AbstractIndustry is becoming more aware of the hazards to life and property that accompany the use of flammabl gases and vapors. These problems are becoming so complex that specialized knowledge is necessary to guarantee proper selection of equipment and to maintain the equipment after installation. The selection and use of explosive gas detection equipment should be a coordinated effort between the Safety Engineering and Instrument Engineering Departments. Combustible gas analyzers using the principles of catalytic combusion exhibit the simplicity, flexibility and stability of operation which are the ideal requirements for solvent extraction installations.