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Operation MX300-I
Teledyne Analytical Instruments 22
Figure 2-8: Setting the Alarms
should never be used where a high degree of accuracy
is needed.
Note: Never calibrate the unit in humidified gas, as water vapor
makes the oxygen concentration appear lower than it really
is. See Appendix: Humidity.
CAUTION: DO NOT ADJUST THE CALIBRATION SETTINGS IN
AIR AFTER THE 100% CALIBRATION, AS THIS WILL
CANCEL THE MORE ACCURATE 100%
CALIBRATION. THE 100% CALIBRATION MAY BE
REPEATED AS MANY TIMES AS DESIRED.
8. Adjust alarm set points to desired level according to the
procedures in Section 2.1.4.
9. Press the LOCK/UNLOCK key to hold settings. The unit is
now ready for use.
2.1.4 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-I monitor (see Figure 2-8):
1. To set the HI alarm: Press the HI ALARM SET
key once. Press the UP and DOWN arrow key
until the desired value is displayed in the lower
right corner of the display.
Note: The HI and LO alarms may be defeated by
setting the HI alarm limit one step above
100%. The display will blink ALARM OFF
continually in this mode.
2. To set the LO alarm, press the LO ALARM SET
key once. Press the UP and DOWN arrow key to
select a value. A built-in safety feature will not
allow you to select a LO alarm value less than
18%.
Note: The MX300-I Portable Oxygen Monitor is