Automatic start and stop device of electric heater

The invention provides a control device for automatic start and stop of an pressure regulating system electric heater in a gas transmission field, and automatic control of processing equipment is realized. According to the embodiment, an orifice plate sensor is installed on the downstream of pressure regulating equipment, and a pressure difference signal of the orifice sensor is used as a control command signal for the start of the electric heater. When a pressure regulating valve starts to work, gas flows in a pipeline, a static pressure difference is generated between two sides of an orifice plate; a differential pressure transmitter collects the differential pressure value, converts the differential pressure value into a 4-20 mA signal and uploads the signal to an electric heater control system; and when the differential pressure value reaches or exceeds a set value, the electric heater automatically starts. The electric heater control system carries out PID automatic control according to a heater outlet t