• The new detector must ignore CO levels of 30 ppm or less for at least 30 days and ingore levels of 70 ppm or less for at least an hour.
    • There are detectors available that will alarm at a lower level.
  • All detectors must have a silence button. Pushing it will silence the alarm for four to six minutes. If the concentrations stay above 70 PPM it will alarm again in six minutes. (Previously set at 100 PPM)
  • The new detectors have only two alarms, a full alarm and a trouble alarm. The second revision of UL-2034 detectors allowed (not mandated) warning alarms that sounded at low levels. Some found this confusing.
  • Detectors manufactured under the new standard should reduce the number of nuisance alarms.
  • These detectors must not alarm in the presence of the gases listed in the following table below the indicated level.
Gas
Should Not Alarm Below
Methane 500 PPM
Butane 300 PPM
Heptane 500 PPM
Ethyl Acetate 200 PPM
Isopropyl Alcohol 200 PPM
Carbon Dioxide (CO2) 5,000 PPM

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Book Updates

New Carbon Monoxide Detector Standards

UL-2034 October 1 1998

Under the new standard a CO detector must sound if CO is present for the listed time in the
following concentrations:

New Standard UL-2034 Old UL-2034
70 PPM - alarm beween 60 & 240 minutes Resist alarming at 100 PPM for 90 minutes
150 PPM - alarm beween 10 & 50 minutes Resist alarming at 200 PPM for 35 minutes
400 PPM - alarm beween 4 & 15 minutes Resist alarming at 400 PPM for 15 minutes

 

 



 

 

 

 



 

 

 



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