CO Dangers, Dr. D. Penney



CO Dangers

UL / CPSC Standards for CO Alarms:

UL 2034, April 30, 1992:

CO Concentration (ppm)
Time until Alarm Sounds
15
8 hrs.
100
90 min.
200
35 min.
400
15 min.


UL 2034, October, 1995:

CO Concentration (ppm)
Time until Alarm Sounds
15
30 days
100
90 min. (for 6 min. reset button)
200
35 min.
400
15 min.


UL 2034, October 1, 1998:

CO Concentration (ppm)
Time until Alarm Sounds
15
30 days
70
189 min. (minimum 60 min.)
150
50 min. (minimum 10 min.)
400
15 min. (minimum 4 min.)


Minimum Allowable Interferences:

Substance
Concentration (ppm)
Methane
500
Butane
300
Heptane
500
Ethylacetate
200
Isopropyl Alcohol
200
Carbon Dioxide*
1000

* For the UL 2034, October 1, 1998, Minimum Allowable Interference for CO2 is 5000 ppm.


Question - Is the current standard for CO alarms adequate? .... What do you think?

Beware of Plots of CO Effects vs. CO Conc. that are supplied with some CO alarms. Some err in not warning of the health effects at low CO conc's, others err in making CO appear more deadly than it readly is, while some do both. Others simply show grossly inaccurate rates of uptake of CO in the average human.

UL = Underwriters Laboratory; CPSC = Consumer Product Safety Commission


...... last changed 03/19/01


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