Several of the current electro/mechanical CO sensors will give a false indication of CO when exposed to solvents and especially when exposed to isopropyl alcohol. If the potential for CO presence can be definitively ruled out, consider using an atmospheric monitor with no CO sensor.
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Exercise caution and contact the manufacturers vendor representative that sold you the meter. I work for an industrial fire department and we experienced a phenomenon of “cross sensitivity” with a particilar meter we purchased. We were in fact in a reasonably high Hydrogen atmosphere that indicated no LEL percentage yet high CO readings. After consulting with the manufactuer we found that the CO sensors we were using would indeed indicate the presence of CO when exposed to hydrogen. This is known as “cross sensitivity” (good question to ask when researching the purchase of new meters). We categorically trained all personnel on this issue and eventually switched to a different manufacturer more suited to our particlar facility.