Micronics portaflow 220, User Manual

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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
12.34