Teledyne MX300 - Manual (Page 22)

Operating Instructions MX300
Teledyne Analytical Instruments 14
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 alarm may be defeated by setting the HI alarm limit one step above
100%. The HI alarm setting will display “- -” to show that it is disabled. The LO
alarm is still functional.
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%.
Figure 2-8: Setting the Alarms
Note: The MX300 Portable Oxygen Monitor is designed to prevent crossing of HI/LO
alarm settings. If you attempt to set the LO alarm higher than the HI alarm, it will
push the HI alarm setting up as you continue to rise the LO alarm set point. This al-
so applies when attempting to set the HI alarm lower than the LO alarm.
3. 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 are activated for about
1 second.
4. To silence the alarm buzzer for 115 seconds press the alarm silence key
(flashing red indicator light). Buzzer cannot be silenced when the moni-
tor registers oxygen l at falls below 18%.
5. To disable the high alarm set the high alarm set point above 100%.
Note: When HI alarm is disabled (set point above 100%) the set point is shown as two
dashes “- -’’. The LO alarm setting is not affected.