User manual

12
UNDERSTANDING
THE PRODUCT’S
INDICATORS
Digital Display
The LCD screen has many icons with one or
more being shown at any one time.
Bar Graph to show early build up of CO
To understand the role of the product indicators
please refer to section ‘Carbon Monoxide and
howitcanaffectyourfamily’onpage3.The
alarm has a bar graph which mimics the way
CO levels build up in the blood stream. The
response times of the alarm are determined by
theEuropeanStandardBSEN50291:2001
so the alarm will only sound when it has
detected CO for a prescribed length of time,
the higher the level of CO the quicker the
alarm must sound. However with FireAngel’s
CO-9D there is an early visual warning that
CO is present. When CO is first detected the
alarm indicates it’s presence by displaying the
level on the screen in parts per million (ppm).
If CO continues to be present additional bars
will appear on the graph. When the graph is
reach 50ppm, as long as the display shows a
reading of CO then you can be confident that
the alarm is working correctly. If you have
any questions about testing the sensor please
contact the technical support team (see page
21 for freephone and email contact details).