Thermopile construction with multiple EMF outputs

摘要

A thermopile construction adapted for use as an electric generator capable of producing multiple EMF outputs in response to heat as from a pilot flame. A cluster of hot and cold thermocouple junctions are arrayed within a housing. The hot junction of one of the thermocouples, located at the beginning of the array, extends beyond the other hot junctions for greater sensitivity to changes in temperature as from a pilot flame and surrounding radiating surfaces. While being a part of the array, the longer thermocouple also has extension wires at the cold junction thereof to deliver the EMF of that couple alone to a control device requiring a small EMF. One such wire serves also as one of two leads for delivering the EMF of the entire array to an electromechanical device that requires a larger EMF. Additional extension wires can be added to obtain intermediate EMF values.