OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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24
Alarms
High-Alarm
This alarm occurs if Enable/Disable is activated and the limit stored under
Threshold is exceeded. In case Relays Open/Close is set to Relays Opening, the
High-Alarm-Relay opens (default)
1
, otherwise it closes. At the same time a High-
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 button, if the front panel menu is on its basic level. The BACK
button 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 disappear. 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 programmed
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 Open-
ing, the Low-Alarm-Relay opens (default)
1
, otherwise it closes. 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 button, if the front panel menu is on its basic level. The BACK
button 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 disappear. 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 programmed
1
The default setting for the alarm behaviour has been changed starting from firmware version 1.05. For firmware
versions 1.04 and earlier the factory default setting is Relay Closing.
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