The European standard EN50291
On February 15th 2001 Europe approved a standard for domestic CO alarms. Summary of the new European standard EN 50291 on domestic CO alarms. Electrical apparatus for the detection of carbon monoxide in domestic premises - test methods and performance requirements.
This standard requires that the triggering of the alarm should occur:
- Not before 120 minutes for a concentration of 30ppm,
- Between 60 and 90 minutes at a concentration of 50 ppm,
- Between 10 and 40 minutes at a concentration of 100 ppm,
- Before 3 minutes at a concentration of 300 ppm,
These values make the European CO alarms much safer than CO alarms in accordance with the American UL 2034 or English CO alarms in accordance with the BSI who disappeared from the market in April 2006.