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How do I know if my co2 detector is working?

co2 breath

A customer called us recently from inside their indoor greenhouse in Colorado. They had just installed a CO2 detector (carbon dioxide, not carbon monoxide there's a difference) hooked up to an alarm. Their question was very simple:

"How do I know if the CO2 monitor and alarm is working?"

Fortunately, the answer is simple: take a deep breath, hold it for a moment, then blow it directly into the meter's air vents. Repeat this several times.

Exhaled breath is approximately 4% (40,000ppm) carbon dioxide which is enough to activate any CO2 detector, CO2 monitor or CO2 safety alarm.

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