Effects of Other Gases
The Check O2 Plus is designed to measure two different types of gas mixtures:
•Oxygen, nitrogen and argon from oxygen concentrators
•Pure oxygen during calibration verification mode
Any other concentrations or combinations of gases will cause the Check O2 Plus to measure oxygen concentration incorrectly.
Operating Instructions
Effects of Low Flow
Oxygen concentrators function on the principle of removing nitrogen gas from air, leaving concentrated oxygen and argon at a specific oxygen to argon ratio. This operating principle may be altered when concentrators are set to flow at the low end of their operational range. At low flows they may output a low oxygen concentration, e.g. 85% to 91%, for reasons other than high nitrogen, possibly due to an increase in argon content. The Check O2 Plus requires that the ratio of oxygen to argon remain constant in order to guarantee an accuracy of
•DO NOT use the Check O2 Plus to measure the oxygen concentration of a concentrator when flowing at rates lower than its optimal performance as specified by the concentrator manufacturer; generally 4 LPM or less on concentrators that have a maximum flow of 10 LPM, and 1 LPM or less on concentrators that have a maximum flow of 5 LPM.
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