Measuring the smallest concentrations of oxygen

Siemens has developed the Oxymat 64, a new gas analyser that can reliably measure small concentrations of oxygen in gases, down to 0-10 ppm

Measuring oxygen concentrations down to levels of 0 to 10 parts per million makes the Oxymat 64 especially suitable for use in air separation plants, technical gas production, welding applications in a protective atmosphere, hardening shops, the chemical industry and the food and beverage industry.

The new 19'' gas analyser extends the Oxymat 6 series from Siemens Automation and Drives that has been used for the past 10 years with measuring qualities up to 50 parts per million.

Oxymat 64 uses the same operator interface and display unit as the other devices of the series as well as the same electronic modules and mechanical components.

The core of the analyser is a commercially available, tubular ZrO2 (zirconium dioxide) sensor which is field-proven for many years.

The sensor is heated up to 650C and sample gas passes through with constant flow rate, while the exterior of the sensor is exposed to the ambient air.

The difference in concentration on both sides results in a potential discrepancy that is a gauge of the concentration of oxygen in the sample gas.

Depending on the application, there is an option between a catalytical inactive ZrO2 sensor and a catalytical active ZrO2 sensor, which are both characterised by a high level of linearity: but they differ in the electrode material that reacts differently to the accompanying combustible components.

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