PAROX 1200 Paramagnetic O2 sensor for precise and maintenance-free operation Description The PAROX 1200 paramagnetic oxygen sensor module is designed for incorporation in your analyzersystems or for the solution of oxygen measuring problems using a microprocessor or a PLC-based system. The sensor module is maintenance-free, have a long lifetime, give a rapid and accurate signal response and is virtually insensitive to other gases. It has a compact design which meets high quality standards and easy implementation. Measuring principle Paramagnetic sensor module works on the principle of oxygen partial pressure measurement with a rotatable glass dumbbell. The sensor is heated up to 55°C. Oxygen is one of the few gases showing significant paramagnetic properties which can be used for its measurement using the following method: A small glass dumbbell filled with nitrogen is placed in an inhomogeneous magnetic field within the measuring cell. The system’s static position is defined by a light beam, a mirror on the dumbbell and a photo detector. The dumbbell is diamagnetic and tends to turn away from the magnetic field. The paramagnetic oxygen molecules of the sample gas, however, are drawn into the magnetic field, either displacing the dumbbell or forcing it to turn in the opposite direction. The turning is stopped by an opposite magnetic field generated by the means of a coil around the dumbbell, the signal of the photo detector (deviation of the dumbbell from its static position) determines the necessary current intensity. The difference between the current when pure nitrogen is flowing and the current when the sample gas is flowing across the measuring cell is proportionate to the concentration of oxygen in the sample gas 1/3

Technical Specifications Standard measuring ranges Output value standard Output value (option) Operating Conditions Flow Operating gas pressure Operating temperature Storage and transport temperature Relative humidity 18 ‐ 70 l/h with fix Bypass (Standard) Maximum 250 ml/min (without Bypass) +/-300 hPa (0.3 bar) in operation +/- max. 1000 hPa (1bar) 5 - 45°C, (heated measuring cell = 55°C) -25°C to +65°C 0 - 90% r.h. 80x78x93 mm without electrical connector gas connection Materials of gas conducting parts PVDF, glass, steel 1.4571, gold, viton, platinum-iridium, epoxy resin, nickel 3 mm, 1/8",...

Typical applications for PAROX 1200 • Excess oxygen analysis in all types of combustion systems Room air monitoring for personnel and product safety Monitoring oxygen content in fermentation vessels, biochemical fermenters and sewer gases Monitoring atmosphere in fruit stores and hot-houses Process analysis for continuous monitoring of required and/or allowable oxygen content Monitoring of low-temperature and combustion gases Monitoring automotive exhaust and internal combustion engines Monitoring blanket gases Monitoring tunnel and duct air quality Excess oxygen analysis in controlled atmospheres...

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