(2) Where the CO detector indicates a reading between 30 ppm and 70 ppm 1. The inspector should immediately notify the occupant of the need for themselves and any building occupant to evacuate the inspector shall immediately evacuate and call 911. Based on CGD and CO detector readings, the inspector should take the following actions: (1) The CO detector indicates a carbon monoxide level of 70 ppm or greater 1. Immediately upon entering the building, a sample of the ambient atmosphere should be taken. Prior to entering a building, the inspector should have both a combustible gas detector (CGD) and CO detector turned on, calibrated, and operating. Where a CO detector is used without an air free conversion function, the CO air free can be calculated in accordance with footnote 3 in Table D.6. Air Free: Capable of converting CO measurements to an air free level in ppm. Alarm: A sound alarm function where hazardous levels of ambient CO is found (see D.2 for alarm levels).PPM: For measuring ambient room and appliance emissions a display scale in parts per million (ppm) from 0 to 1,000 ppm in 1 ppm increments.(2) CO Detector: The CO detector should be capable of the following functions and have a numeric display scale as follows: Audio: An audio sound feature to locate leaks.LEL: Numeric display with a percent lower explosive limit (% LEL) scale from 0 percent to 100 percent in 1 percent increments.PPM: Numeric display with a parts per million (ppm) scale from 1ppm to 900 ppm in 1 ppm increments.The combustible gas detector should be capable of the following: (1) Gas Detector : The CGD should be capable of indicating the presence of the type of fuel gas for which it is to be used (e.g. In addition, it is recommended that the detectors have the following minimum specifications. Prior to any inspection, the detectors should be calibrated or tested in accordance with the manufacturer's instructions. It is recommended that both types of detectors be listed. The inspection procedures include measuring for fuel gas and carbon monoxide (CO) and will require the use of a combustible gas detector (CGD) and a CO detector.
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