Electromagnetic induction-based flowmeter:

The induction-based flowmeter BM-2 operates on the principle of electromagnetic induction. This type of flowmeter is used to measure rates of flow of electrically conductive liquids. They are particularly suitable for applications where conventional mechanical types are not sufficiently reliable and accurate and also when pressure drop is not acceptable.
The only factor limiting their applicability is a certain minimum electric conductivity of the liquid to be measured and content of ferromagnetic particles not exceeding a certain very low maximum level.
The induction-based flowmeter BM-2 consists of a flowtube sensor and electronic converter, mutually interconnected by means of cable. The microprocessor controlled converter is provided with digital display, five push buttons, interface connector RS232 and terminals for connecting the sensor to external input/output equipment.