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Old 11-12-2011, 07:11 AM   #16
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Carbon Monoxide Detector


Agree that is not good if the the time/concentration algorithm does not throw an alarm at a level that is thought to be a problem for long term exposure. But the model I have (2 of) holds the higest instantaneous reading in memory and has a button to press to read it. Checking this once in awhile gives you a good idea if you are getting even low levels of CO in your living spaces. Then of you see something there, even though way below any alarm point, you are alerted to a potential problem that should be investigated. I have tested both of mine in the range hood area and this really works.

I am going to do another test this evening by putting one of the units near my oven whilst I bake a pizza.


Anyway, maybe not perfect but I'd rather have 20/40 vision than be blind if you'll pardon the analogy.

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Old 11-12-2011, 07:56 AM   #17
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There are Co detectors that are not UL approved. They are low level detectors, and sound an alarm long before any UL approved one will. So that you can be notified before you have been exposed for hours or days.
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Old 11-12-2011, 07:58 AM   #18
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Who makes those?
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Old 11-12-2011, 09:30 AM   #19
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NSI.

Will alarm at 15 PPM.
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Old 11-12-2011, 11:21 AM   #20
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Originally Posted by raylo32 View Post
Who makes those?
Go to coexperts.com. they make non ul approved
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Old 11-12-2011, 02:23 PM   #21
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Probably would have to stop eating chili with beans. ;-)

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NSI.

Will alarm at 15 PPM.
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Old 12-05-2011, 03:41 PM   #22
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Carbon Monoxide Detector


I had the exact same problem as the OP, so I did a little digging to find out why it was not reading any CO. From what I've read and been told there are several different variables in this type of test that can cause the CO detector to fail.

1. I found out that residential CO detectors do not have moisture traps as do commercial CO testers, like the Bacharach or Testo units do. Because they don't have moisture traps, the CO sensor is being submitted to a much higher level of humidity than they were designed for and this could cause the sensor to fail outright.

2. Residential CO detectors do not have any internal pumps, again as do the commercial CO testers. This means that unless you have the CO detector in a sealed box, and are pumping CO directly into this sealed environment, there is no way to get an accurate reading - or to even know if the CO from the vehicle exhaust is even reaching the sensor. The downside to using this technique of testing on a residential alarm is that the sensors are not calibrated to handle the amount of CO being emitted from a vehicle exhaust, and this may cause the sensors to malfunction.

3. CO sensors are not designed to take the amounts of heat generated and expelled by vehicles through their exhaust. This can also cause the sensor to fail.

***I was also told that if the residential detector is tested in this manner, the warranty will automatically be void, as the unit is being subjected to an environment outside of it's intended operating environment.

It was suggested that if you want to test a residential CO detector that you get a small 5 gallon clear plastic tub (such as one of those cheap fish tanks you can buy at a pet store) and some low-smoke incense (smoke in the average incense will contain lots of chemical vapour. Too much chemical vapour may create a barrier on the sensor that prevents the chemical reaction of CO gas with the sensing element. And also, the chemical vapour will deteriate the sensor life faster in the long run). I used the Izumi Garden Spring smokeless incense in my tests. Place the detector under the upside down tank, light some incense and place it under the tank, wait for the detector to go into alarm.

I found a detector online that reads CO down to 10 ppm, Automatically displays CO above 30 ppm and goes into alarm at 40 ppm @ 86 minutes (personal test results). It is the Protech 7035-SL, I bought it at the Seaco Company. If you want a detector that will display any CO read above 9 ppm and go into alarm at 30 ppm, you should try the Protech 8505, it is their commercial monitor. I bought one for my shop, and it works quite well. Both of these units have a 5-star rating on Amazon, last I checked.

Hope I helped out and good luck.

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