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G 221 - RGS 128-228 Eng. 25.11.08 MZ REV. 01
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COSTER
13. WARNING: IN THE EVENT OF ALARM
Combustible gas (Methane, LPG-Propane)
First of all, remember that most people are able to notice the presence of combustible gases (methane and LPG-
propane) in the air, even at concentrations below the alarm level established for the detector, and so the smell of gas
does not indicate that the detector is faulty and does not necessarily indicate a danger situation.
CO–Carbon monoxide
CO (carbon monoxide) is produced by the incomplete combustion of any burner that has to use the oxygen in the
air in the space in which it is installed. It is absolutely odourless and so it is impossible to detect its presence:
this renders it extremely dangerous.
Only a gas detector can reveal the presence of this gas.
For the above reasons, and since you cannot know instinctively which type of gas has caused a dangerous situation,
if the detector signals the alarm, act as follows:
– turn off all open flames, and put out cigarettes, cigars, pipes, etc;
– turn off all gas appliances;
– do not operate electric switches since these could cause sparks;
– do not use the telephone in the spaces where gas is present;
– for methane, close the central valve of the gas supply; whilst for propane-LPG close the cylinder or the storage tank.
– open windows and doors to ventilate the spaces concerned with the presence of gas.
If the cause of the alarm is discovered and securely eliminated, the detector can be re-set and the supply of gas
re-started.
If the reason for the escape of a combustible gas if not clear, immediately inform the emergency service of the gas
supply company.
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