Potentiometric gas sensors for use at high temperatures

The use of sensors to monitor gaseous species in various processes is discu ssed. Most solid electrolyte sensors that are used in gases involve electro lytes which conduct the ion of the species to be measured. However, this is not possible for sulphur and nitrogen and in order to overcome this proble m, cation conducting electrolytes have been synthesised which respond to ni trogen and sulphur. For gases containing two elements, novel sensors, based upon two electrolytes, have been developed, whose potential in a multicomp onent gas mixture is independent of the oxygen content and do not require h igh temperature gas seals or separate references. MST/4486 (C) 2000 IoM Com munications Ltd.