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Operating Instructions
Effects of Other Gases
The Check O
2
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 O
2
Plus to measure oxygen concentration incorrectly.
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 O
2
Plus requires that
the ratio of oxygen to argon remain constant in order to guarantee
an accuracy of +/-1.5% oxygen.
• DO NOT use the Check O
2
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.
1176119-A
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