Patent ID: 8024982

Claim:
A sensing unit to sense a plurality of parameters of a fluid in an interior of a duct defined by a duct wall having an exterior surface and including a portion defining a duct aperture, said sensing unit comprising: (a) an enclosure including: (i) a first enclosure portion including a mounting surface and arranged for attachment to said exterior surface of said duct wall with said mounting surface abutting said duct wall; and (ii) a second enclosure portion rotatably attached to said first enclosure portion and arranged to extend through said duct aperture when said mounting surface abuts said duct wall, said enclosure arranged such that attachment of said first enclosure portion to said duct wall secures a rotational position of said second enclosure portion relative to said first enclosure portion; (b) a pressure sensor supported by said enclosure and responsive to a pressure at a first inlet and a pressure at a second inlet remote from said first inlet; and (c) another sensor supported in said fluid by said enclosure.