Electromagnetic flowmeter with blank pipe detection circuit

The electromagnetic flowmeter comprises a control module, the control module comprises a micro-control processing module, the empty pipe detection circuit, a signal conditioning module and an excitation conditioning module, the empty pipe detection circuit, the signal conditioning module and the excitation conditioning module are electrically connected with the micro-control processing module, and the excitation conditioning module comprises a constant current source circuit. And the signal conditioning module comprises a signal amplification circuit and a signal filtering circuit of at least two amplification circuits. According to the invention, an empty pipe detection function can be realized through the empty pipe detection circuit, empty pipe judgment can be completed only by reading high and low levels so as to carry out empty pipe protection, power consumption is reduced, the system is kept stable and safe, and the circuit has the advantages of small imbalance, small temperature drift and good linearit