Carbon Monoxide Monitors Maintenance
Posted on Dec 10, 2014
Note that in the NFPA 99, 2012 22.214.171.124.7 there is a requirement that the CO monitor be calibrated at least annually and maintained according to the manufacturer recommendations. There is a very good reason for this. It is typical of many CO monitor sensors to fail to the ZERO PPM reading. Therefore, if it is simply observed and the reading is always Zero, you don’t know if the ppm is truly zero or if the monitor is not working. Also note that the manufacturer does have a replacement frequency recommendation for the sensor. It is typically two years, but varies by manufacturer.