UL testing of CO alarms not up to EN Standards

Any CO detector installed is a potentially life saving piece of equipment, and for this reason must be carefully chosen. CO detectors with certification in accordance to the European Norm EN50291 are tested to a higher standard of sensitivity and reaction time, than those tested to the US American UL2034 standard. CO detectors that meet the strict European EN standards have met the highest safety and quality requirements. UL marks are achieved through a similar, yet less rigorous testing in the USA and it has been known for UL tested carbon monoxide detectors to fail to meet the EN standards.

Here a comparison of some of the requirements:

Test EN50291 Standard UL2034 Standard
Humidity Tested 20% to 80% relative humidity Tested 30% to 70% relative humidity
Temperature Threshold 13 to 27 degree Celsius 20 to 26 degree Celsius
Alarm Threshold 30ppm: alarm must not sound before 120 minutes 30ppm: alarm must not sound before 30 days
50ppm: alarm must sound after 60 minutes and before 90 minutes 70ppm: alarm must sound after 60 minutes and before 240 minutes
100ppm: alarm must sound after 10 minutes and before 40 minutes 150ppm: alarm must sound after 10 minutes and before 50 minutes
300ppm: alarm must sound within 3 minutes 400ppm: alarm must sound after 4 minutes and before 15 minutes
Continuous Testing 2 samples tested by certification body annually No further testing
EMC Tests Tested from 30 to 1000Mhz Tested at a few discrete frequencies

When purchasing a CO detector (or any alarm / detector) it is advisable to always check for the type of certification that has been awarded. Please browse our full range of Kitemarked marked CO detectors.

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