恒温器包括继电器、阀门、电门等，当恒温器高于或低于所需的数值时，恒温器就发出信号，通常为电信号。
The thermostat generates signals, usually electrical, to activate relays, valves, switches, and so on when the temperature rises above or falls Below the desired value.
烟感探头控制装在驾驶室处的继电器，继电器控制汽车的各支路电源和电磁自动阀门。
The smoke detection probe controls a relay provided at the driving cap position; the relay controls the power supply of each branch circuit and an electromagnetism automatic valve of the automobile.
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