3.0 Monitor Configuration :-
The Airflow monitor menu contains a parameter group called “ Cal Configure” that
contains all of the parameter settings that may need to be adjusted to complete a
successful calibration. The following list shows the parameters and their functions. Refer
to the full parameter list in section 6.0 to see the default factory settings.
To access the Cal config menu – (From Run screen) Press Enter for 5
secs/Setup/Configure/Password (000)/Cal Config.
1. Display Units – Face velocity display units – fpm or m/sec.
2. Low Air Alarm – Sets the low air alarm velocity value – typically 70-80% of the
design velocity.
3. Low Air Cut Off - When enabled inhibits the face velocity reading from being
displayed below the selected value – for example, Low Air Cut Off enabled and set to
30fpm, the display will stop reading velocity below 30fpm. This function is useful in
situations where the hood blower is switched off and there is still a flow through the
hood either from positive room pressurization or from other influences and the
monitor is not required to display velocity. Typically set to a low value e.g. 30 fpm.
4. Warning Air Alarm – Sets the warning air alarm velocity value – typically 80-90%
of the design velocity.
Warning Air Reset – Sets the reset differential value – this is the value that the
monitor resets into Air Safe above the Air Fail alarm point on rising airflow.
5. High Air Alarm – Enables and sets the high air alarm velocity value – typically not
used.
6. Low Air Fluctuations – This parameter monitors the fluctuations in airflow during
the low air calibration point. The monitor samples the airflow for 5 seconds and
averages the airflow readings, if any of the fluctuations different from the average by
more than the parameter value the calibration will be stopped and a “Fluctuations too
high” message will be shown with option of retry or cancel calibration.
7. High Air Fluctuations – This parameter monitors the fluctuations in airflow during
the second air calibration point. The monitor samples the airflow for 5 seconds and
averages the airflow readings, if any of the fluctuations different from the average by
more than the parameter value the calibration will be stopped and a “Fluctuations too
high” message will be shown with option of retry or cancel calibration.
8. Low High Diff – This parameter sets the difference required between airflow
samples during calibration. If the value entered during the second calibration point
too low a “Low High Diff too low” message will appear and the calibration will be
stopped.
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