4�3 Alarm Condition; Latching Alarms (Default); Non-Latching Alarms; Vibrating Alarm (Where Fitted) - Honeywell Impact Series Operating Instructions And Maintenance Manual

4�3 Alarm Condition
There are two modes of alarm: latching and non-latching. However, the display will
give the same alarm indication:
02 %V/V
1
3
CO ppm
Any alarm will cause the backlight to be switched on automatically.
4�3�1 Latching Alarms (default)
In the latched condition, once an alarm occurs both audible and visual alarms
continue to operate even after the atmospheric hazard has cleared. Pressing any
of the instrument buttons will clear an alarm. Any subsequent alarm will reactivate
the audible and visual alarms.
4�3�2 Non-latching Alarms
In this mode, should a gas alarm occur the instrument would enter an alarm condition.
When the readings return to normal levels the audible and visual alarms will stop.
4�3�3 Vibrating Alarm (where fitted)
If this option is fitted to the instrument, any alarm condition that activates the audible
and visual alarms will also activate the built-in vibrating alarm.
4�3�4 Resetting an Alarm
If an alarm condition occurs it is possible to cancel the alarm by pressing any of the
buttons, once the gas measurements have returned to a safe level. Otherwise, the
instrument will remain in the alarm condition, but the audible alarm will be muted.
Any subsequent alarms that occur 1 second after the previous alarm has been reset
will reactivate the audible alarm.
4�4 Fault and Warning Condition
In addition to the gas alarms, the Impact includes a number of auxiliary alarms
to safeguard proper use of the instrument. At switch-on, the Impact performs an
electronic self-test that assures the user of proper performance. When the Impact
detects that an electronic fault or failure condition has occurred, the audible and
visual alarms are activated and an explanatory message will be displayed.
CAutIoN
As the Impact is designed to protect from potentially life-threatening atmospheric
conditions, any alarm conditions must be taken seriously.
26
An alarm symbol will appear in the relevant section of
FLM %LEL
the display. The alarm symbol contains a number,
2 indicating the increasing severity of the alarm, with
0
increasing frequency of the audible and visual alarms.
If there is a STEL/LTEL alarm the relevant icon will
ppm
H2S
appear and flash.
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