OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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59
Operation
The basic operation of the Off-Gas Cabinet is the same as of the standard BMT 965 ST, see chap-
ters 1 to 14 for details!
Adjustment of Sample Flow: The sample gas flow is produced by the sample gas pump SGP5, and
is set in the factory. Corrections may be made by adjusting the trim pot on the pump's electronic
board, see graphics under Electric Connections. The recommended flow rate is about 0.5 l/min.
Warning: Make sure that the flow rate is not higher than the range of the flow meter, and the ball
inside the flow meter is not at its upper stop!
Warning: Disconnect electrical power before opening the cabinet door.
If the Auto Zero Interval is set to zero hours, the zeroing is not automatically activated by the
purge timer, anymore. It still may be initiated by the various manual zeroing commands described
on page 15.
Note: Setting the Auto Zero Interval to zero hours also means, that the analyser does not go
through the purge cycle and does not activate the Purge Unit! In this case, the user shall never
initiate zeroing with ozone applied to the inlet of the Cabinet.
Factory setting of the Auto Zero Interval is 24 hours.
Maintenance
The only maintenance recommended is checking the sample gas filter insert on a regular basis. The
filter insert is of pure white material which easily shows most kind of dirt, except if the dirt is white.
Warning: Before opening the sample gas filter, make sure that the sample line does not contain
ozone gas, and is not under an overpressure.
The interval of filter insert inspection and replacement has to be evaluated by the user. This interval
depends on the degree of dirtiness of the ozone sample gas. Spare filter inserts are provided inside
of the cabinet.
For further description of the functions and properties of the cabinet version please refer to the
main part of the manual.
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