| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a suspended particulate matter sensor unit capable of maintaining excellent detection accuracy for a long period of time.SOLUTION: A suspended particulate matter sensor unit includes: an air flow channel 11; filters 15, 16 provided in the flow channel 11; detection means 14 for detecting suspended particulate matter in a space between the filters 15, 16; and air supply means 17, 18, 19 for supplying air from the outside of the flow channel 11 to the space between the filters 15, 16. A direction of the air flowing in the flow channel 11 can be changed by the air supply means 17, 18, 19.</p> |
