The working process of thermostat is as follows:

1. Temperature sensing: A temperature sensor senses the temperature change of a system or equipment and converts it into an electrical signal.

2. Signal processing: The controller receives the electrical signal from the temperature sensor and performs signal processing, such as amplification, filtering and linearization, to ensure accurate temperature measurement.

3. Temperature comparison: The controller compares the measured temperature with the preset temperature range. If the temperature exceeds or falls below the set threshold, the controller will trigger the corresponding control strategy.

4. Control strategy: According to the results of temperature comparison, the controller decides which control strategy to adopt. For example, if the temperature is too high, the controller can trigger the actuator to start the cooling equipment; If the temperature is too low, the controller can trigger the actuator to start the heating equipment.

5. Adjustment: The actuator adjusts the working state of the system or equipment according to the instruction of the controller to keep the temperature within the set range. The actions of the actuator can be switching, adjusting valves, adjusting current or power, etc.

Through the above working principle, the thermostat can monitor and control the temperature of the system or equipment to ensure its stable operation within a safe range. This automatic temperature control system can be used in various fields, such as industrial production, energy management, environmental control and so on.