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Carbon monoxide false alarm

  • 22-07-2014 7:50pm
    #1
    Moggaman
    Registered Users Posts: 350 ✭✭


    I came home today and the carbon monoxide alarm was goin off saying 200ppm. Nobody at home all day. No stove on for the last 2 month. No gas hob on. A window left open and all. Open doors alarm stops. Checked the alarms battery..Its ok...am I right in sayin it couldn't possibly be carbon monoxide. Alarm about 6 yrs old and it's a detached rural house


Comments

  • #2
    Steven81
    Registered Users Posts: 1,249 ✭✭✭Steven81


    If you can move the alarm outside do and see what reading you get. Bring it in then if it reads zero and recheck.


  • #3
    Steven81
    Registered Users Posts: 1,249 ✭✭✭Steven81


    Concentration Symptoms
    35 ppm (0.0035%) Headache and dizziness within six to eight hours of constant exposure
    100 ppm (0.01%) Slight headache in two to three hours
    200 ppm (0.02%) Slight headache within two to three hours; loss of judgment
    400 ppm (0.04%) Frontal headache within one to two hours
    800 ppm (0.08%) Dizziness, nausea, and convulsions within 45 min; insensible within 2 hours
    1,600 ppm (0.16%) Headache, tachycardia, dizziness, and nausea within 20 min; death in less than 2 hours
    3,200 ppm (0.32%) Headache, dizziness and nausea in five to ten minutes. Death within 30 minutes.
    6,400 ppm (0.64%) Headache and dizziness in one to two minutes. Convulsions, respiratory arrest, and death in less than 20 minutes.
    12,800 ppm (1.28%) Unconsciousness after 2–3 breaths. Death in less than three minutes.


  • #4
    Robbie.G
    Registered Users, Registered Users 2 Posts: 1,884 ✭✭✭Robbie.G


    Moggaman wrote: »
    I came home today and the carbon monoxide alarm was goin off saying 200ppm. Nobody at home all day. No stove on for the last 2 month. No gas hob on. A window left open and all. Open doors alarm stops. Checked the alarms battery..Its ok...am I right in sayin it couldn't possibly be carbon monoxide. Alarm about 6 yrs old and it's a detached rural house
    Most co alarms have a life span of 6-7 years and some of the more expensive models have a lifespan of 10 years but need the sensor replaced at 5 years.
    Check the side of alarm and it will state when it needs replacing.


  • #5
    Call me Al
    Registered Users Posts: 3,029 ✭✭✭Call me Al


    Our alarm went off when my partner and I were sitting in the room last month. There was no fire or heating on, and it had been installed exactly as per guidelines, so we were confused.
    After a while I realised that the lamp next to it was switched on. There was a small bit of dust on the bulb that started to "burn" after an extended period and the "fumes" set it off. We wiped down the bulb, aired the room, and it stopped.

    These alarms can be extremely sensitive so be very thorough when you're checking for a source.


  • #6
    Lex Luthor
    Registered Users, Registered Users 2 Posts: 11,220 ✭✭✭✭Lex Luthor


    as already mentioned, domestic CO detectors have an operational life of approx 6yrs so you would be advised to replace your detector

    one of the most common gases that is cross sensitive to Carbon Monoxide is Hydrogen. Low levels of Hydrogen can give very high readings (>200ppm) of CO.

    Where a source of Hydrogen in a house could trigger this I'm not sure, but if the batteries in the unit are possibly old and maybe leaking, I could be mistaken to think that some of the gas they emit when they leak is Hydrogen. I stand to be corrected on this

    However, you did the right thing when your alarm went off, next step is get yourself a new unit


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