PCE Instruments PCE-TDS 200 Series User Manual page 45

N method
W method
1 Upstream sensor, 2 Sensor distance, 3 Downstream sensor, 4 Flow direction
The more frequently the sound crosses the liquid, the more accurately even very small flow
velocities can be measured. However, the signal strength decreases with each crossing, which is
why the W and N method cannot be used for every pipe, for example.
It is recommended to use the V method if the pipe parameters allow it as this produces the best
results in terms of signal quality and zero point stability. However, if the signal quality is too low,
the Z method can be used.
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