OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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51
The Cabinet features a sealed USB connector. All USB operations described for the standard ver-
sion can also be performed with the Cabinet.
For service or maintenance, the cable glands may be unscrewed from the housing, and thus allow
to electrically disconnect the analyser without disconnecting power and signal connectors from the
cable – cables may be fed through the holes together with the connectors.
Two-stage particle filter
The sample gas filter of the BMT 965 C consists of a pre-filter (1 mm porous PTFE, OD 25 mm)
and an ultra fine main filter (6 mm porous PTFE, OD 25 mm). The housing is made of stainless
steel. The total thickness of this combination creates a significant pressure drop as shown in the
following diagram:
For maintenance on the sample gas filter see chapter Maintenance on the next page.
Operation
The basic operation of the BMT 965 C is the same as of the standard BMT 965, see chapters 1 to
14 for details.
Adjustment of Sample Flow: The sample gas flow rate can be set with the red knob (door open,
upper right corner). 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 white stop!
Warning: Disconnect electrical power before opening the cabinet door.
If the Auto Zero Interval is set to zero hours, the zeroing is no more automatically activated by the
purge timer. It still may be initiated by the various manual zeroing commands described on page 15.
0
0,5
1
1,5
2
2,5
0 0.1 0.2
typical flow rate [L/min]
system pressure [bar gage]
BMT 965 C
typical flow rate with pre- and main filter
throttle valve open
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