Wireless temperature sensor for mechanical face seals using permanent magnets

•Wireless temperature for mechanical face seals using permanent magnets.•Sensor based on thermal-induced magnetic field change sensed by Hall effect sensor.•Sensor operates through non-magnetic metals.•Results verified in static and dynamic tests on seal test rig.

This paper presents a unique wireless temperature sensor operating through metal enclosure for mechanical face seal applications. The sensor is based on temperature-induced magnetic field change in permanent magnets sensed remotely by a Hall effect sensor. The sensor has been tested from 5 °C to 78 °C and has shown excellent linear results with curve fit value of 98%. Furthermore, the sensor concept is verified by performing dynamic tests at 1800 rpm and 12 bar pressure using water as system fluid in a seal test rig. The proposed sensor response is compared to a thermocouple attached to the seal stator where excellent agreement is obtained.