3: Operating Procedures
22 Portaflow 220 User Manual
(Issue 1.0)
3.6 Performing Monitoring Functions
3.6.1 How to measure totalised flows (manually)
The basic measurement indicated on the FLOW READING screen is the instantaneous flow rate, which in
some applications may vary over a period of time. Average flow rates are therefore often required in order to
get a better understanding of an application’s true performance. This is simply achieved by noting the total
flow over a specific period (for example 30-60 minutes) and then calculating the average flow rate over that
period of time.
Calculating the average flow
To calculate the average flow wait for the allotted monitoring period to expire then divide the indicated total
flow by the time taken. This will give you the average flow in m/s, galls/hours or whatever units you select.
Note that in a bi-directional flow situation you must take the difference between the indicated positive and
negative flow totals before carrying out the average flow rate calculation.
How to stop the totaliser temporarily
If, for operational reasons, you want to stop the totaliser function temporarily set the Totaliser option to
Stall in the FLOW READING OPTIONS screen as described above. This will stop the totaliser operation
without affecting its current values.
1. Press the Options key to access the FLOW
READING OPTION screen shown.
2. If the Totaliser is indicating Run, select it
and change it to Stall. Press ENTER.
3. Select Reset +Total and press ENTER.
4. Press ENTER on the subsequent screen to
accept the reset.
5. Press ENTER again to return to the FLOW
READING OPTIONS menu.
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 : Stall
Reset +Total
6. Select Reset –Total and press ENTER.
7. Press ENTER on the subsequent screen to
accept the reset.
8. Press ENTER again to return to the FLOW
READING OPTIONS menu.
9. Note and record the current time.
10. Select Totaliser and change it to Run
then press ENTER.
Note: the totalisers begin to count up as
soon as Totaliser is put to Run.
FLOW READING OPTION
DD-MM-YY HH:MM:SS
Zero Cutoff (m/s) : 0.00
Set zero flow (m/s) : 0.00
Damping (secs) : 10
Totaliser : Run
Reset +Total
Reset –Total
11. Scroll down and select Exit to return to the
FLOW READING screen which will now
indicate the instantaneous flow together
with the totalised flow.
Note that in some installation the measured
flow can be in either direction. Where this is
the case the upstream flow is shown
separately in the –Total field.
FLOW READING
DD-MM-YY HH:MM:SS
Dim: mm
Signal
l/min
+Total: 300.0 litres
–Total: 0.00 litres
To Next Page
Loading...
Need help?
General
