Temperature measuring device

Claim 1

TEMPERATURE MEASURING APPARATUS FOR USE IN A CONTINUOUSLY-MOVING, AXIAL-FLOW GAS STREAM COMPRISING: FIRST WALL MEANS DEFINING AN ELONGATED GENERALLY TUBULAR HOUSING POSITIONED IN SAID GAS STREAM AND CONTAINING A MEASURING CHAMBER, A FORWARDLY-DIRECTED PRIMARY GAS STREAM INLET OPENING, AND A REARWARDLYDIRECTED PRIMARY GAS STREAM EXIT OPENING, SAID INLET OPENING, SAID MEASURING CHAMBER AND SAID PRIMARY EXIT OPENING BEING IN SERIAL FLOW RELATION WITH BOTH OF SAID OPENINGS EXTENDING GENERALLY CO-EXTENSIVELY OF THE LENGTH OF SAID HOUSING; GAS STREAM TEMPERATURE SENSING MEANS RIGIDLY SUPPORTED WITHIN SAID MEASURING CHAMBER; SECOND WALL MEANS LOCATED BETWEEN SAID TEMPERATURE SENSING MEANS AND SAID PRIMARY INLET OPENING, SAID SECOND WALL MEANS HAVING A BAFFLE PORTION AND DEFINING A FLOW PASSAGE CONNECTING SAID PRIMARY INLET OPENING WITH SAID MEASURING CHAMBER THROUGH AT LEAST ONE SECONDARY INLET OPENING, SAID SECOND WALL MEANS REQUIRING AT LEAST ONE ABRUPT CHANGE IN THE DIRECTION OF FLOW OF THE PORTION OF THE AXIAL-FLOW GAS STREAM ENTERING SAID HOUSING THROUGH SAID PRIMARY INLET OPENING WHEREBY FOREIGN PARTICLES ENTRAINED IN SAID PORTION OF SAID GAS STREAM MAY BE SEPARATED THEREFROM PRIOR TO REACHING SAID TEMPERATURE SENSING MEANS; AND MEANS TO TRAP ANY SUCH PARTICLES AND EXHAUST SAID PARTICLES FROM SAID TEMPERATURE MEASURING APPARATUS.