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A system for sensing or measuring the motion of a fluid such as air. The system typically has a two-part plastic body containing an internal flow passage. The parts of the body may snap together or attach with an adhesive. A transducer or an electronic sensor is typically located within the flow pas

A system for sensing or measuring the motion of a fluid such as air. The system typically has a two-part plastic body containing an internal flow passage. The parts of the body may snap together or attach with an adhesive. A transducer or an electronic sensor is typically located within the flow passage, which may measure mass flow rate and may have two resistive thermal devices (RTDs) located on either side of a heat source. The body may have two elongated port tubes configured to attach to tubing. The port tubes may contain venturis, and may be substantially straight and substantially parallel, forming a U shape. A metal lead frame may be provided in electrical communication with the sensor. The lead frame may be integrally molded within the body, and may have a lower coefficient of thermal expansion than the body. The internal flow passage and the sensor may be substantially symmetrical and measure the flow rate of the fluid substantially equally in either flow direction. The system may be configured for surface mounting or for through-hole mounting, and may be a dual in-line type.

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A system for sensing or measuring the motion of a fluid such as air. The system typically has a two-part plastic body containing an internal flow passage. The parts of the body may snap together or attach with an adhesive. A transducer or an electronic sensor is typically located within the flow pas

A system for sensing or measuring the motion of a fluid such as air. The system typically has a two-part plastic body containing an internal flow passage. The parts of the body may snap together or attach with an adhesive. A transducer or an electronic sensor is typically located within the flow passage, which may measure mass flow rate and may have two resistive thermal devices (RTDs) located on either side of a heat source. The body may have two elongated port tubes configured to attach to tubing. The port tubes may contain venturis, and may be substantially straight and substantially parallel, forming a U shape. A metal lead frame may be provided in electrical communication with the sensor. The lead frame may be integrally molded within the body, and may have a lower coefficient of thermal expansion than the body. The internal flow passage and the sensor may be substantially symmetrical and measure the flow rate of the fluid substantially equally in either flow direction. The system may be configured for surface mounting or for through-hole mounting, and may be a dual in-line type. ol link to move relative to the respective bat axis to cause pivotal movement of the respective bat about the bat axis and thus, for each of the positions, to move the fingers of the bat around the bat axis to a required orientation relative to an axial plane of the reel axis passing through the bat axis; the cam track and the control links being arranged such that the cam track is located wholly radially inwardly of the bat circle; the bats at said one end of the reel extending longitudinally of the reel from an axial position spaced away from said one end toward said one end to a position such that an endmost finger of each of the bats lies in a radial plane of the reel axis which is at least in line with the cam track at said one end. 2. The header according to claim 1 wherein the radial plane of the endmost fingers is aligned with the cam. 3. The header according to claim 1 wherein the header frame structure includes an end sheet lying in a vertical plane at right angles to the cutter bar so as to lie along the direction of working movement and wherein the endmost fingers are arranged immediately adjacent the end sheet. 4. The header according to claim 1 wherein the reel is carried on at least two mounting arms of the header frame structure mounted on the header frame structure for upward and downward movement relative to the cutter bar, wherein the cam track is mounted with the reel for upward and downward movement with the mounting arms and wherein the cam track is mounted with the reel on the mounting arms so as to maintain the cam track accurately in a radial plane of the reel axis as the reel axis moves with the mounting arms. 5. The header according to claim 1 wherein each bat has associated therewith a crank attached to the bat and having an outer end spaced outwardly of the bat axis for effecting pivotal movement of the bat about the bat axis, wherein the respective control link of each bat has one end freely pivotally connected to the outer end of the crank and wherein each control link has associated therewith a respective link member for communicating rotation of the reel to the control link such that the cam follower thereof is caused to move along the cam track at a predetermined position therein. 6. The header according to claim 5 wherein the link member comprises a pivotal link which has one end pivotally connected to the reel at a fixed position thereon and a second end pivotally connected to the control link. 7. The header according to claim 6 wherein said one end is angularly advanced of the second end so that the link pulls the control link and the follower along the track. 8. The header according to claim 5 wherein the crank of each bat is adjustable relative to its associated control link to change the angle of the fingers of the bat around the bat axis, so as to adjust, for each of the positions, the respective orientation of said fingers relative to said axial plane. 9. The header according to claim 1 wherein each bat is adjustable relative to its associated control link to change the angle of the fingers of the bat around the bat axis, so as to adjust, for each of the positions, the respective orientation of said fingers relative to said axial plane. 10. The header according to claim 1 wherein the cam member is mounted for rotational adjustment movement of the stationary angular location thereof around the reel axis. 11. The header according to claim 10 wherein the reel is carried on at least two mounting arms of the header frame structure mounted on the header frame structure for upward and downward movement relative to the cutter bar, wherein the cam track is mounted with the reel for upward and downward movement with the mounting arms, wherein the cam track is mounted on a member fixed relative to the reel axis so as to maintain the cam track accurately in a radial plane of the reel axis as the reel axis moves with the mounting arms and wherein the cam track is mounted for rotational adjustme