OZONE ANALYZER BMT 964 Manual, Rev. 04/2021
41
Caution: If the generator feed gas contains nitrogen, connect a tube to the outlet of the ozone
destruct to lead away the vent gas. Corrosive nitric acid will be formed when vent gas comes in
contact with the moist ambient air. We strongly recommend to lead away the gas exititing the
catalytic ozone destruct using PTFE tubing 1/4" x 5/32"(or 4 x 6 mm). The Catalyzing Cartridge
CAT-35 (left side of the cabinet) has an outlet bore hole with female thread G 1/8 which nor-
mally is equipped with a fitting for this kind of tubing. Other types of fitting can be delivered on
request, or be screwed into the G 1/8 thread by the user.
Caution: In case the ozone generator is serviced or repaired it is imperative that the ozone ana-
lyser is disconnected (the sample gas flow is interrupted). We recommend installation of a stop
cock or a shut-off valve for this purpose.
We recommend replacement of the catalyst material in the Catalyzing Cartridge once per year in
case the oxygen feed gas contains a significant amount of nitrogen or other gases (e.g. PSA oxy-
gen, or with nitrogen doping). For replacement order "REFILL".
Operation
The operation of the BMT 964 C is the same as of the standard BMT 964, see chapters 1 to 14!
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 0.8 l/min, and the red ruby ball inside
the flow meter is not at its upper white stop!
Warning: Disconnect electrical power before opening the cabinet door.
If the Autozero 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
23.
Note: Setting the Autozero Interval to zero hours also means, that the analyzer 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 default is a purge interval of 24 hours.
Maintenance
The only maintenance recommemded is checkig the sample gas filter insert on a regular basis.
The insert of pure white material 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 under an overpressure.
The interval of filter insert replacement has to be evaluated by the user. This interval depends on
the degree of cleanliness of the ozone sample gas. Spare filter inserts are provided inside of the
cabinet.
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