Probe Samples And Cools Hot Gas

Simple concentric-tube gas-sampling probe, developed to sample hot gas streams. Includes straight outer tube and inner tube, bent to be concentric to outer tube at one end and tangent to outer tube in sampling region at other end. Two tubes brazed together along sampling region and at end to prevent sampled gas and cooling stream from mixing. Inner tube contains sampled gas, and space outside inner tube but inside outer tube path for cooling stream.