OZONE MONITOR BMT 932 Manual, Rev. 02/2021
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The warning signal is also available on the serial interface, both in User Mode and in Link Mode
(command *86#), and in the Error Log. Bit 12 is used for Lamp High Warning (0x1000,
4096 decimal).
The Windows software BMT 932 Link up to V1.21 will run, but will not show the warning. The
log from the old software shows "Unknown Error".
CAUTION:
The UV radiation power output of the UV lamp is less than 1 Watt. Avoid disman-
tling of the instrument with mains power applied. The lamp contains 5 milligrams of mercury.
Mercury is a poison. Dispose lamp at a waste disposal place which is qualified to handle mercury
containing lamps. If you cannot find such a place, please return the lamp to
BMT MESSTECHNIK GMBH.
Scrubber Error
The utility scrubber is checked every 24 hours for its ability to remove ozone from the sample
gas by means of a small ozone generator contained in the OZONE MONITOR BMT 932. If the
utility scrubber fails the test,
Error: Scrubber
is displayed and the Error Relay signals an error. The instrument will continue operating with the
reserve scrubber. Measurement results will be correct but the utility scrubber should be replaced
as soon as possible. The reserve scrubber will also be tested in this mode of operation every
24 hours. If it fails the test, too,
Error: Res. Scrubber
is displayed and the analog outputs put out the maximum possible values (1 V, 10 V and 20 mA).
The information that the utility scrubber has failed will be stored in nonvolatile memory. If pow-
er is removed from the instrument the information will not be lost: the instrument will conduct a
scrubber test after warmup to check if the scrubber was replaced in the meantime. If the scrubber
passes the test the instrument will resume normal operation, if not, it will stay in the error state
described above.
A scrubber failure could have been caused by some reagent entering the OZONE MONITOR
BMT 932 which contaminated the scrubber. In this case, the reagent should be removed from
the sample gas stream before replacing the scrubber.
Overpressure
Cuvette pressure is above the allowed maximum pressure (1.15 bar). The instrument displays
Error: Overpressure
Due to the fact that reliable pressure data are not available, the displayed ozone concentration is
wrong. The Error Relay is in its error position.
