New process gas analysers for Oxygen and Hydrogen

Siemens has developed two new gas analysers: the Calomat 6 for measuring hydrogen concentrations and the Oxymat 61 for analysing oxygen content, for example in process gases

Siemens Automation and Drives has developed two new gas analysers: the Calomat 6 for measuring hydrogen concentrations and the Oxymat 61 for analysing oxygen content.

The Calomat 6 uses the specific heat conductivity of gases to determine gas concentrations in binary and pseudo-binary gas mixtures.

The Oxymat 61 functions according to the paramagnetic alternating pressure method and is used for simple standard measurements of the oxygen concentration in process gases, for example.

Both devices come equipped with the operating and diagnostic functions required by NAMUR (the chemicals industry standards consortium Normenarbeitsgemeinschaft fur Mess- und Regeltechnik), can be parameterised using Siprom GA software and communicate via Profibus.

The Calomat 6 is most suitable for gases that cannot be measured using NDIR (Non-Dispersive Infrared) or paramagnetic techniques.

For instance, the device can be used for measuring hydrogen content in blast furnace gas and for argon, nitrogen and carbon dioxide mixtures, especially in hydrogen fuel cells and in the cooling process for turbines in power plant engineering.

The new device consists of a physical measurement unit and an electronic evaluation component.

These elements combined with the specific applications software make up the complete analyser package.

To change an application, users only need to change the set of parameters.

Thanks to the use of semiconductor elements as detector material, analysis time is much shorter than traditional measuring methods based on heat conductivity.

The Oxymat 61 features a short response time.

This device is used in such applications as chemical process measurements, burner optimisation in power generation, in air analysis plants as well as the food and beverages industry.

Its sturdy design in a compact measurement unit with no movable parts guarantees low-maintenance operation and a long service life.

By employing a reference gas pump, the oxygen from ambient air can be used as a reference gas.

That means there is no need for the usual external feed.

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