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Operation MX300
Teledyne Analytical Instruments 22
Figure 2-8: Setting the Alarms
calibration. Air calibration should only be used for
monitoring oxygen levels between 21% and 40% and
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 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