Nighthawk Detectors at Tuesday Morning

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Greyhound
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Post by Greyhound » Sun. Apr. 06, 2008 12:20 am

If you have a Tuesday Morning store near you, I saw the Nighthawk digital readout type Carbon Monoxide detectors in there today at $19.99. That's the best price I have seen on these units.

 
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coal berner
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Post by coal berner » Sun. Apr. 06, 2008 12:44 am

Hi Greyhound That is a great price I paid 44.00 For mine I never Heard of that store Would you Pick me up two I could take a Sunday ride up to you and pick them :)

 
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Devil505
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Post by Devil505 » Sun. Apr. 06, 2008 8:01 am

Anyone know how long these detectors are good for? (If & when they should be replaced due to age)


 
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gaw
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Post by gaw » Sun. Apr. 06, 2008 8:51 am

If I remember correctly they should be replaced at 5 years. I installed a new one in the basement this year and I think the instructions said it would intentionally quit at 7 years. I don't know if they start to beep at that age or how you will know but I'm sure it said they were designed to quit after 7 years or so. I have an older one still plugged in that must be about 8 years old and should replace it any day now. You know what they say about good intentions.

 
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Post by Yanche » Sun. Apr. 06, 2008 7:11 pm

All CO detectors have limited lifetimes. The limited lifetime of CO detectors occurs because the sensor that responds to CO gases is an electrochemical cell with an electrolyte that degrades with time. An analogy would be a dry cell battery, as the electrolyte evaporates over time the battery is useless. Consumer grade CO detectors have claimed lifetimes in the order of 5 years. BUT, like with all consumer marketed items it's an somewhat exaggerated claim. When you look at the electrochemical sensor manufacturers lifetimes claims they are less than 5 years. The much more expensive CO detectors used by fire departments have lifetimes of 2 years or less depending on use.

When you purchase a CO detector you should determine the manufacture date of the specific unit you are purchasing. Open the box and find the date code in the store before you buy it. When you install the unit mark it with the installation date and a NFG date. I'd suggest 5 years or less from the manufacture date.

There are improved CO sensors, known as three electrode sensors, that use additional the electrode and compensating electronics to improve measurement accuracy and lifetime. CO detectors with these sensors cost considerable more (double) and are difficult to find in retail stores. I'm currently trying to identify a manufacturer and model.

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