OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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5
1 General Description
The OZONE ANALYZER BMT 965 is a microprocessor-based dual beam photometer
(UV 254 nm) for measuring the ozone content in air or oxygen. To evaluate the ozone content in
the sample gas the OZONE ANALYZER BMT 965 measures the UV radiation in the measure-
ment channel, the UV radiation in the reference channel, the temperature and the pressure in the
cuvette.
The ozone concentration is displayed in either percent weight of ozone (%wt/wt), grams of ozone
per normal cubic meter of sample gas (g/Nm
3
) or ppm
v
(AQ: g/m
3
or ppm
w
) on a 16-character
alphanumeric display. The concentration unit can be changed during operation. Additional modi-
fiable parameters are, among others:
Unit of pressure display (selectable: bar, psi, Torr, MPa)
Alarm parameters (high/low threshold, alarm latching, audible, opening or closing relays)
Nature of the carrier gas: air or oxygen (incl. PSA)
Date and time
RS-232 interface parameters
Logging parameters
These parameters can be set with the three pushbuttons on the front panel as well as by connecting
the serial interface or USB port to a Windows-PC running the program BMT 965 Link, which is
supplied with each instrument. Another way of configuring the instrument is to use the so-called
Link Mode via the serial or USB interface.
The instrument has a built-in clock with calendar, which is used to provide time stamps for an
Event-Log and an Error-Log (e.g. Overrange, Cuvette Dirty) with virtually unlimited capacity on
an internal 8 GB SD card. Additionally, concentration data can be logged in configurable time
intervals into binary and CSV (Excel) files. The binary logs can be read out and printed via the USB
port with the mentioned program BMT 965 Link. Excel can open the CSV concentration log di-
rectly on the BMT 965, because the instrument will show up on the PC as an external drive when
connected via USB, allowing simple copy action of stored files using Windows Explorer without
installing any additional software or drivers.
The USB port supports OTG (On-the-Go) functions, which means that the BMT 965 can be used
as a USB device (mass storage and HID) or host (mass storage). This way also a USB flash drive
(stick) can be connected to the instrument. Log data from the internal SD card can be copied to
the USB flash drive by pressing a single button on the front panel. Firmware updates using a USB
flash drive are easily done.
The BMT 965 Cabinet, Off-Gas and AQ versions already have Ethernet hardware, allowing LAN
and Internet communication with future firmware upgrades.
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