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OXYMAT 64 works with ZrO2 sensors, which is measuring gas with steady flow through a 650°C heated, pipe-shaped sensor. The outside of the sensor is put out in ambient air and works as an authoritative electrode. By the concentration differences on both sides rules a different partial pressure. Since ZrO2 is led electrically with 650°C, an ion wandering occurs in the direction of the lower partial pressure. A potential difference arises between both electrodes where a measurement of the oxygen concentration in the measuring gas is achieved.