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.
电路中设置的温控继电器开关装置，使取暖床垫达到了自动恒温控制目的。
The temperature control relay switch device arranged in a circuit ensures that the warming mattress realizes the aim of automatic constant temperature control.
电子恒温仪及固态继电器控制温差至最小；
Electronic thermostat and SSR control the temperature difference to minimum;
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