Temperature controller Gxp - 902 has two temperature sensors, temperature sensors A, temperature sensor B. 
 A temperature sensor when the temperature is higher than the temperature sensor B when the temperature of 1 ℃, the controller work, turn on triac output voltage of 220 volts. This voltage can drive 800W load. Instrument design for the rectangular 60 × 40 × 35 mm into the module type. Equipment using switching power supply, the AC voltage into a 220-volt temperature controller for DC power supply required, SCR no contact control. Box with two lights, when connected to AC 220 volts, the yellow indicator light, said switching power supply is working properly, temperature controller has normal power supply. A sensor when the sensor temperature is higher than B when the temperature of 1 ℃, temperature controller, start control, and SCR conduction, the output voltage of 220 volts AC. A sensor when the temperature decreases to less than or equal to B when the temperature sensor, temperature controller to return to the starting state. 
 The products are small, light weight, high sensitivity, high accuracy, in the 0 ~ 50 ℃ temperature accuracy of better than using the ± 0.3 ℃. Safe, reliable, long life.