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965-AQ/HF Front
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Right
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Back
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Left
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF -RD Alt
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Top
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Bottom
Ozone-in-Water Sensor BMT 965 AQ/HF
965-AQ/HF Front
965-AQ/HF Front
965-AQ/HF Right
965-AQ/HF Right
965-AQ/HF Back
965-AQ/HF Back
965-AQ/HF Left
965-AQ/HF Left
965-AQ/HF -RD Alt
965-AQ/HF -RD Alt
965-AQ/HF Top
965-AQ/HF Top
965-AQ/HF Bottom
965-AQ/HF Bottom

The OZONE-IN-WATER SENSOR BMT 965 AQ is a UV photometer for direct measurement of the ozone content of ultra-pure water, or water with constant turbidity. A special version BMT 965 AQ/HF for up to 20% hydrofluoric acid is available. Materials in contact with the ozonated water are: PTFE, FFPM, PFA and quartz or sapphire.

The BMT 965 AQ is a SENSOR because it does not have a display. It is designed to directly be connected to a workstation via a 4 - 20 mA, or 0 - 10 V signal line.

An optional Remote Display BMT 965 RD is available. To operate with the Remote Display, the BMT 965 AQ has to be ordered with the option: interface for Remote Display. 

Superior stability of the photometer is achieved by use of a true dual beam optical system with an extremely long-life mercury lamp. MTBF of the instrument, including the lamp, is in excess of 65,000 hours. Excluding the lamp, it is 120,000 hours.

An eight gigabyte non-volatile log memory is included, providing virtually unlimited storage capacity for concentration and error logs. If connected to a PC, the instrument acts as an external USB drive, from which concentration and error logs can be downloaded. Logs can also be copied and firmware can be upgraded without an external computer just by connecting a USB flash drive.

Complete control of all operating parameters is provided with the Windows software BMT 965 Link.

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The OZONE - IN - WATER SENSOR BMT 965 AQ comes in a splash proof aluminum enclosure (IP 65, NEMA 4X) 260 x 160 x 91 mm (W x H x D) with sea water resistant coating (RAL 5009, azure), and weighs about 3 kg. Four mounting brackets are provided for installing the SENSOR where it is needed, e.g. underneath a work bench. All electric connectors are water proof.

When the fluid to be measured is at lower temperature than the ambient, flushing of the instrument 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.

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 after a pressure drop disturbing measurement.

The flow rate must not exceed the maximum of 0.3 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. Additional BMT Products (for details, refer to the appropriate data sheets):

  • BMT 965 AQ-LC for low concentration measurement in ultra-pure DI (de-ionized) water
  • BMT 965 (standard version) for ozone measurement in the gas phase
  • BMT 932 Ozone Monitor for TLV monitoring in ambient air(1, 3 & 6 channels)
  • BMT 802N (4 g/h) & BMT 803N (8 g/h) Ozone Generators

  • Monitoring of ozone in ultra-pure water, or water with constant turbidity (or hydrofluoric acid solution up to 20% HF)
  • Semiconductor ozone processes
  • Dual beam UV photometer
  • Long-life mercury lamp
  • Warranty 3 years, 5 years on the UV lamp
  • High accuracy, error less than 0.5%
  • Ranges from 10 to 150 g/m3 (ppmw)
  • HF resistant version available
  • Relay contact for control of external zeroing valve
  • Error handling includes: summary error, lamp low, cuvette dirty, overrange
  • Early warnings: lamp low, cuvette dirty
  • Key functions programmable via optional Remote Display, or a Windows PC
  • High and low limit alarms
  • 4-20 mA and 0-10 V isolated outputs
  • 8 GB non-volatile log memory (binary and Excel CSV)
  • USB On-The-Go, Firmware upgrades in the field
  • Option: RS-232 interface (bidirectional, isolated)
  • Option: Remote Display for readout and control
  • Backward compatible to BMT 964 AQ(/HF)

Measurement Principle  dual-beam UV photometer (254 nm), no moving parts

MTBF  instrument incl. UV lamp 65,000 h, excl. UV lamp 120,000 h

UV LAMP  low pressure mercury lamp, long life design, burnt-in for 300 h

Concentration Ranges  50, 100, 200, 300, 400, 500, 600 g/Nm3, selectable units g/Nm3, %wt/wt and ppmv 10, 20 g/Nm3, selectable units g/Nm3, %wt/wt and ppmv

Accuracy  after zeroing the max. error is the sum: 0.4% of measurement 0.1% of scale

Repeatability Error  0.2 % of measurement

Response Time  0.1 s (analog output), 0.3 s (display)

Zero Drift  typ. 0.2% of range per day, after warm-up, non-cumulative

Max. Inlet Pressure

 10 g/m31.0 barg2.5 barg
 20 g/m3 - 2.5 barg
 50 g/m3 4.0 barq 2.5 barg
 100 g/m3 4.0 barq 4.0 barg
 150 g/m3 6.0 barq 4.0 barg

Ambient Temperature  0 - 50 °C (non-condensing)

Materials In contact With Ozone  quartz, PTFE, PFA, FFPM (HF vers.: sapphire, PTFE,PFA,FFPM)
Fluid Ports  1/4‘‘ Flaretek
Recommended Flow Rate  0.1 to 0.3 l/min typical
Pressure Drops  approx. 45 mbar at 0.3 l/min
Signal Outputs  concentration 4 - 20 mA (isolated, active)  concentration 0 - 10 V (isolated)
Concentration Alarms  High Alarm, Low Alarm, latching, not latching
Control Input  set to zero (24 V, 8 mA, isolated)
Control Outputs  relay contacts, 28 V, 0.5 A, isolated:
       Lamp Low Warning
       Cuvette Dirty Warning
       High Alarm
       Low Alarm
       Purge Control
Error handling  Error Relay: 30 V, 0.5 A,  summarizing instrument failures.
Early Warnings  Lamp Low Error, Lamp Off Error, Cuvette Dirty Warning, Cuvette Dirty Error, Overrange, Serial Interface (option)  Overpressure, Lamp Low Warning, Cuvette Dirty Warning, RS-232, bidirectional, isolated, 2400 - 38400 Baud
Memory  8 GB for error and concentration logs
USB  On-The-Go, Device/Host mode, Full speed
Automatic Zeroing  possible via control input
Software  BMT 965 Link, instrument configuration and readout of Concentration, Event and Error Logs on a Windows PC
Power  wide range input: 100 - 240 VAC, 15 VA  optional: 12 - 36 VDC, 15 W
Dimensions  260 x 160 x 91 mm
Weight  3 kg

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