Ozone gas analysis with the ULTRA.sens®

Product catalog summary

Introduction
The document discusses the ULTRA.sens® ozone measurement module developed by Wi.Tec-Sensorik GmbH, which utilizes UV LEDs for ozone gas analysis, offering a mercury-free alternative to traditional methods.

Ozone Characteristics and Applications
Ozone (O3) is an unstable gas with a half-life of 20-100 hours, requiring production via an ozone generator. It is a potent oxidizing agent used for sterilizing surfaces, water, and air. The ULTRA.sens® AK250 can measure ozone concentrations from 0-1000 ppb with a detection limit of <5 ppb.

Technology and Methodology
The ULTRA.sens® uses a UV photometer with UV LEDs ranging from 230 nm to 400 nm to measure gas absorption, applying the Lambert-Beer law for precise concentration calculations. The system is modular, allowing for different analyser cells and cuvette lengths based on concentration levels. It can measure multiple gases, including SO2, NO2, Cl2, and H2S, and can be combined with NDIR measurement for complex gas mixtures.

Auto-Zero Function
To maintain zero-point stability, especially at low concentrations, the ULTRA.sens® includes an auto-zero function. This involves a reference measurement to compensate for UV LED intensity changes and an automatic zero-point adjustment using a solenoid valve and timer to switch between sample and zero gas.

Figures and Diagrams
Figures in the document illustrate the ULTRA.sens® module with integrated auto-zero function, a gas flow diagram with the auto-zero function, and a process version of the analyser cuvette for high ozone concentrations.

Contact Information
Wi.Tec-Sensorik GmbH is located in Wesel, Germany, with contact details provided for further inquiries.

Catalog excerpts

Ozone gas analysis with the ULTRA.sens®-1

Ozone gas analysis with the ULTRA.sens® based on selective UV light-emitting diodes Figure 1: ULTRA.sens® ozone measurement module with integrated auto-zero function (AZF) Ozone O3 is an unstable gas that is formed by adding energy with oxygen. The service life (half-life) of ozone is approx. 20-100 hours, after which it decomposes back into oxygen O2. Ozone must therefore be produced in an ozone generator before use. Appropriate gas sensors are required to control the ozone concentration. Until now, toxic mercury vapour lamps have been used as the radiation source in these gas sensors. Wi.TecSensorik GmbH has now succeeded in developing a gas sensor based on UV LEDs that is mercury-free and delivers excellent measurement results. Ozone is used to sterilise surfaces, water and air, as it is a strong oxidising agent and therefore kills viruses, bacteria, fungi, etc. Its intense odour makes it perceptible even in very low concentrations (<<1ppm). The odour threshold is around 0.02 ml/m³ (0.02 ppm). Ozone measuring devices must therefore be able to detect even the smallest concentrations in the ppb range. With the ULTRA.sens® AK250, measuring ranges of 01000ppb O3 can be realised with a detection limit of <5ppb O3.

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Ozone gas analysis with the ULTRA.sens®-2

NDUV ULTRA.sens® Wi.Tec-Sensorik GmbH uses a special UV photometer (ULTRA.sens®) for this purpose, which utilises different UV light-emitting diodes (UV LEDs) as radiation sources in the range from 230 nm to 400 nm. In the UV photometer, the gas sample to be analysed is irradiated by pulsed UV radiation and the proportion of absorption in the cuvette is measured. The concentration in the cuvette can be calculated very precisely from this absorption using the Lambert-Beer law. This calculation is supplemented by additional algorithms so that the analysis result is independent of the current air...

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Ozone gas analysis with the ULTRA.sens®-3

Figure 2: Gas flow diagram with upstream auto-zero function (AZF) Figure 3: ULTRA.sens® with a 25 mm long analyser cuvette (AK25) in process version (stainless steel) for detecting high ozone concentrations in the vol.% range. Data Sheet: ULTRA.sens O3-Gasanalyse Wi.Tec-Sensorik GmbH Schepersweg 41-61 D-46485 Wesel Germany

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