Progress in the development of a self-powered carbon monoxide safety control system for application to gas appliances is reported. A comparison of the various possible technologies is made, and the relative strengths and weaknesses of each are discussed. Results of an experimental study of a chemioptical sensor, describing its CO sensitivity, dose response time, reusibility, and dependence on temperature and humidity are presented. The effects of four interfering gasses, ammonia, hydrogen sulfide, acrolein, and formic acid, are also included. Details are shown for a safety control system now undergoing field tests in gas room heaters.

Units: I-P