The PEM-9004 is a gas analysis computer for measuring and computing the concentration of various gases in a combustion process. Both toxic and combustible gasses may at times be present in and around the analyzer. This instrument is designed to safely handle specific combustible gas mixtures as outlined in the product specification. Since Teledyne cannot control the end use of this instrument, it is the responsibility of the user to establish whether or not the total system of instrument, environment, alarm components, and any other relevant devices actually will assure safety under the particular circumstances of use.