Integrating instrument circuit of differential pressure flowmeter

The utility model discloses an integrating instrument circuit of a differential pressure flowmeter. The integrating instrument circuit comprises an external power supply circuit, a 485 driving voltage circuit, a battery-powered circuit, a 4-20 mA current flow signal processing circuit, a key circuit, a CPU chip data processing circuit, a 485 communication circuit, a temperature signal acquiring and processing circuit, a pressure signal acquiring and processing circuit, a temperature, pressure, standard condition flow and working condition flow frequency signal output circuit, a concentration sensor signal input circuit, an anti-static circuit and signal output processing circuits. The integrating instrument circuit is used for not only metering the total volume of gas but also correcting the concentration of the gas.