OZONE ANALYZER BMT 964 Manual, Rev. 04/2021
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Alarm-Event is entered into the Event-Log. The display alternates between the
measurement result and the message
High Alarm!
If Alarm Beep is activated, there is also an acoustic signal, which may be stopped
using the BACK key, if the front panel menu is on its basic level. The BACK but-
ton does not clear a latched alarm, though.
If ozone concentration falls below Threshold – 0.002 x range (hysteresis) the
alarm state is ended if Latching is set to Not-Latching. The High-Alarm-Relay
falls back into its normal state, the error message and the acoustic signal disap-
pear. The end of the alarm state is entered into the Event-Log.
In case Latching is activated, the alarm will not go away until it is acknowledged
by pressing the ENTER button, even if concentration falls below the mentioned
threshold. The end of alarm will be entered into the Event-Log when the button
is pushed. Also, the button is free for initiating zeroing again.
Low-Alarm
This alarm occurs if Enable/Disable is activated and concentration is below the
limit stored under Threshold. In case Relays Open/Close is set to Relays Clos-
ing, the Low-Alarm-Relay closes (default), otherwise it opens. At the same time a
Low-Alarm-Event is entered into the Event-Log. The display alternates between
the measurement result and the message
Low Alarm!
If Alarm Beep is activated, there is also an acoustic signal, which may be stopped
using the BACK key, if the front panel menu is on its basic level. The BACK but-
ton does not clear a latched alarm, though.
If ozone concentration rises above Threshold + 0.002 x range (hysteresis) the
alarm state is ended if Latching is set to Not-Latching. The Low-Alarm-Relay
falls back into its normal state, the error message and the acoustic signal disap-
pear. The end of the alarm state is entered into the Event-Log.
In case Latching is activated, the alarm will not go away until it is acknowledged
by pressing the ENTER button, even if concentration rises above the mentioned
threshold. The end of alarm will be entered into the Event-Log when the button
is pushed. Also, the button is free for initiating zeroing again.
Relays Open/Close:
This variable decides if the alarm relays will open or close if an alarm occurs. Re-
lays Closing (default) leads to closing contacts upon reaching the alarm threshold.
This menu item influences both alarm relays at the same time.
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