OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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35
Low Alarm cleared, Low Alarm Limit
Error- and Event Log play an important role in troubleshooting.
12 Concentration Logs
Two concentration logs which are stored on the internal SD card can be activated either on the
front panel menu or in BMT 965 Link: a binary log and an Excel-compatible CSV-log. Both logs
record time stamped concentration values in intervals, which can be set from 1 s to 9999 s. Con-
centration logs can be deleted either from the front panel menu, within BMT 965 Link, or with the
BMT 965 mounted as an external USB drive on a computer with Windows Explorer. The names
of the logs contain the serial number of the instrument.
The log interval should be set in a reasonable way. Factors which should be considered when
choosing a log interval are:
- Resulting file size (influences download time)
- Recording time (influences download time)
- Gas concentration variation over time (ozone concentration of large generators will usually
vary slowly, needing less log entries per time than small lab setups)
- Data volume capacity of software which should work with recorded data (Excel e.g. can
only handle 1048576 data points)
USB download speed and copy to USB flash speed are about 700 KB per second. The following
table shows some examples of reasonable recording times and log intervals and the corresponding
files sizes and download times:
Recording time Log Interval Binary File Size
[Mbyte]
CSV File Size
[Mbyte]
Binary Down-
load Time
[s]
CSV Download
Time
[s]
24 hours 1 s 0.7 2.6 1 3.7
1 week 5 s 0.98 3.64 1.4 5.2
1 month 20 s 1 3.73 1.4 5.3
1 year 1 minute 4.3 15.8 6.1 23
10 years 10 minutes 4.3 15.8 6.1 23
10 years 1 minute 43 158 60 230
The last example would create a file which Excel would not be able to handle.
Caution: Log file size should not exceed 4 GB (max. FAT32 file size). With log interval set to
1 second, this limit would be reached after 17 years for the binary log and after 4.6 years for the
CSV-log.
13 The Program BMT 965 Link
On the SD card which is delivered with the instrument you will find the Windows program
BMT 965 Link, which is using the Link Mode as described on page 28, and in Appendix A. It has
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