An apparatus for the treatment of a waste gas that is capable of recovering the heat generated by the catalytic oxidation of a waste gas to the largest possible extent and allowing the temperature of the treated gas in a first waste gas pre-heater to be adjusted to an arbitrary level incapable of condensing moisture andor corrosive gas is provided. The configuration provides minimal addsubtract circuit blocks for the WHT by using stages, each stage containing a shift register connected to an addsubtract circuit. A particular application of the device is for a radiation detector. The mobile node includes a function to dynamically acquire a home address.