A CO meter is a handheld instrument that measures carbon monoxide concentration in air, typically displaying readings in parts per million (ppm). These devices use electrochemical sensors to detect CO from heating systems, combustion appliances, or environmental sources. Response times range from 10-30 seconds depending on sensor type.
Technical Details
CO meters feature ranges of 0-1,000 ppm or 0-4,000 ppm, with accuracy ratings of ±10-15% of full scale. Electrochemical sensors provide reliable long-term stability and lower cost compared to infrared alternatives. Most units include audible and visual alarms when levels exceed configurable thresholds, typically 35 ppm for 8-hour exposure per OSHA standards.
HVAC Applications
HVAC technicians use CO meters to evaluate furnace venting integrity, combustion efficiency, and flue draft quality. Testing occurs at registers, return air pathways, and exhaust outlets to confirm safe operation and detect backdrafting conditions.
Practical Significance
CO meter testing provides critical safety assurance for homeowners, identifying life-threatening leaks before they cause poisoning. Regular measurements during maintenance visits establish baseline conditions and track system performance over time.