WiSenMeshNET Dynamic Displacement & Temperature Sensor Node

This internally powered dual sensor node allows remote measurement of dynamic distance displacement associated to track voiding and critical rail temperature (CRT) monitoring utilising a magnetic probe which measures the rail skin temperature.  The spring-loaded displacement sensor has a measurement range of 50mm with range models of 100/150 & 200mm also attainable. The working principle is that the sensor becomes active through the breaching of a user defined vibration threshold trigger from an approaching train. The sensor then measures the track under load during the train passage at a sample rate of 33Hz and remotely reports the maximum, minimum and average deflection (Rail Swing) over this time period. The sensor can also be set to measure is static mode with readings attained at defined time intervals. The magnetic NTC thermistor temperature sensor is typically magnetically attached to the rail skin web using the 3kohm sensor model able to record track temperatures from -40°C to +85°C. The sensor node is installed and clamped to the underside of the rail web between the track and the ballast, with the reference plate for the displacement sensor leaned to the ballast and set to the desired initial starting range value such that track voiding deflection is measured for compression and/or expansion. The node includes an integrated internal radio antenna which then transmits data wirelessly to a site based SmartGateway before data is pushed to the internet for visualisation display and alerting. The battery lifespan is up to 9.5 years at hourly readings.