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4.3.2 When the detected gas concentration is higher than the pre-
set
low alarm value
and less than the
high alarm value
[Note: when
the oxygen concentration is lower than the low alarm value], the
detector is in a low alarm state. The audible alarm will sound, the
red-light flashes synchronously, and the gas concentration value
on the screen changes the colour to yellow. In addition to this, the
back light is illuminated, and the vibrator is also activated, to
indicate low alarm; press "
" key to mute, but the alarm will still
be displayed. If a new alarm is triggered, the buzzer is resumed
and the alarm light, the vibrator is re-activated. When the detector
detects the gas concentration has fallen below the low alarm value,
the gas concentration value colour turns green, the alarm signal will
be released automatically. Alarm state shown in Figure
4
.
Fig. 4
.
