| 摘要 |
To permit free entry of ambient air, without clogging, dust deposits, and for easy cleaning of the sensor, the housing for the sensor is formed in at least two parts separated from each other by an essentially continuous ring-shaped slit, the parts of the housing in the vicinity of the slit being formed to provide a labyrinth path for passage of air through the slit into the chamber, in which the direction of air flow is deflected from an essentially straight path; one of the electrodes of the sensor is an air-pervious grid or mesh located to prevent mechanical access to the other electrode. |
