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It is best to calibrate the MAXO2 analyzer to a known documented
oxygen concentration at a pressure and flow similar to your clinical
application. Calibrating the MAXO
2
analyzer at lower concentrations with
a known oxygen value is also acceptable and may provide additional
accuracy if the calibration gas is closer to the environment in which the
MAXO
2 analyzer will be used. A “known” value of oxygen is defined as
an oxygen source which has a traceable certificate and / or USP
certification.
Note: Before beginning calibration the MAX-250 sensor must be in
thermal equilibrium. You may also need to be aware of other factors
which affect device calibration values. For more information, refer to
“Factors Influencing Calibration”, section 2.2.4 in this manual.
2.2.2 To Calibrate the MAXO2 Analyzer
1) Connect the sample hose to the barbed fitting on the bottom of the
unit.
2) Attach the other end of the sample hose to the source of the known
oxygen concentration and initiate flow of the calibration gas to the unit
(2 liters per minute is recommended).
3) Using the ON/OFF key, make sure the unit is in the power on mode.
4) Allow the oxygen reading to stabilize. This will normally take about
30 seconds or more.
5) Press the LOCK/UNLOCK key to unlock the keypad. “UL” will
appear on the display for about 1 second and then the "%" sign will
disappear from the display.
6) Press the CALIBRATE key on the keypad. The word "CAL" will
appear on the display for about 1 second and then the "%" sign will
start to flash.
7) Use the ↑ and ↓ arrow keys to adjust the displayed oxygen
concentration to the level of the known concentration. Pressing the
arrow keys changes the value in .1% increments. If the keys are held
down for more than 1 second the display will scroll at a rate of .4%
per second.
Note: If 10 seconds elapse between key actuations, the system will
store the latest calibration value and will revert to normal operation.
If this occurs inadvertently, simply repeat the calibration procedure.
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