AEM Water Temperature Sensor 1/8" NPT w/Plug, Pins & Pin Lock30 2012 1 8" Water Temp Sensor Kit Accuracy: < 2 C 3. 6 Operating Temp: 40C to 200C 40F to 392F Resistive Range (?): See Table Dissipation Constant: 12 mW C. The ratio, at a specified ambient temperature, of the change in the power dissipation of the sensor to the resultant temperature change of the thermistor. Test medium: silicone oil. Thermal Time Constant: 10 sec. The time required for the sensor to achieve 63. 2% of its steady state value when