6 performing monitoring & logging functions, 1 how to measure totalized flows (manually), Ragraph 3.6) – Dwyer Series PUF User Manual
Page 28: Zed flows – paragraph 3.6.1, Operating procedures
3: Operating Procedures
24
3.6
Performing Monitoring & Logging Functions
This procedure shows you how to set up a basic logging session under manual start/stop control.
Logged data is saved to the instrument’s memory and can be downloaded to a PC at a later time. Either
-Flow Rate or +Flow Rate and ±Totals can be logged to Memory, RS232 or both. Totals are always logged and
can be selectively down loaded after the logging has stopped.
3.6.1 How to measure totalized 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 to 60 minutes) and then calculating the average flow rate over that period of time.
Key Point: To view the totals on the screen and send them to the RS232/USB output
as they are logged, you have to select the required option in the Data Logger menu
before setting up the flow reading.
1.
Press the
Options key to access the FLOW
READING OPTION screen shown.
2.
If the
Totalizer is indicating Run, select it and
change it to
Stall. Press the ENTER key.
3.
Select
Reset +Total and press the ENTER
key.
4.
Press the
ENTER key from the subsequent
screen to accept the reset.
5.
Press the
ENTER key 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
Totalizer : Stall
Reset +Total
6.
Select
Reset –Total and press the ENTER
key.
7.
Press the
ENTER key on the subsequent screen
to accept the reset.
8.
Press the
ENTER key again to return to the FLOW
READING OPTIONS menu.
9.
Note and record the current time.
10. Select
Totalizer and change it to Run. Press
the
ENTER key.
Note: the totalizers begin to count up as soon as
Totalizer 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
Totalizer : Run
Reset +Total
Reset –Total