Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 20)

Operation AD300/MD300
Teledyne Analytical Instruments 20
Figure 2-8: Setting the Alarms (MD300)
8. (MD300 only) Adjust alarm set points to desired level
according to the procedures in Section 2.1.5.
9. Press the LOCK/UNLOCK key to hold settings. The unit is
now ready for use.
2.1.5 Alarms (MD300 only)
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 MD300 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. Press
lock key or proceed to LO alarm settings
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%. Press LOCL key to save settings.
Note: The MD300 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 also 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).