Heating device of constant temperature and humidity testing machine

The heating device is the key link to control the constant temperature and humidity testing machine. When the controller gets the heating command, it will output voltage to the relay, about 3-12v DC is applied to the solid-state relay. Its AC end is equivalent to the wire connection; The contactor is also switched on at the same time. There is voltage at both ends of the heater to make it heat up. The circulating fan drives the heat to the box to raise the temperature of the constant temperature and humidity testing machine, and the temperature will soon reach your set value. The controller is adjusted by adding the solid-state relay on and off. We can adjust the heat by looking at the heating output on the screen of the constant temperature and humidity test box; This is the temperature control above 89 degrees, and how to control the temperature stability below 89 degrees? constant temperature and humidity testing machine is on one side through the solid-state relay to generate heat output; on the other side, through the compressor refrigeration cycle to achieve dynamic balance; the temperature is constant.