7
/
8
be identified and corrected. Unless the reason for the alarm is obviously spurious, do not use the fuel-burning appliances again, until they
have been checked and cleared for use by a competent person according to national regulations.
General maintenance
To keep your CO alarm in good working order, please follow these simple steps:
1: Verify the unit's alarm sound and indicators operation by enable the TEST&SILENCE button once a week.
2: Remove the unit from the wall and clean the alarm cover and vents with a soft brush attachment once a month to remove dust and dirt.
3: Never use detergents or other solvents to clean the unit.
4: Avoid spraying air fresheners, hair spray or other aerosols near the CO alarm.
5: Do not paint the unit. Paint will seal the vents and interfere with the sensor's ability to detect CO. Never attempt to disassemble the unit or
clean inside. This action will void your warranty.
6: As soon as possible, place the CO alarm back in its proper location to assure continuous protection from carbon monoxide poisoning.
7: When household cleaning supplies or similar contaminants are used, the area should be ventilated.
WARNING: If the apparatus is tampered with, this have the risk of malfunction electric shock or malfunction.
WARNING: The following substances can affect the sensor and may cause false actions: methane, propane, isobutene,
isopropanol, ethylene, benzene, toluene, ethyl acetate, hydrogen sulfide, sulfur dioxides, alcohol based products,
paints, thinner, solvents, adhesives, hair sprays, after shaves ,perfumes and some cleaning agents.
WARNING
：
Your CO alarm will not be operational and will not monitor for CO levels without battery.
WARNING: This apparatus is designed to protect individuals from the acute effects of carbon monoxide exposure. It will not fully
safeguard individuals with specific medical conditions. If in doubt consult a medical practitioner.
Health effects of carbon monoxide (CO)
1: Toxic effects
Carbon monoxide (CO) is a colourless, odourless, non-irritating gas classified as a chemical asphyxiant and whose toxic action is a direct
result of the hypoxia produced by a given exposure.
CO is rapidly absorbed through the lungs, diffuses across the alveolar capillary membrane and is reversibly bound with haemoglobin as
carboxyhaemoglobin (COHb), however, a minute amount is present in the plasma.The affinity of haemoglobin for CO is over 200 times its
affinity for oxygen. This reduces the oxygen carrying capacity of the blood, and has an effect on the dissociation of oxyhaemoglobin, which
further reduces the oxygen supply to the tissues. CO is chemically unchanged in the body, and is eliminated in expired air. The elimination is
determined by the same factors that applied during absorption. The half-life while breathing room air is 2 h - 6,5 h depending on the initial
COHb level.
If the CO level in the inhaled air is constant, the level of COHb in the blood will approach an equilibrium (saturation) state after several hours.
However, the rate at which the equilibrium is reached depends on many factors, e.g. lung ventilation rate (physical activity) and alveolar
capillary transfer, cardiac parameters, blood haemoglobin concentration, barometric pressure, oxygen and carbon dioxide concentration in
the inhaled air, but the two most important factors in determining the COHb level are the CO concentration and the duration of exposure.
Table A – Health effects of COHb blood levels on healthy adults
% COHb
Effects
0,3 – 0,7
Normal range in non-smokers due to endogenous CO production
0,7 – 2,9
No proven physiological changes
2,9 – 4,5
Cardio-vascular changes in cardiac patients
4 – 6
Usual values observed in smokers, impairment in psychomotor tests
7 – 10
Cardio-vascular changes in non-cardiac patients (increased cardiac output and coronary blood flow)
10 – 20
Slight headache, weakness, potential burden on foetus
20 – 30
Severe headache, nausea, impairment in limb movements
30 – 40
Severe headache, irritability, confusion, impairment in visual acuity, nausea, muscular weakness, dizziness
40 – 50
Convulsions and unconsciousness
60 – 70
Coma, collapse, death
Source: U.S. Environmental Protection Agency 1984