Dwyer Series PUF - Manual (Page 27)

3: Operating Procedures
23
With the system running in FLOW READING mode:
3.5.5 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 1, 10, 15, 20, 30, 50,
seconds, with a default setting of 10.
With the system running in FLOW READNG mode:
1. Press the Options key to access the FLOW
READING OPTION screen shown.
2. Scroll down and select Roughness factor.
3. Change the roughness factor according to the
pipe material and condition as described above.
4. Press the ENTER key to apply the change.
FLOW READING OPTION DD-MM-YY HH:MM:SS
Data review
Zero Cutoff (m/s) : 0.00
Set zero flow (m/s) : 0.00
Damping (secs) : 10
Totalizer : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.01
Diagnostics
Select Totals : Both
Exit
1. Press the Options key to access the FLOW
READING OPTION screen shown.
2. Scroll down and select Damping (secs).
3. This will open the DAMPING OPTIONS screen.
FLOW READING OPTION DD-MM-YY HH:MM:SS
Data review
Zero Cutoff (m/s) : 0.00
Set zero flow (m/s) : 0.00
Damping (secs) : 10
Totalizer : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.01
Diagnostics
Select Totals : Both
Exit
4. Select the value of the Damping factor as
required to remove any unwanted display
fluctuations. Increasing the value applies a
greater smoothing affect.
5. Press the ENTER key to apply the selection and
return to the FLOW READING OPTIONS screen.
DAMPING OPTIONS DD-MM-YY HH:MM:SS
1 second
10 seconds
15 seconds
20 seconds
30 seconds
50 seconds
Key Point: If the damping factor is set too high, the value displayed may appear
stable but it may exhibit large step changes when the value is updated.