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Operating Instruction
2.3 Heat-up phase sequence
The initialisation sequence is identical for
every start. As it progresses, the analogue
bar display expands towards the right ac-
ross the scale. Once the maximum value
has been reached, the device switches to
measuring mode.
2.3.1 Light-emitting diode chain displays
In the chain of light-emitting diodes - loca-
ted between the sensor head and the swit-
ching buttons - the first diode shows the
"operation" .
If traces of gas are detected, this is shown
in the display and additional diodes are ac-
tivated depending on the concentration. The
acoustic signal (which can be deactivated)
means that the increase can also be heard.
When switching on, all the diodes light
<
up initially as a function check.
After the heat-up phase of approx.
<
45 seconds is completed, only the green
diode remains lit, indicating operational
15
readiness. 0 ppm becomes visible in the
display
When a gas concentration arises and
<
increases, this is indicated in threshold
stages, from over 100 and 1000 ppm up
to 1 vol% (10000 ppm)
At the same time, the increase in gas
<
concentration is indicated by the change
in the acoustic signal.
2.4 Measuring operation
The time sequence of the heat-up phase is
tracked using the analogue bar that builds
up from the left to the right. After the heat-up
phase, the sensor zero point is determined
and applies as the fresh air reference value
for continued measuring operation.
All threshold LEDs are only active at the
start. The first roughly estimated measure-
ment value is available after approx. 12 se-
conds and can only be displayed using the
threshold LEDs.
Once the heat-up phase is completed, the
device immediately switches to measuring
mode. Here, a low gas concentration under
999 is displayed in ppm and over 999 ppm
is displayed in vol%, starting with 0.1 vol%.
In the target gas-free atmosphere, the device
should display 0 ppm.
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