OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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Caution: Do not remove the host adapter before being prompted to do so! Do not cut power to
the instrument during the upgrade process!
10 Error Handling and Early Warnings
The BMT 965 has diverse possibilities to recognize errors, to signal them and to early-warn against
them. Errors and Early Warnings are displayed on the front panel. Depending on the importance
of the error, the Error Relay (pins 1 and 3) as well as the Early Warning contacts Lamp Low (Pin 9)
or Cuvette Dirty (Pin 14) are activated (opened). Errors and Early Warnings are always accompa-
nied by an acoustic signal. In case the menu on the front panel is on its basic level, the BACK
button may be used to stop the beeper.
During warmup the Error Relay is in the error position (open).
Errors and Early Warnings are also sent out over the serial interface (s. p. 13) and are documented
in the Error-Log on the SD card. The actual status can be read out in Link-Mode with the com-
mand *86#.
The following conditions will lead to warnings respectively errors:
Lamp Low Warning
This warning usually will occur before a Lamp Low Error. The message
Warning:Lamp Low
is shown alternating between the measurement results. The error contact Lamp Low opens, but
the Error Relay stays in its normal state. A Lamp Low Warning should be a hint to the user, that
due to aging the UV lamp has become weaker and that at the next opportunity it should be replaced
by a new one. Measurement accuracy is not impaired in this state.
Lamp Low Error
Additionally the Error Relay indicates Error. The message
Error: Lamp Low
is displayed between measurement results. Accuracy can be impaired in this state.
Lamp Off Error
The UV lamp does not work anymore. The message
Error: Lamp Off
is shown constantly. Both analog outputs are set to their max. values (10 V respectively 20 mA),
because the instrument is not able to acquire concentration data without a lamp. Lamp Low contact
and Error Relay indicate error.
A possible cause is low temperatures of 15 °C and below during powering up. In this case wait
(max. 4 minutes) or switch the analyser off, then on again.
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