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4.3.1when gas detector detects the gas less than the low alarm (
Mark: for oxygen, between the low alarm and high alarm value), g
as detector is under normal detecting state, no alarm at this time.
4.3.2 When the detected gas concentration is higher than low
alarm value and lower 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 buzzer emits an alarm sound
of “beep,beep...” every 0.5s, and the red alarm light flashes
synchronously. At the same time, the gas concentration value on
the screen turns yellow and the backlight and vibrator are also
turned on remind of low alarm; press button to cancel the
audible alarm, but still display alarm information. The buzzer will
resume ringing until the new alarm is triggered, and the alarm light
and vibrator will resume operation. When the gas concentration
value detected by the detector returns below the low limit alarm
value, the gas concentration value turns green and the alarm
signal is automatically released. When the alarm is detected, the
detector is shown in Figure 4.
4.3.3 When the detected gas concentration is higher than the set
high alarm value, the detector is in the high alarm state, at this
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