OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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14
USB-Interface
The USB connector is a Micro-A/B receptacle, conforming to USB OTG (On-The-Go) specifica-
tions. The instrument communicates at USB Full Speed (12 Mbit/s) and can serve as device or
host on the bus. In host mode only USB flash drives may be connected, no hard drives, because
the instrument cannot satisfy the power demand of a hard drive. For host operation, an adapter
cable is supplied with the instrument.
5 Switching On the Instrument
After application of the mains voltage the instrument will display the following:
BMT965 VX.XX
VX.XX denotes the software version. Then concentration and pressure range will be shown, e.g.:
R: 200 g/Nm
3
PR: 2.5 bar
This display is followed by a warm-up period, the length of which is being determined by the state
of the lamp and environmental temperature. During warm-up the Error Relay is switched to the
error state (contact open). All other relay contacts are open. The analog outputs are set to 10 V
and 20 mA respectively. The serial interface (see page 25) puts out max. concentration, actual pres-
sure and the code for the warm-up-state. The time left for change into normal operating mode is
displayed and counted down in second intervals. The time period between switching on and normal
operating mode can last between 40 s and 120 s. At ambient temperatures less than 15 °C warmup
can last up to 240 s. During this time the front panel keys and the zero-input are deactivated.
6 Zeroing the BMT 965
The zero reading of the instrument (the value displayed without any ozone in the cuvette) may
undergo slight changes, which among others can be induced by
namely: soiling of the cuvette
influence of temperature
In order to compensate these effects BMT MESSTECHNIK recommends zeroing the BMT 965
every 24 hours. Depending on the demands on accuracy and the individual stability of an instru-
ment the time interval between two zeroing actions can be much longer.
It is very important to really make sure that no ozone is present in the cuvette during zero-
ing! Before zeroing the BMT 965 has to be purged with oxygen or filtered air.
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