11
3 Measuring operation
3.2
Operating modes
WARNING
z
Warning of high gas concentration in buildings and the work
-
ing environment
z
Testing enclosed spaces
z
all alarm thresholds are acti-
vated
NB:
z
the current gas concentration
is displayed:
- as a figure
(e.g.:
1500 PPM H2
)
- as a trend bar
z
every 5 seconds an operating
signal - both acoustic (item 7)
and optical (item 1) - is emitted
to confirm that the instrument
in functioning in the
warning
operating mode. If this ope-
rating signal is not emitted,
you cannot be sure that the
gas concentration is being
properly monitored and must
leave the endangered area
without delay.
H2
PPM
1500