Teledyne AX300 - Medical application oxygen analyzer - Manual (Page 20)

Operating Instructions AX300
Teledyne Analytical Instruments
12
press the key once more or allow the software to revert to the locked mode au-
tomatically, which will occur within nine seconds of not pressing any functional
keys. Once the analyzer reaches the locked mode, press the LOCK/UNLOCK
key and press the CAL key to repeat calibration.
Note: The AX300 can only be calibrated using certified medical grade 100% oxygen or
ambient level air (20.9% Oxygen). Improper calibration or use of other gas con-
centrations will either activate the

SENSOR indicator or render the analyzer to
assume that the gas delivered for calibration was 100% Oxygen. This latter be-
havior of the analyzer, which is common across other peer group analyzers,
would introduce significant error in analysis. Hence, use only certified medical
grade 100% Oxygen gas or ambient level air (20.9% Oxygen) to calibrate your
analyzer.
6. Remove the sensor from the oxygen supply and confirm the LCD
reads less than 22% in room air. It is not necessary for it to read ex-
actly 20.9%.
7. It is important to perform the calibration carefully and thoroughly, us-
ing calibration gases that are free from contaminates. The accuracy of
the analyzer is only as good as the accuracy of calibration gases used
and the accuracy of the procedure used to calibrate the analyzer.
Note: A single point air calibration is not recommended unless the sensor can be ex-
posed to a known source of fresh outdoor air. Hospital room air may often have
oxygen at above normal ambient levels of 20.9%, which will introduce errors in
the calibration. Air calibration should only be used for analyzing oxygen levels
between 21% and 40% and should never be used where a high degree of accu-
racy is needed.
Note: Never calibrate the unit in humidified gas, as water vapor makes the oxygen
concentration appear lower than it really is. See Section 2.3.1: Humidity.
8. The analyzer is now ready for use.
2.1.5 Output 0-1 VDC or RS232
The AX300 Portable Oxygen Analyzer comes with optional 0-1 VDC and
RS232 signal outputs for use with compatible external recording, indicating or
computing equipment.
An optional 0-1 VDC Interface Cable (P/N B-75554) is available from Te-
ledyne for accessing the voltage output.
To connect the analyzer to an analog recording/indicating device:
1. Insert one end of the interface cable into the output port on the side of
the analyzer. See Figure 2-8.
2. Insert the other end into the analog recorder/indicator device
equipped to handle a 0-1 VDC signal.