I have a nighthawk carbon monoxide detector, I have no idea what those digital numbers are for?

Question:I was cooking in the kitchen today and I notice the number got up to 9 but the alarm did not go off. I just want to know about these numbers, I have no idea how far the numbers go. I thank you for your help.

Answers:
If you can't find the manual, try looking up your model on the internet. The numbers *may* indicate parts per million of CO detected. It takes 1000ppm to cause unconsciousness in an hour, so 9ppm isn't good, but it is considered "normal" background CO.

Take a look at http://www.nfpa.org/itemdetail.asp?categ... for additional information.