Patent ID: 8146445

Claim:
A sampling probe apparatus for extracting gas samples from a fluid stream, comprising: a probe head having an upstream face and a downstream face, an inwardly tapered intake orifice extending from the upstream face to a first opening into a central bore region of a cavity within the probe head, and an outlet orifice extending from a second opening out of said central bore region to the downstream face, so as to permit fluid gas flow through the central bore region of the cavity; a tubular filter device disposed within the cavity and extending between the intake orifice and the outlet orifice, with a longitudinal axis of the tubular filter device extending from the intake orifice to the outlet orifice, so as to divide a low-pressure sampling region of the cavity from the central bore region; and a sampling tube, in fluid communication with the low-pressure sampling region, for extracting gas samples from the low-pressure sampling region of the cavity.