Diesel Engine, Water Temperature Sensor, 120c Alarm Generator Part. Specifications: Application:diesel Engine Temperature:MAX 120C Water Temperature Sensor (14mm /17mm /21mm Optional) 14MM=1/4NPT 17mm=3/8NPT 21MM=1/2NPT Working Principle: When the Water Temperature is Higher, the Resistance Value is Lower. The Lower the Water Temperature, the Greater the Resistance Value. Working Range: 0-120 Degrees. Alarm Temperature: 97 + -2 Degrees When the Water Temperature Reaches the Alarm Temperature and the Alarm Switch is Closed, the Alarm Light Will Turn On. When the Water Temperature Decreases and the Alarm Switch is Turned Off, the Alarm Light Will Be Turned Off. When the Alarm Temperature is Reached, the Response Time is Approximately 1 Second. The Water Temperature Sensor Has 2 Wires, One is Connected to the Water Temperature Meter, and the Water Temperature Parameter is Displayed. One Connection Alarm Switch . We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.