Electromagnetic induction measurement method: pipeline electromagnetic flowmeter, plug-in electromagnetic flowmeter

The medium of flow rate v flows in the pipe, and the two electromagnetic coils M outside the pipe generate a constant magnetic field B. According to Faraday's law, an induced voltage is generated between the electrodes E1 and E2 under the action of the magnetic field M and the conductive medium. The magnitude of the induced voltage is proportional to the flow rate of the medium (and thus also the flow rate). The transmitter amplifies the voltage signal and converts it into a standard signal (eg 4-20 mA).
Electromagnetic induction flow sensors are available in both ducted and plug-in versions. The induced voltage of the pipe type electromagnetic flowmeter is made up of two on the pipe wall
Plug-in electromagnetic flowmeter
Pipeline electromagnetic flowmeter
e = K x B x L x V
B = magnetic field strength (constant, related to structure)
L: conductor length (distance between electrodes E1 and E2)
K: constant
V: flow rate (fluid flow rate)
Oval gear measurement principle with pulse output
permanent magnet
Oval gear
Dedicated housing Hall element
The advantage of face-to-face electrodes is that full flow characteristics can be detected and the measured flow rate is very accurate.
The two parallel electrodes on the plug-in electromagnetic flowmeter are located in the lower part of the cylindrical measuring probe, and the cylindrical measuring probe is mounted vertically on the pipe. The plug-in electromagnetic flowmeter is very compact and can be easily installed in piping systems.
Electromagnetic flowmeters are suitable for flow measurement of almost all conductive media and even for heavily contaminated media. Only non-conductive media, media that produce coatings, and highly abrasive media are not suitable for electromagnetic flow measurement.