Apparatus for measuring the carbon level of furnace gases

Claim 1

A DEVICE FOR MEASURING THE CARBON LEVEL OF THE ATMOSPHERE OF A FURNACE CHAMBER, COMPRISING AN ELONGATED TUBULAR PROBE EXTENDING INTO SAID CHAMBER, SAID PROBE HAVING AN EXTREMITY INSIDE SAID FURNACE CHAMBER DIVIDED INTO A FIRST AND A SECOND COMPARTMENT, A CARBOPHILOUS RESISTNACE ELEMENT IN EACH OF SAID COMPARTMENTS, SAID FIRST COMPARTMENT BEING PROVIDED WITH AN ORIFICE OPENING INTO SAID FURNACE CHAMBER AND WITH A FIRST INTERNAL APERTURE OPENING INTO THE INTERIOR OF SAID PROBE, INLET MEANS COMMUNICATING WITH SAID SECOND COMPARTMENT FOR ADMITTING INTO SAME A GASEOUS MEDIUM OF GREATER-THAN-ATMOSPHERIC PRESSURE HAVING A PREDETERMINED CARBONIZATION COEFFICIENT, SAID SECOND COMPARTMENT BEING PROVIDED WITH A SECOND INTERNAL APERTURE COMMUNICATING WITH THE INTERIOR OF SAID PROBE ADJACENT SAID FIRST INTERNAL APERTURE, OUTLET MEANS AT THE END OF SAID PROBE OPPOSITE SAID EXTREMITY FOR DISCHARGING SAID GASEOUS MEDIUM FROM SAID SECOND COMPARTMENT AND ENTRAINED FURNACE GASES FROM SAID FIRST COMPARTMENT INTO THE OPEN, AND CIRCUIT MEANS CONNECTING SAID ELEMENTS IN A RESISTNACE-MEASURING CIRCUIT, SAID CIRCUIT MEANS INCLUDING ELELCTRICAL METER MEANS FOR INDICATING A DIFFERENCE IN THE ELECTRICAL RESISTANCES OF SAID ELEMENTS.