A constant temperature controller refers to a control device used to maintain the temperature of the main body at a certain point or a certain temperature range. It mainly senses and regulates the temperature of the main body through circuits and sensing elements. Widely used in chemistry, physics, biology and other fields, and also widely used in daily life, such as incubators, refrigerators and so on.
How a thermostat works
RT has a large resistance at low temperature and a small resistance at high temperature. When the ambient temperature is lower than the set temperature, the voltage of pin 2 of the μA741 universal operational amplifier is higher than that of pin 3, and pin 6 outputs a low level (required to be lower than 3V), so pin 2 of the trigger terminal of the 555 time base circuit is low voltage. Ping, its output terminal 3 outputs a high level, so that VL2 lights up and indicates, and at the same time triggers the bidirectional thyristor VTH to conduct, so that the heater is energized and heated up. When the ambient temperature is higher than the set temperature value, the voltage of pin 2 of μA741 universal operational amplifier is lower than that of pin 3, and pin 6 outputs a high level (required to be higher than 6V), so the output of pin 3 of the output terminal of the 555 time base circuit is reversed is low level, VL2 goes out, the bidirectional thyristor VTH ends, the heater is powered off, and heating is stopped.
Application of thermostat controller
The characteristic of the thermostatic controller is that it can adjust the temperature of the system so that it can be kept in the temperature range required by itself. It can be set by the program so that the temperature within the range controlled by the controller can be used for various needs. It can be used for growing mushrooms, Raising chickens, growing flowers in greenhouses, growing vegetables, etc. For example, the temperature can be controlled within a certain range to simulate the temperature at which a hen hatches chicks for the hatching of chicks; it can also be used to simulate the germination, growth, and maturity of seeds, vegetables, and fruits, etc. The temperature conditions in each stage can obtain fruits and vegetables that are out of season or even unsuitable for local growth.
