JC091 insertion electromagnetic flowmeter is a new fluid flowmeter developed based on a pipe-type electromagnetic flowmeter. Besides preserving the merits of the pipe-type electromagnetic flowmeter and considering such defects of pipe-type electromagnetic flowmeter as difficult installation on large pipes and high cost, JC091 flowmeter measures mean fluid flow rate in the electromagnetic method according to NIKURADS principle, so as to obtain the fluid volume flow. In particular, after technologies of hot tapping and installation under pressure are applied, the insertion electromagnetic flowmeter can be installed without conducting shutdown or cutting off the water supply as well as on cast iron pipe or cement pipe. The successful development of the insertion electromagnetic flowmeter provides a new means for inspection of fluid flow.
Compared to the ordinary electromagnetic flowmeter, the sensor of the insertion electromagnetic flowmeter generates an external emission magnetic field on the outer side. The measuring electrodes are at the ends or on both sides of the sensor. The principle of electromagnetic flowmeter is shown in the figure below. It is noteworthy that in an external emission magnetic field, the induction signal of electromagnetic flow sensor will reduce the linearity of measurement in case of being affected by fluid and thickness of the magnetic field’s boundary layer.
In terms of JC091 insertion electromagnetic flowmeter, conducting liquid in the pipeline is the conductor moving in the magnetic field, and the distance between two electrodes is the length (L) of the conductor.