Flame relative carbon dioxide concentration measurement - uses ionization techniques in appts which compares two flames

摘要

An apparatus for measuring the relative concentration of carbon dioxide in two flames, using an ionization measurement technique, is presented. It consists basically of a metallic block (1) containing two parallel cylindrical chambers (2, 3) in each of which a flame is sustained. Each flame is fed from its own full inlet, and air inlet (9, 10) and has its own exhaust outlet and ignition facility. A common electrode (19) is mounted between the chambers and a separate electrode is provided in each chamber (20, 21). Three separate electrodes are of cylindrical shape with axes coincident with the appropriate flame. The electrodes are coated with a suitable insulating layer, typically of polytetra fluorethylene. The signals to and from the three electrodes are taken via terminals (27, 28) from the outside of the apparatus.