Chapter 2 Working Principle
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Chapter 2 Working Principle
When the measured liquid flows through the flow meter sensor, its internal impeller
rotates with the help of liquid kinetic energy. At this time, the impeller blade causes
the magnetic resistance in the detection device to change periodically. Therefore,
an electric pulse signal proportional to the flow rate is induced at both ends of the
detection coil, and is amplified by the preamplifier then sent to the display unit. The
single chip microcomputer system in the display unit calculates according to the
number of pulses measured and the meter coefficient K of the flow meter, and
displays the instantaneous flow rate and the accumulated total amount.
The relationship between the meter coefficient and instantaneous flow, frequency,
pulse number, and cumulative total is:
K=f/Q and K=N/V
In the formula:
f—flow signal frequency (Hz)
Q—instantaneous flow rate (m3/s, or /L/s)
N—pulse number
V—Total volume (m3)
K—Meter coefficient(1/m3 or 1/L)
