Answer
Aug 01, 2024 - 04:30 PM
Most likely if your CO sensor is showing 4 ppm on startup it may require a Zeroing in fresh air. If you're in an environment and it goes up to 4ppm I wouldn't worry, but I'd be aware that there's a small amount of Carbon Monoxide present in the room. This can also come as a cross interference from things like alcohol, so make sure you haven't used any hand sanitizer near the detector.
For danger levels, I usually consult NIOSH for information. Here's a great link to find more:
https://www.cdc.gov/niosh/topics/co-c...
For the specific info you're asking (permissible exposure limits and at what concentrations you should be worried) check the NIOSH chemical webbook:
https://www.cdc.gov/niosh/npg/npgd010...
You'll see that the TWA (average you see over an 8 hour shift) should not exceed 35ppm continuously for 8 hours.
Hope that helps!
For danger levels, I usually consult NIOSH for information. Here's a great link to find more:
https://www.cdc.gov/niosh/topics/co-c...
For the specific info you're asking (permissible exposure limits and at what concentrations you should be worried) check the NIOSH chemical webbook:
https://www.cdc.gov/niosh/npg/npgd010...
You'll see that the TWA (average you see over an 8 hour shift) should not exceed 35ppm continuously for 8 hours.
Hope that helps!
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