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4� Operation; 4�1 Monitoring Condition; Display Screens - Honeywell Impact Series Operating Instructions And Maintenance Manual

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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:
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 (
)
02
%V/V
FLM
20.9
0
CO
ppm
H2S
This screen will alternate with a screen showing the minimum value of oxygen. In
this case the
is replaced by
STEL Screen ( )
0
CO
ppm
H2S
LTEL Screen ( )
0
CO
ppm
H2S
Impact / Impact Pro / Impact Pro IR Operating Instructions
02
%V/V
20.9
0
CO
ppm
%LEL
This symbol is displayed when the instrument is displaying
0
the peak readings for the sensors, i.e. the highest
readings seen since the instrument was switched on or
0
since they were reset. This is useful for pre-entry checks
ppm
for confined space entry. These readings can be reset by
pressing the 3 button while this display is shown.
.
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
0
reference period. It is used to monitor exposure to toxic
gases in line with current regulations and/or legislation.
ppm
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
0
reference period. It is used to monitor exposure to toxic
ppm
gases in line with current regulations and/or legislation.
FLM
%LEL
0
0
ppm
H2S
23

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