Teledyne MX300 - Manual (Page 21)

Portable Oxygen Monitor Operating Instructions
Teledyne Analytical Instruments 13
Note: At the end of the calibration countdown, the Monitor will display a solid number,
indicating acceptance of the calibration value. No further user action is re-
quired. If the LOCK/UNLOCK key is still pressed, the display will start blinking,
allowing the recalibration. If this LOCK/UNLOCK key-press is in error, either
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 Monitor reaches the locked mode, press the LOCK/UNLOCK
key and press the CAL key to repeat calibration.
Note: The MX300 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 Monitor to
assume that the gas delivered for calibration was 100% Oxygen. This latter be-
havior of the Monitor, which is common across other peer group Monitors, 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 Moni-
tor.
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 Monitor is only as good as the accuracy of calibration gases used
and the accuracy of the procedure used to calibrate the Monitor.
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. Adjust alarm set points to desired level according to the procedures in
Section 2.1.4.
9. The Monitor is now ready for use.
2.1.5 Alarms
Note: Before attempting to change the alarms it is necessary to unlock the control
keys by pressing the LOCK/UNLOCK key. When pressed the display will start
flashing.
To set the alarms on the MX300 Monitor (see Figure 2-8):