How to Calibrate Flue Gas Analyser

Calibration of your analyser is essential. It ensures that your meter’s accuracy is maintained and you’re still working to all applicable standards. Flue gas analyser and boiler testers generally measure oxygen, carbon dioxide, carbon monoxide and temperature but may also be fitted with sensors to measure additional parameters. Every gas measuring instrument requires a method for calibration or verification and there are several means for calibrating a CO2 analyzer. The easiest way is a gas calibration: pure CO2 gas at a known pressure is injected on the sensor membrane. This is a perfect method if the unknown sample is a gas. However, if the analyzed sample is a liquid, a slight deviation from the actual value can be noticed. In practice, the CO2 measurements in liquid will indicate 1 or 2 % lower CO2 level than expected after a gas phase calibration. One way to prevent this problem is to calibrate in the liquid phase. Using Orbisphere CO2 calibration kits is one way to do that. The aim of this kit is to provide the end user with an accurate and easy-to-use liquid calibration method. A known and precise amount of sodium bicarbonate powder is combined in a precise PET bottle, with a ready-made dilute citric acid solution to provide defined, accurate carbon dioxide content in the liquid. During the calibration procedure, this solution can then be circulated through...

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