The operators selected one AP Sensing Linear Heat Series 4 km device, with 2 channels, 44 relays and a Modbus TCP interface. Approximately 3000 meters of sensor cable was installed in a fully redundant configuration (to ensure continued monitoring in the unlikely event of a fiber break).

The passive sensor cable is immune to dirt, dust, humidity, corrosive materials and electromagnetic interference (EMI). In this case the sensor cable is contained in a stainless-steel tube with a halogen-free plastic coating.

Over 200 different zones were defined along the 3 km stretch, to account for different allowed maximum temperatures (including time differentials) and differences between a measurement location and that zone‘s average (zone differentials).

A heat gun was used to trigger alarms during the zone test. The AP Sensing DTS is installed in a 19” rack that is located in an air-conditioned remote control room. 

The system passed the Final Acceptance Test with no issues and the system has been performing problem-free since operation began. A valuable infrastructure remains protected.