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Setting the Alarms (MX300 only)
HI Alarm
1. Unlock the control keys by pressing the
LOCK/UNLOCK key. The display will flash.
2. 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.
Press Lock key to save settings or proceed to
Low alarm setting below.
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.
LO Alarm:
3. Press the LO ALARM SET key once. (You may have to first unlock the keys using
LOCK/UNLOCK). Press the UP and DOWN arrow key to select a value shown in the lower
left corner. A built-in safety feature will not allow you to select a LO alarm value less than
18%. Press the Lock key to save settings.
Testing the Alarms:
4. To test the alarms, unlock the controls by pressing the LOCK/UNLOCK key and then press
ALARM TEST key. The LO alarm followed by the HI alarm will blink and the audible
visual alarm will activate for about 1 second. Press LOCK key for normal operation.
5. To silence the alarm buzzer for 115 seconds press the alarm silence key.
Power OFF
To shut off the AX/MX300:
1. Press LOCK/UNLOCK to unlock the keypad.
2. Press I/O to turn the instrument off.
1. After installing batteries the LCD will flash 00.0.
2. Thread flow diverter onto the sensor, insert into the
plastic tee as shown above. Connect to a supply of pure
dry oxygen flowing at 1-2 liters per minute.
3. After 20 seconds press CAL key. The LCD will count
down from 9 to 0. When the calibration is complete the
LCD will display the gas value.
4. Press the LOCK/UNLOCK key to save the calibration
data. The LCD will stop flashing.
5. Check the batteries by pressing the BAT TEST key.
(MX300 only)
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 exactly 20.9.
AX/MX300 Quickstart Guide Rev 4 8/28//03
P/N A76029
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