3: Operating Procedures
U3000/U4000 User Manual 23
(Issue 2.0)
With the system running in FLOW READING mode:
1. Press the Options key to access the
FLOW READING OPTION screen shown.
2. Scroll down and select Roughness
factor then press ENTER.
3. Change the roughness factor according to
the pipe material and condition as
described above.
4. Press ENTER to apply the change.
3.3.5 Adjusting the damping factor
By averaging-out the flow rate over several seconds, the Damping factor can be used to smooth out
rapid changes in flow rate to prevent wild fluctuations in the displayed flow value. It has a range of 10 to 100
seconds, with a default setting of 10. With the system running in FLOW READING mode:
1. Press the Options key to access the
FLOW READING OPTION screen shown.
2. Scroll down and select Damping (secs)
and press ENTER. This will open the
DAMPING OPTION screen.
3. Select the value of the Damping factor
as required to remove any unwanted
display fluctuations. Increasing the value
applies a greater smoothing affect.
4. Press ENTER to apply the change.
Key Point: If the damping factor is set too high the value displayed may appear
stable but might exhibit large step changes when the value is updated.
FLOW READING OPTION DD-MM-YY HH:MM:SS
Data review
Zero Cutoff (m/s) : 0.010
Set zero flow (m/s) : 0.000
Damping (secs) : 10
Totaliser : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.010
Alarm Settings :
Max Pulse Freq (Hz) : 10.00
Flow at Max Frequency : 200.00
Calculated Pulse Value: 2.00
Diagnostics
Exit
FLOW READING OPTION DD-MM-YY HH:MM:SS
Data review
Zero Cutoff (m/s) : 0.010
Set zero flow (m/s) : 0.000
Damping (secs) : 10
Totaliser : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.010
Alarm Settings :
Max Pulse Freq (Hz) : 10.00
Flow at Max Frequency : 200.00
Calculated Pulse Value: 2.00
Diagnostics
Exit
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