Maxtec MaxO2 OM-25A - Calibrating the MAXO Analyzer; Before You Begin; To Calibrate the MAXO Analyzer

866.4.Maxtec www.maxtecinc.com 3
3. Slide the battery compartment cover back onto the case. Make sure the
tabs on the cover snap into position, securing the cover ush against the
case.
When batteries are installed in the MAXO
2
®
analyzer, the unit initiates a
self-diagnostic test. All segments of the LCD readout are turned on for
approximately 2 seconds. When the diagnostic test is completed
successfully, the word "CAL" will appear on the display, indicating that the
unit is ready to be calibrated.
2.2 Calibrating the MAXO
2
®
Analyzer
2.2.1 Before You Begin
The
MAXO
2
®
Oxygen Analyzer should be calibrated upon receipt.
Thereafter, Maxtec recommends calibration on a weekly basis. However,
more frequent calibration will not adversely affect product performance.
More frequent calibration is required when:
»
The temperature of the gas stream changes by more than 3 degrees
Celsius.
»
Changes in elevation result in calibration error of approximately 1% of
reading per 250 feet. In general calibration of the instrument should be
performed when the geographic elevation at which the product is being
used changes by more than 500 feet.
In addition, calibration is recommended if the user is unsure when the
last calibration procedure was performed or if the measurement value
displayed is in question.
It is best to calibrate the MAXO
2
®
analyzer to a known documented
oxygen concentration at a pressure and ow 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 dened
as an oxygen source which has a traceable certicate and / or USP
certication.
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 Inuencing Calibration”, section 2.2.4 in this manual.
2.2.2 To Calibrate the MAXO
2
®
Analyzer
1. Connect the sample hose to the barbed tting 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 ow of the calibration