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Maintenance BDS 3960
Teledyne Analytical Instruments 52
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.)
Each of the concentration alarms have their own button on Main
display of the PPC application, ALARM 1 and ALARM 2. Once you
press on the alarm buttons you will be presented with alarm setup
screen.
Five parameters can be changed on the alarm setup screen:
1. Value of the alarm level—#### ppb (oxygen); value can be set
from 0 to 100,000 ppb.
2. Out-of-range direction—High or Low
3. Latch control—Latching or Non-latching.
4. On/off Control—Active or Defeated.
5. Safety Mode—Failsafe or Non-failsafe.
To reset a latched alarm, go to On/off Control and select defeated.