The Association of Swiss Installers of Security Systems (SES) has established the following guidelines:
For the monitoring of toxic (poisonous) gases and oxygen, such as Ammonia NH3, Carbon Dioxide CO2, Chlorine Gas Cl2 and Bromine Br2, the following points should be observed:
Number of gas sensors
- At least two gas sensors must always be used in each room
- For monitoring a room; the maximum monitoring area per gas sensor is 60 m2
- In the case of object or area monitoring; the gas sensors must be mounted directly next to the possible gas leak point.
Installation of gas sensors
- For gases with a density lower than air, the gas sensors must be mounted on the ceiling. For example: ammonia
- For gases with a density greater than air, the gas sensors must be mounted 30 cm above the floor. For example: bromine, chlorine dioxide, bromine, etc.
- Special clarifications are required for certain gases and applications. If in doubt, please contact us.
Installation of the gas control panel
- A gas control panel should always be installed outside of the danger area.
- A gas control panel should be in an easily accessible location.
- A gas control panel for toxic gases and oxygen must be backed up by a UPS.
- The emergency power supply (UPS) for gas warning systems must ensure operation for at least 6 hours.
Servicing the gas warning system
- Gas warning systems must be put into operation by the installer.
- The gas measuring cells in the gas sensors are wearing parts and must be replaced every 1-5 years, depending on the type of gas.
- A gas warning system must be checked and calibrated by the installer at least once a year. Depending on the application, shorter intervals may be necessary.
- When servicing a gas warning system, the gas measuring cells must be replaced in accordance with the maintenance plan.
For more information, please contact the association and order their documentation: