Impact / Impact Pro / Impact Pro IR Operating Instructions
23
4� Operation
Note
Wherever the manual says ‘select’, the procedure is to use the s and t
buttons to cycle through the list, and then press 3 to select the required
option.
4�1 Monitoring Condition
4�1�1 Display Screens
With no alarm conditions the display will typically show:
020.9
00
02
CO
%V/V
ppm
FLM
H2S
%LEL
ppm
The gas sensors and their respective units are displayed, complete with a battery
gauge monitor at the bottom. For an instrument fitted with less than four sensors
each unused sensor position will show ‘---‘.
Several data screens are available and these can be viewed by pressing the s
and t buttons to cycle through. The symbol in the center of the screen will identify
which screen is active.
Peak Screen (
)
020.9
00
02
CO
%V/V
ppm
FLM
H2S
%LEL
ppm
�
This symbol is displayed when the instrument is displaying
the peak readings for the sensors, i.e. the highest
readings seen since the instrument was switched on or
since they were reset. This is useful for pre-entry checks
for confined space entry. These readings can be reset by
pressing the 3 button while this display is shown.
This screen will alternate with a screen showing the minimum value of oxygen. In
this case the
is replaced by
.
STEL Screen ( )
This symbol is displayed when the instrument is displaying
the STEL readings for the toxic sensors. The STEL is a
time weighted average, measured over a 15 minute
reference period. It is used to monitor exposure to toxic
gases in line with current regulations and/or legislation.
LTEL Screen ( )
This symbol is displayed when the instrument is displaying
the LTEL (TWA) readings for the toxic sensors. The LTEL
is a time weighted average, measured over an 8 hour
reference period. It is used to monitor exposure to toxic
gases in line with current regulations and/or legislation.
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