When CO concentration is more than 550 PPM, it is very dangerous.
1.3.1.6 Testing operation
It indicates testing is in progress.
1.3.1.7 Fault warning
It indicates fault warning.
1.3.1.8 End-of-life warning
It indicates end of unit life, and the product needs to be replaced.
1.3.1.9 Power-up prompt
When batteries are installed and the detector is powered up, power-
up prompt will be given. It indicates that the power supply is normally
connected, and the indicator lights and buzzer are working normally.
The LCD display shows ”EN”.
1.3.1.10 Battery level
When the detector is in normal operation, the Power indicator flashes
every 45 seconds. If low concentration of CO is detected but alarm
has not been triggered, the interval will be less than 45 seconds.
The LCD display shows battery level all the time.
1.3.1.11 Low battery warning