Teledyne BDS-3960 operating instructions Maintenance

Maintenance BDS 3960

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.

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