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3.0 General Description
All systems comprise of the following components :-
1 – In-line Airflow Sensor,
1 – AFA1000 Alarm unit,
1 – AC power supply
If the Sash Alarm System option is included there will also be a sash micro switch
or proximity switch.
Operator Features --- the alarm has the following operator features :-
Digital Display
The digital display is a back-lit, full graphic unit with a visual display of approx
2.2" x 1.18 ". The display operates through the software allowing the generation
of figures, wording and Icons.
The display shows the fume hood face velocity in m/sec or fpm when enabled
or the alternative with no velocity reading but showing LOW AIR / NORMAL as
continuous display.
All of the above are configurable via the alarm key pad.
An ‘ event time line ’ segmented into 20 x 3 minute segments will scroll across
the display ( when enabled) .This takes the form of a graphical ‘ blip’ that will
progress from the right hand side to the left hand side – representing events that
have occurred during the past hour. On the standard alarm this will be limited to
airflow alarms but other alarms are available.
The alternative to the event time line is a dynamic ‘ bar graph ’ representing the
face velocity
The display shows a Horn icon ( with line through it ) when the audible alarm is in
the Muted condition
Sash High – will be displayed when the Sash alarm is enabled and the sash
is raised above the max safe working opening.
This display will alternate on/off with the velocity reading.
Ext Alarm – will be displayed when the external alarm input is activated ( when
enabled )
This display will alternate on/off with the velocity reading
Low Air - will be displayed if the airflow is less than the Low air alarm point.
This display will alternate on/off with the velocity reading
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