3: Operating Procedures
Portaflow 220 User Manual 21
(Issue 1.0)
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 to 199,
with a default setting of 10. With the system running in FLOW READNG mode:
Drawn steel pipes:
• Fine planed, polished surface
• Plane surface
• Rough planed surface
0.01
Welded steel pipes, new:
• Long usage, cleaned
• Lightly and evenly rusted
• Heavily encrusted
0.1
Cast iron pipes:
• Bitumen lining
• New, without lining
• Rusted / Encrusted
1.0
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 Enter 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
Totaliser : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.01
Diagnostics
Exit
1. Press the Options key to access the FLOW
READING OPTION screen shown.
2. Scroll down and select Damping (secs).
3. Change 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.
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
Totaliser : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.01
Diagnostics
Exit
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.
Pipe Material Roughness Factor
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