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• If you are unsure about the displayed O
2
percentage.
(see Factors influencing accurate readings.)
A simple calibration may be made with the sensor open to static Ambient air. For
optimum accuracy Maxtec
®
recommends that the Sensor be placed in a closed
loop circuit where gas flow is moving across the sensor in a controlled manner.
2.2.1 In Line Calibration (Flow Diverter – Tee Adapter)
1. Attach the diverter to the MAXO
2
®
+
by threading it on to the bottom of the sensor.
2. Insert the MAXO
2
®
+
in the center position of the tee adapter. (figure 2, A)
3. Attach an open-ended reservoir to the end of the tee adapter. Then start
the calibration flow of oxygen at two liters per minute.
Six to 10 inches of corrugated tubing works well as a reservoir. A calibra-
tion oxygen flow to the
MAXO
2
®
+
of two liters per minute is recommended
to minimize the possibility of obtaining a "false" calibration value.
4. Allow the oxygen to saturate the sensor. Although a stable value is usually
observed within 30 seconds, allow at least two minutes to ensure that the
sensor is completely saturated with the calibration gas.
5. If the MAXO
2
®
+
is not already turned on, do so now by pressing the
analyzer
“ON” button.
6. Press the Cal button on the MAXO
2
®
+
until you read the word CAL on the
analyzer display. This can take approximately 3 seconds. The analyzer will
now look for a stable sensor signal and a good reading. When obtained,
the analyzer will display the calibration gas on the LCD.
NOTE: Analyzer will read “Cal Err St” if the sample gas has not stablized.
2.2.2 Direct Flow Calibration (Barb)
1. Attach the Barbed Adapter to the MAXO
2
®
+
by threading it on to the
bottom of the sensor.
2. Connect the Tygon tube to the barbed adapter. (figure 2, B)
3. Attach the other end of the clear sampling tube to a source of oxygen with
a known oxygen concentration value. Initiate flow of the calibration gas to
the unit. Two liters per minute is recommended.
5
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4
MANUFACTURED BY MAXTEC, INC.
2.1.3 Automatic Calibration
After the unit is turned on it will automatically calibrate to room air. The
display should be stable and reading 20.9%.
To check the oxygen concentration of a sample gas:
(after the unit has been calibrated)
1. Connect the Tygon tubing to the bottom of the
analyzer by threading the barbed adapter onto
the oxygen sensor. (figure 2, B)
2. Attach the other end of the sample hose to
the sample gas source and initiate flow of the
sample to the unit at a rate of 1-10 liters per
minute (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.
2.2 Calibrating the MAXO2
®
+ Oxygen Analyzer
NOTE: We recommend use of medical grade oxygen at 100% when calibrating the MAXO
2
®
+
.
The MAXO
2
®
+
Analyzer should be calibrated upon initial power-up. Thereafter,
Maxtec
®
recommends calibration on a weekly basis. To serve as a reminder, a
one week timer is started with each new calibration. At the end of one week a
reminder icon “ ” will appear on the bottom of the LCD. Calibration is recom-
mended if the user is unsure when the last calibration procedure was performed,
or if the measurement value is in question.
For hospital and home care a new calibration is required when
• The measured O
2
percentage in 100% O
2
is below 97.0% O
2
• The measured O
2
percentage in 100% O
2
is above 103.0% O
2
• The CAL reminder Icon is blinking at the bottom of the LCD
• If you are unsure about the displayed O
2
percentage. (see Factors
influencing accurate readings.)
For ID testing, (or optimum accuracy) a new calibration is required when
• The measured O
2
percentage in 100% O
2
is below 99.0% O
2
• The measured O
2
percentage in 100% O
2
is above 101.0% O
2
• The CAL reminder Icon is blinking at the bottom of the LCD
FIGURE 2
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