Greyline Portaflow PT400, Руководство пользователя

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3.6 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.
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. 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:S
Dim:mm
Signal
12.34
l/min
+Total: 300.0 litres
–Total: 0.00 litres