25 Instruction Manual
instrument with default values except “instrument factor” and “network identification
number” parameter
4.9 How to use the damper
The damper acts as a filter for a stable reading. If ‘0’ is entered in window M40, that means
there is no damping. A bigger number brings a more stable effect. But bigger damper
numbers will prevent the instrument from acting quickly.
Numbers 0 to 30 are commonly used for the damper value. Default value is 10 seconds.
4.10 How to use the zero-cutoff function
The number displayed in window M41 is called the lower flow rate cut-off value. The flow
meter will replace these flow rate values that are absolutely less than the low-cutoff value
with ‘0’. This means the flow meter will avoid any invalid accumulation when the actual flow
is below the zero-cutoff value. Generally the default value is 0.03m/s
The low-cutoff value does not affect the flow measurement when the actual flow is
absolutely greater than the low-cutoff value.
4.11 How to setup a zero point
There exists a ‘Zero Point’ with certain installation which means the flow meter will display a
non-zero value when the flow is absolutely stopped. In this case, setting a zero point with
the function in window M42 will bring a more accurate measurement result.
Make sure that there is no liquid running inside the pipe, and then run the function in
window M42 by pressing the ENT key.
4.12 How to get a scale factor for calibration
A scale factor is the ratio between the ‘actual flow rate’ and the indicated value by the flow
meter. It can be determined by calibration with standard flow calibration equipment. You
may change the scale factor, press into menu window M45,input the scale factor.
The scale factor can be determined by calibration with flow calibration device.
