by inserting a hydrogen peroxide solution into a detection chamber to bring hydrogen peroxide evaporated from the hydrogen peroxided solution into contact with a small sensor. CONSTITUTION:When a sample container 11 holding a sample 10 of an object to be detected is mounted on an opening part 14, the container 11 communicates with the inside of the a detection chamber 1 through an opening 14 and a volatile component rising from the sample 10 flows to reach a smell sensor S passing through an opening part 29 of a buffer equalization plate 25 according to the opening thereof 29. The component is outputted according to an adhering amount thereof to perform a measurement of a smell density or the like. After the end of one measurement, the container 11 is removed before a shift to the subsequent measurement and a ventilator 6 is driven to discharge the volatile component within the detection chamber 1 outside at the opening 14. Then, an H2O2 container 13 is mounted right facing the opening 14. H2O2 evaporating from the container 13 rises to reach the sensor S and the indication of the container 13 returns to the zero point in a short time with the supply of oxygen to the sensor S. Thus, by putting a lid on the container 13 when the indication returns to the zero point or the like, the evaporation of hydrogen peroxide is stopped.