MID-EX-GC

Overview C-series Applications Technical data Measuring principle Documentation Contact persons

Electromagnetic large flow transducer of the C‑series
- Measuring principle

All Kirchgaesser flow meters work in accordance with the electromagnetic measuring principle, which is based on Faraday's law of induction and has been used successfully around the world for 50 years. The measuring principle offers the great advantage that there are no moving parts in the measuring tube. The devices therefore do not have to be maintained and can also measure solids-laden liquids.

Measuring principle

In accordance with the electromagnetic measuring principle, the conductive liquid to be measured correlates with the movement of the conductor. The magnetic field (B) is induced on both sides of the measuring tube through two exciting coils with a constant strength of current. Vertical to this, there are two measuring electrodes on the inner wall of the pipe, which tap the voltage generated (Ue) when the conductive liquid is flowing. The size of the measured voltage generated is proportional to the flow velocity (v) of the measurement medium, but is independent of its conductivity (from a value of 5 uS/cm).
Conductive liquids that can be measured include water, sludges, pastes, pulps and emulsions.
Non-conductive liquids, such as oil, cannot be measured.

Advantages

Free pipe cross-section (can be cleaned with pigs)
No moving parts
No maintenance and service
Also, solids-laden fluids are measurable (e.g. ore sludge)
Measuring principle practically independent of pressure, density, temperature, viscosity and direction
Various mounting position
High reliability and accuracy
Very high dynamic range
No pressure drop