| 摘要 |
PURPOSE:To prevent the contamination of a filter, by arranging a pass partition with an impact surface in a gas passage between a gas introduction port and a gas detection element so as to make introduced gas hit the surface. CONSTITUTION:A gas detection element 3 is incorporated into a casing 1 to detect a gas to be detected coming from a gas introduction port 2. The element 3 is covered with a filter 4 to shut down the infiltration of impure gas. A plurality of pass partitions 6 each with an impact surface 6a adapted to make gas to be detected hit it are arranged in a gas passage 5 between the introduction port 2 and the element 3 in such a range as not to block the flow of the gas being detected and as the gas being detected is sure to hit any of the pass partitions 6, oil mist and dust flowing into the introduction part 2 together with the gas being detected will attach to the pass partitions 6 or be blocked from flowing thereinto. This can prevent the contamination of the surface of the filter 4 on the element 3 thereby eliminating the possibility that the element 3 may not operate whenever necessary with complete freedom from the clogging. |
