Teledyne 2120XL, Operating Instructions Manual, Page: 73 / 85

Trace Nitrogen in Argon Analyzer Operation
Teledyne Analytical Instruments 61
3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will
remain in the alarm mode even if process conditions revert
back to non-alarm conditions. This mode requires an alarm to
be recognized before it can be reset. In the non-latching
mode, the alarm status will terminate when process
conditions revert to non- alarm conditions.
4. Are either of the alarms to be defeated?
The defeat alarm mode is incorporated into the alarm circuit
so that maintenance can be performed under conditions
which would normally activate the alarms.
The defeat function can also be used to reset a latched alarm.
(See procedures, below.)
If you are using password protection, you will need to enter your
password to access the alarm functions. Follow the instructions in
Section 4.5.1.3 to enter your password. Once you have clearance to
proceed, enter the Alarm function.
Press the ALARM button on the front panel to enter the Alarm
function. Make sure that
AL1
is blinking.
Sel Alarm to set
AL1 AL2
Set up alarm 1 by moving the blinking over to AL1 using the
◄► arrow keys. Then press ENTER to move to the next screen.
AL—100.0
pp
m High
Dft—Y Fs—N Ltch—N
Five parameters can be changed on this screen:

Value of the alarm setpoint, AL–1 #### ppb/ppm (nitrogen)

Out-of-range direction, HI or LO

Defeated? Dft– Y/N (Yes/No)

Failsafe? Fs– Y/N (Yes/No)