They usually have some base resistance and that either increases or decreases as the temperature goes up or down. A NO temperature switch at a temperature below it’s trigger temp will show no connection to earth (or open circuit if it has two connections), a NC temperature switch at a temperature below it’s trigger temp will show a connection to earth (or zero ohms if it has two connections).Ī temperature sensor, on the other hand, reacts to the temperature. Temperature switches are binary, they are either on, or off: their state is determined by the temperature. On the E-type the fan is driven by a switch which is normally Open, when the coolant reaches the trigger temperature the contacts close and stay closed until the temperature drops (which is what the fan which that switch drives will achieve, hopefully). Once the engine warms up, the switch opens and the starting carb turns off. When the engine is cold the switch is closed and the starting carb is “on”. The circuit in this case is Batt+>Starting carb solenoid>Otter switch>earth. it shorts to earth) below the rated temper, and they open once the rated temperature is reached. In the case of the “hisser” switch on the saloons the contacts are closed (i.e.
On the saloons the starting carb is driven by a temperature switch visually indistinguishable from the otter switch controlling the cooling fan on the e-type. They come in either normally closed (NC), or normally open (NO), and act at a given temperature.
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