A standard stainless steel flange for 1/2" NPT thread, suitable for mounting various sensor probes. This is screwed onto the duct wall, and a transmitter probe is then inserted into the central hole and locked using a lock key.

The central thread is 1/2 inch NPT, and is supported by thread ring extruding 10mm. The flange is held in position by 4 screws for 6mm diameter screwholes, at 50mm diameter of the flange. The flange is 75mm diameter overall, and only 5mm at the thinnest point. This model comes with the RHT-P10, but also works for other suitable sensors with 1/2 inch NPT size.