To keep your CO alarm in good working order, please
follow these simple steps:
• Verify unit alarm, lights and battery operation by
pushing the test button once a week.
• Vacuum the CO alarm cover with a soft brush
attachment once a month to remove accumulated dust.
• Instruct children never to play with the CO alarm.
Warn children of the dangers of carbon monoxide
poisoning.
• Never use detergents or other solvents to clean the
CO alarm.
• Avoid spraying air fresheners, hair spray, paint or
other aerosols near the CO alarm.
•
Do not paint the CO alarm.
Paint will seal the vents
and interfere with the sensor ability to detect CO.
• Do not place near a nappy bucket.
24
Caring for your Nighthawk
Battery Powered CO Alarm
The chart above relates to healthy adults. Levels differ for those
at high risk. Individuals with medical problems may consider
using detection devices with lower COHb alarming capabilities.
This CO alarm meets the alarm response time requirements of
BSI 7860. Standard alarms times are as follows:
At 45 PPM, the unit must not alarm before 60 minutes
At 150 PPM, the unit must alarm within 10-30 minutes
At 350 PPM, the unit must alarm before 6 minutes
WARNING:
This device may not alarm at low carbon monoxide
levels. The Health and Safety Executive (HSE) has established
that continuous exposure to levels of 50 PPM should not be
exceeded in an 8 hour period.
23
Alarm/Danger Levels
(cont.)
The maximum allowable concentration for
continuous exposure for healthy adults in
any 8-hour period, according to HSE*.
Slight headache, fatigue, dizziness, nausea
after 2-3 hours.
Frontal headaches within 1-2 hours, life
threatening after 3 hours.
Dizziness, nausea and convulsions within 45
minutes. Unconsciousness within 2 hours.
Death within 2-3 hours.
Headache, dizziness and nausea within 20
minutes. Death within 1 hour.
Headache, dizziness and nausea within 5-10
minutes. Death within 25-30 minutes.
Headache, dizziness and nausea within 1-2
minutes. Death within 10-15 minutes.
Death within 1-3 minutes.
50 ppm
200 ppm
400 ppm
800 ppm
1,600 ppm
3,200 ppm
6,400 ppm
12,800 ppm
Concentration
of CO in Air
(ppm = parts
per million)
Approximate Inhalation Time
and Symptoms Developed
* Health and Safety Executive
Benelux Guide 21/8/01 2:15 pm Page 23
