Craig & Antonelli
Method and apparatus for determining ammonia concentration of gas
 An ammonia gas to be determined, and an oxidative gas containing nitrogen oxides in moles more than those of the ammonia are brought into contact with an analytical catalyst capable of forming nitrogen and water from ammonia and nitrogen oxides. Concentrations of nitrogen oxides of the gas before and after the contact with the analytical catalyst are determined, and an ammonia concentration of the gas is determined by converting the difference between the concentrations of nitrogen oxides to the ammonia concentration by calculation. 
Babcock-Hitachi K.K. Hitachi, Ltd. Mitsubishi Petrochemical Company Limited
G G Y G Y
G01N G01N Y10T G01N Y10T
inventional inventional additional inventional additional
Shimpei Makoto Yoshihisa Shigeo Masato Akira Fumito
Matsuda Imanari Watanabe Uno Takeuchi Kato Nakajima