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Portable Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 31
alarm. A HI alarm activates when the oxygen concentration rises above
the setpoint. The LO alarm activates when the oxygen concentration
falls below the setpoint.
To set the alarm as either a HI or LO alarm:
1. Use the UP/DOWN keys to navigate to the HI-LO ALARM
screen. Then press ENTER to enter the setup screen.
2. Use the UP/DOWN keys to toggle between HI and LO
option. Then press ENTER to accept the displayed status.
3. Press ENTER again to save the alarm status and return to the
HI-LO ALARM screen.
3.2.9 LTCH ALARM Screen
The alarm on the Model 3110 can be set up as latching or non-
latching. A latching alarm, once triggered, will remain in alarm status
until recognized and reset. Even if the concentration changes back to a
non-alarm concentration, a latched alarm will remain in alarm status. A
non-latching alarm will cease to alarm when the concentration falls or
rises to a non-alarm value.
To set the alarm to either latching or non-latching:
1. Use the UP/DOWN keys to navigate to the LTCH ALARM
screen. Then press ENTER to enter the setup screen.
2. Use the UP/DOWN keys to toggle between LTCH and NON-
LTCH options. Then press ENTER to accept the displayed
status.
3. Press ENTER again to save the alarm status and return to the
LTCH ALARM screen.