Teledyne 3000MA - Paramagnetic oxygen analyzer - Manual (Page 43)

Percent Oxygen Analyzer Operation 4
4-13 Teledyne Analytical Instruments
In failsafe mode, the alarm relay de-energizes in an alarm
condition. For non-failsafe operation, the relay is energized in an
alarm condition. You can set either or both of the concentration
alarms to operate in failsafe or non-failsafe mode.
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 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
4.3.3 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
AL–1 is blinking.
AL—1 AL—2
Choose Alarm
Set up alarm 1 by moving the blinking over to
AL–1 using the < >
arrow keys. Then press Enter to move to the next screen.
AL—1 1.00 % HI
Dft—N Fs—N Ltch—N
Five parameters can be changed on this screen:
• Value of the alarm setpoint, AL–1 #### % (oxygen)
• Out-of-range direction, HI or LO
• Defeated? Dft–Y/N (Yes/No)
• Failsafe? Fs–Y/N (Yes/No)
• Latching? Ltch–Y/N (Yes/No).