OZONE MONITOR BMT 932 Manual, Rev. 02/2021
35
Overrange
Ozone concentration is above the range of the instrument. An alternating display of
Error: Overrange on
Channel X Y Z
and ozone concentration range is shown. The Error Relay is set to error. The analog outputs are
on their maximum values the last meaurement result led to an overrange.
EEPROMError
This error shows that there is something wrong with the internal non-volatile memory. Since this
memory stores important calibration data, the instrument should be thoroughly checked by BMT
MESSTECHNIK (s. also Chapter Trouble). The Error Relay indicates an error.
Low Flow Error
The BMT 932 has an internal sample gas flow meter, which is constantly checking the sample gas
flow rate. This flow meter is also used by the internal pump controller, which makes sure that the
flow rate is always 1 l/min. If e.g. the sample tube is clogged or the pump is faulty, the Low Flow
Error will occur, as soon as the flow rate drops below 0.8 l/min. The display shows
Error: Low Flow on
Channel X Y Z
indicating the channels with low flow. The Error Relay will be in its error postion. Measurement
results will be inaccurate (low).
17 Event- and Error-Log
These two logs are stored by the BMT 932 and document important events and errors. The last
103 events and the last 16 errors are stored, which means that the oldest entries are overwritten
when new entries are stored. Both logs are read out via the serial interface. For this purpose the
software BMT 932 LINK or the Link-Mode command *49# respectively *50# can be used.
Each entry in these logs has a time stamp, which means that date and time are recorded with a
resolution of 1s. The user is responsible for setting the internal clock. Life expectancy of the bat-
tery is 10 years or more. An empty battery will only result in erroneous time stamps in the logs.
The Error-Log documents all errors de-
scribed in chapter Error Handling with date
and time. The picture is a view of the Er-
ror-Log in the software BMT 932 LINK.
The Event-Log documents the following events and additional data:
Switching on of the BMT 932, cuvette pressure at this time
Switching off of the BMT 932, temperature at next switching on
High Alarm, Concentration and Channel, on which alarm occured
High Alarm cleared, Concentration and Channel
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