Apparatus for the measurement of electrical conductivity in combustion zones

Claim 1

APPARATUS FOR THE MEASUREMENT OF ELECTRICAL CONDUCTIVITY IN COMBUSTION ZONES COMPRISING A SUBSTANTIALLY CYLINDRICAL CLOSED VESSEL, A CYLINDER CONCENTRICALLY ARRANGED IN SAID VESSEL AND SPACED APART THEREFROM TO FORM A DOUBLE WALL STRUCTURE, THE LOWER END OF SAID CYLINDER PASSING THROUGH THE LOWER END OF SAID VESSEL AND HAVING AN AIR INLET PROVIDED THEREIN, THE UPPER END OF SAID CYLINDER BEILNG OPEN AND LEAVING A GAP BETWEEN SAID CYLINDER AND SAID VESSEL FOR COMMUNICATION WITH THE SPACE THEREBETWEEN, AN EXHAUST OUTLET IN THE LOWER END OF SAID VESSEL AND COMMUNICATING WITH SAID SPACE, A BURNER WITH AN ORIFICE IN THE UPPER PART OF SAID CYLINDER, A PAIR OF ELECTRODES ARRANGED ON OPPOSITE SIDES OF SAID ORIFICE AND A PAIR OF INSULATORS SUPPORTING SAID ELECTRODES, SAID PAIR OF INSULATORS BEING ARRANGED UPSTREAM OF SAID ORIFICE WITHIN A STREAM OF AIR PASSING FROM SAID AIR INLET TO SAID EXHAUST OUTLET, THE TEMPERATURE OF SAID STREAM IN THE VICINITY OF SAID INSULATORS BEILNG SUBSTANTIALLY BELOW THE TEMPERATURE AT SAID ORIFICE.