Patent ID: 7546762

Claim:
A sensor probe located upstream of an exhaust particulate filter and disposed in exhaust gas having carbon particles, the sensor probe comprising: a probe tip having an exhaust gas inlet opening and a probe centerline; a pressure tube fluidly connecting the probe tip with a pressure sensor; wherein a pipe having a pipe centerline is disposable around the probe tip such that said probe tip protrudes into the pipe; said pipe configured to channel exhaust gases such that said carbon particles included in the exhaust gas have a momentum vector at said exhaust gas inlet opening that is parallel to said pipe centerline; wherein the pipe centerline and the probe centerline form an acute angle when the pipe is disposed around the probe tip; and wherein the probe tip points in a downstream direction of the pipe when the pipe is disposed around the probe tip, such that the probe tip is pointed away from the direction of carbon particles traveling along the momentum vector toward the exhaust particulate filter to reduce entry of carbon particles into said exhaust gas inlet opening.