OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
___________________________________________________________________________
62
The inlet and outlet fittings are 1/4" PFA Flaretek (for 1/4" OD PFA tubing). A Flarelok version
is available. Two additional 1/4" SS Swagelok fittings are provided to flush the inner space of the
SENSOR enclosure with dry air, in case the water temperature is below the ambient, to prevent
condensation of water vapor on the cooled inner surfaces.
Materials in contact with the ozonized water are only quartz glass, PTFE, FFPM and PFA (sap-
phire, PTFE, FFPM and PFA in the HF version).
The instrument must be mounted with the arrow on the front panel pointing upwards!
Measurement ranges and associated maximum rated pressure:
BMT 965 AQ BMT 965 AQ/HF
10 ppm
w
(max. 1 bar g) 10 ppm
w
(max. 2.5 bar g)
- 20 ppm
w
(max. 2.5 bar g)
50 ppm
w
(max. 4 bar g) 50 ppm
w
(max. 2.5 bar g)
100 ppm
w
(max. 4 bar g) 100 ppm
w
(max. 2.5 bar g)
150 ppm
w
(max. 6 bar g) 150 ppm
w
(max. 2.5 bar g)
Some ranges may be ordered compatible with up to 20 % hydrofluoric acid (BMT 965 AQ/HF,
see table). Pressure and temperature compensation (which is standard in our gas analysers) is not
provided because it is not necessary here. Rated pressure is listed above.
We recommend a water flow rate between 100 and 300 cm
3
/min. Pressure head (with 2x50 cm
PFA tubing, 4 mm ID, connected to the inlet and outlet fittings) is about 7.5 cm H
2
O for a flow
rate of 100 cm
3
/min, 18 cm H
2
O for 200 cm
3
/min, and 33 cm H
2
O for 300 cm
3
/min. The
OZONE-IN-WATER SENSOR usually is used as a bypass to a small flow resistance in a large
diameter main PFA tubing line. The SENSOR then should be positioned beneath the main tubing
to let gas bubbles bypass the SENSOR.
If a throttle (flow resistance) is installed to control the flow rate through the OZONE-IN-WATER
SENSOR, this throttle must be positioned behind the sensor (never in front of it!), because gas
could bubble out of the water after a pressure drop and disturb the measurement.
When the fluid to be measured is at a temperature lower than the ambient, flushing of the instru-
ment with clean dry air (or nitrogen) is necessary to prevent condensation of water. Flow rate of
the dry gas should be about 0.2 l/min.
As long as the cuvette of the SENSOR remains clean, zeroing of the instrument is not necessary
for weeks, or even for months. But for safety, zero reading should be checked on a regular basis
by applying water with zero ozone concentration. For checking zero reading no other method
is possible. Zeroing has to be initiated by pressing the push button ZERO at the optional
REMOTE DISPLAY BMT 965 RD, or via the binary input at pins 5 and 6 of the signal connector,
or RS-232, or USB (for details see the main part of the manual). Prior to zeroing the analyser, it
has to be assured that the cuvette is filled with water having zero ozone concentration.
In the BMT 965 AQ series of sensors, the isolated signal outputs are tied to Protective Ground by
10 MΩ.
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