Sensor fixing arrangement for measuring or counting sensor fixed in wall opening

摘要

The sensor (1) has a cylindrical body (6) protruding below a shoulder (7) into the opening (3). An O-ring (10) under a spring washer (11) seals the opening and lies in a widened section (4) of the opening. The washer is tapered in the downward direction and has a cylindrical outer rim and a screw-thread inner rim with four indentations for security. The measurements or counts are taken out through a wire (9) protruding from a screw-on cap (8) over the shoulder.