Process monitor

The Comtec 6000 is an in situ O2 and CO (combustibles) flue gas and process gas analyser. The sensor utilises 'leak-proof' zirconia cell technology and will operate in flue gas temperatures up to 1400°C. Versions are available for installation in hazardous locations and harsh environments such as lime kilns.

The product is suitable for flue gas monitoring and process control in the cement, power generation, paper, incineration, petrochemical and similar industries. The probe installs directly inside the duct for direct, continuous real-time readings of O2 and CO, without the need for expensive sample conditioning systems. It is designed to be maintenance free, with minimal calibration requirements and user-friendly operation.

O2 is measured using the zirconium oxide principle and the Nernst equation. Process gas flows around the outside of a measurement probe which is sealed off by means of a heated zirconium-oxide measuring cell. A reference gas with a known O2 concentration flows around the measuring cell from the inside, and a voltage in mV is created between the two surfaces of the cell. At a constant temperature in the cell this voltage is dependent only on the ratio of O2 concentration. Enotec's leak-proof seal between the reference gas and process gas prevents any distortion of the measurement result.

CO is measured using the Ga2O3 principle. Metal oxide sensors consist of an active layer whose resistance changes when exposed to the gas being measured. This changing resistance is sensed by electrodes and is proportional to the CO concentration. Ga2O3 sensors show fast response time, low cross-sensitivity and stable long-term sensor properties.