Impact / Impact Pro / Impact Pro IR Operating Instructions
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4�1�3 Confidence Signal
To ensure correct operation the instrument monitors itself and will confirm correct
operation by giving an audible and green visual confidence signal once every 30
seconds. The confidence signal is given when the instrument is able to detect gas
(for example the confidence signal will not be given during pump or sensor calibration
phases, or if the sensors are in warm-up).
There is a configurable option to silence the audible confidence signal but the visual
confidence signal will still operate. If the instrument is in a low battery condition the
confidence signal will occur twice every 30 seconds.
Note
The audible confidence signal is the primary indication that the
instrument is functioning correctly. It is therefore strongly recommended
that this feature not be disabled.
4�1�4 Go/No Go Option
A configurable option is available which replaces the numeric values with a 3 symbol
when everything is OK and 8 when there is or has been an alarm or fault, as shown
below. All alarms operate as normal, but other functions and menus are disabled.
This display now also shows the battery capacity as follows.
The Go / No Go Option is configured using the Impact Configuration Utility (ICU)
PC software from the Configuration Screen.
4�2 Atmospheric Alarm Conditions
CAUTION
The Impact portable gas detector has been designed for the detection of oxygen
deciencies and enrichments, ammable and toxic gas levels. An alarm condition
indicating the presence of one or more of these potentially life-threatening hazards
should be taken seriously.
In the event an alarm is activated when the measured gas concentration exceeds the
pre-set alarm point.
A rapid increase in reading followed by a declining or erratic reading may indicate a
hazardous combustible gas concentration that exceeds the measuring range of the Impact
(i.e. greater than 100%LEL Methane). In the event of the instrument being exposed to a
veryhighlevelofammablegasthefollowingbehaviorwillbenoted.
Warning 54 (low O•
2
) and an alarm condition will be indicated. Warning 52 (sensor
over-range) and an alarm condition will be indicated.
The ammable readingwillbelatched to 100%LEL Methane with an alternating•
cross on the channel.
For other sensors reading greater than the measurement range, ‘sss’ alternating with
the full-scale reading will be displayed.
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