BMT Messtechnik ozone analyzers and instrumentation components

Engineering background and photometric technology of BMT Messtechnik

Founded in Berlin in 1975 by Dr.-Ing. Franz Wallner, BMT MESSTECHNIK GmbH is recognized internationally for precision optical measurement and analytical instrumentation.

Since the early 1980s, the company has focused on gas analysis based on dual-beam ultraviolet absorption photometers utilizing low-pressure mercury lamps at 254 nm in accordance with the Beer-Lambert law.

From its manufacturing facility in Stahnsdorf near Berlin, BMT delivers measurement instruments for semiconductor fabrication, municipal water purification, pharmaceutical synthesis, and industrial oxidation processes requiring long-term zero-point stability and measurement precision.

Design architecture and automatic compensation in BMT 965 ST analyzers

The BMT 965 ST high-concentration ozone analyzer is engineered for integration into industrial control consoles and ozone generation skids.

Featuring a dual-beam optical layout equipped with synthetic quartz absorption cuvettes, the instrument measures process gas streams containing up to 600 g/Nm3 of ozone.

Built-in micro-transducers measure absolute gas pressure and temperature inside the cuvette to calculate normalized concentrations automatically.

An integrated internal solenoid purge valve allows fully automated zero-point calibration cycles without interrupting process gas delivery or disconnecting sample lines.

Operational features of BMT 965 C cabinet analyzers in water treatment

Constructed for demanding industrial environments, the BMT 965 C analyzer is enclosed within an IP65 splash-proof powder-coated aluminum housing. The system incorporates an inline sample gas filter, a precision metering needle valve for gas flow adjustment, and a visual sample rotameter.

Exhaust gas exiting the optical cuvette passes directly into an integrated CAT-RS catalytic ozone destructor containing manganese-copper catalysts to protect operators.

Maintenance routines include inspecting fluoropolymer sample tubing, verifying needle valve resistance, and periodically refreshing catalytic media inside the destructor cartridge.

Ultrapure water monitoring with BMT 965 AQ dissolved ozone sensors

The BMT 965 AQ inline photometric sensor delivers continuous measurement of dissolved ozone in ultrapure water (UPW), deionized water, and sterile solutions up to 150 g/m3.

Widely implemented in wet chemical wafer cleaning benches in semiconductor manufacturing and pharmaceutical water loops, the sensor maintains optical repeatability under steady flow rates.

For processes involving aggressive hydrofluoric acid chemistries, the specialized BMT 965 AQ/HF variant features sapphire optical windows and fluorocarbon body materials. Connection to a remote display unit BMT 965 RD allows monitoring from cleanroom stations safely isolated from fluid circuits.

Multi-channel ambient air safety monitoring with BMT 932 systems

The BMT 932 19-inch rack-mount monitor continuously inspects ambient air for ozone leaks across manufacturing halls and generator rooms.

Its modular multi-channel manifold sequentially cycles through up to six independent sample intake lines with distinct programmable warning and emergency safety thresholds.

Integrated emergency shutoff (EMO) relays automatically trigger facility exhaust ventilation and interlock generator power circuits upon exceeding limit concentrations.

Periodic calibration checks utilize portable test sources such as AOS 2 or BMT 803N, providing verified test mixtures under controlled laboratory conditions.

Sample gas preparation with thermoelectric Peltier dehumidifiers DH6

Accurate photometric ozone determination requires the complete absence of liquid droplet condensation within the optical measurement path.

The thermoelectric BMT DH6 sample gas dryer employs solid-state Peltier elements to chill incoming sample streams, condensing and draining excess moisture prior to cuvette entry.

Fully backward compatible with earlier DH5 installations, the unit combines with DT 50 liquid traps and inert SGF series particulate filters to shield quartz optics, reduce corrosion, and sustain calibration stability across extensive service intervals.