5
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
