Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 50)

4 Operation Model 3020M
4-14 Teledyne Analytical Instruments
• One high and one low alarm, or
• Both low (low and low-low) alarms.
2. Are either or both of the alarms to be configured as failsafe?
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 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 4.4
to enter your password. Once you have clearance to proceed, ENTER the
ALARM function.
AL—1 AL—2
Choose Alarm
Use the DOWN/UP
control to blink your choice of alarm, AL-1 or
AL-2. Then 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? (Yes/No): Dft–Y/N
• Failsafe? (Yes/No): Fs–Y/N
• Latching? (Yes/No): Ltch–Y/N.
• To define the setpoint, use ENTER to blink AL–1 ####, if not
already blinking. Then use the DOWN/UP control to change the