Flowmeters

Electromagnetics & Ultrasonics

Ultrasonics Flowmeters

FUJI ELECTRIC engineers, thanks to their long experience in ultrasonic measurement, have created the PORTAFLOW-C (portable type) and the TIME DELTA-C (fixed type). These instruments are based on transit-time measuring method and are particularly suitable for liquid flow measurement (temperature -40 to +200°C).

The sensors (Clamp-on type) are located outside the pipe, without need to cut or drill it for installation.

The 32 bits microprocessor based electronics allows a high accuracy (±1%), a response time of 1 second or less, a very good immunity to air bubbles (ABM system) and to change of fluid pressure and temperature (continuous calculation of sonic speed).

Measuring principle :

With ultrasonic pulses propagated diagonally between the upstream and downstream sensors mounted on the exterior of the pipe, the flow rate is measured by detecting the time difference caused by the flow

Electromagnetic flowmeters

In the chemical, pharmaceutical, paper, food, wastewater or drinking water treatment industries, the electromagnetic flowmeters can be used wherever one wishes to measure the flow of an electrically conductive liquid. Their main characteristics are, an excellent accuracy (±0,25 %), the total absence of pressure loss in the pipe, no moving parts, and a very good reliability.

To accommodate a large number of applications, a wide range of pipes is proposed :

- Tube diameter from 6 to 2000 mm,
- Several internal liners and electrode materials according to the characteristics of fuild to measure,
- Several kinds of process connection (DIN, ANSI or JIS flanges,

Tri-Clamp ™, DIN11851, ISO2852 or wafer connection).According the needs of user, different electronic converters, compact or remote version and with or without display, are available. The battery powered M5000 converter with autonomy from 6 to 12 years is the good solution for all applications of water counting.

Measuring Principle :

The operating principle of the electromagnetic flow meter is based on Faraday’s law of magnetic induction. The voltage induced across any conductor, as it moves at right angles through a magnetic field, is proportional to the velocity of that conductor. The voltage induced within the fluid is measured by two diametrically opposed internally mounted electrodes. The induced signal voltage is proportional to the product of the magnetic flux density, the distance between the electrodes and the average flow velocity of the fluid.

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