Aktek TB3WE Gebruikershandleiding - Pagina 4

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1.3 Working Principle

When liquid flows through the casing of sensor, the impulse of fluid will provide the

blade with a rotation moment as there is an angle between the blade of impeller and

the flow direction. The blade will rotate as the friction moment and the fluid

resistance are overcome and it will reach a stable speed when the moments are at

balance. Under certain conditions, the rotation speed of blade will be in direct

proportion to the flow velocity. Due to the magnetic conductivity of blade, when

located in the magnetic field generated by signal detector (made of permanent magnet

steel and coils), the rotating blade will cut the magnetic lines and periodically change

the flux through the coil, thereby inducing electrical impulse signals at both ends of

the coil. The induced signals, after amplified and rectified by amplifier, will form a

continuous rectangular impulse wave with certain amplitude which may be remotely

transmitted to display instrument indicating the instant flow and the cumulative flow

of fluid. Within a certain range of flow, the impulse frequency f is in direct proportion

to the instant flow of fluid flowing through the sensor, which is shown in the equation

below:

 3600



Wherein:

f- Impulse frequency [Hz];

k- Instrument factor of sensor [1/m3], which is given by checklist. If [1/L] is used as

 6 .



the unit, the equation will be:

Q- Instant flow of liquid (in operation) [m3/h];

3600- Conversion factor.

Instrument factor of each sensor will be filled out in verification certificate by the

manufacturer. The instant flow and cumulative flow will be displayed when the value

of k is loaded into associated display instrument.

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