| 摘要 |
PCT No. PCT/SE83/00155 Sec. 371 Date Nov. 29, 1983 Sec. 102(e) Date Nov. 29, 1983 PCT Filed Apr. 22, 1983 PCT Pub. No. WO83/03896 PCT Pub. Date Nov. 10, 1983.A measurement unit for determining gas flow through a conduit by means of measuring pressure differential over an orifice arranged in the conduit (1), and to a measuring means designed to be included in such measurement unit. The purpose of the invention is to achieve a measurement unit and a measuring means which produce reliable readings and are of simple construction. This is achieved by means of an orifice centrally arranged in a section of the conduit (1) made as a flat circular disc (2) perpendicular to the central axis of said section. Round pressure measurement boxes (3) are arranged close to the sides of the disc. The inner chambers (13) of the boxes communicate with the space close to the disc and immediately outside the lateral wall (11) of the box via aperture means (10) between the lateral wall edge portion adjacent to the disc and the surface of the disc. The pressure chamber (13) inside each box defined by the box and the surface of the disc, is in communication with a pressure differential meter outside the conduit section via a flexible pressure differential meter outside the conduit section via a flexible pressure lead-out hose (8) coupled between a pressure lead-through nipple (7) in the wall of the box (3) and the meter. The diameter of the disc is at least 50% of the inner diameter of the conduit section (1) and the outer diameter of the box is at most 60% of the diameter of the disc.
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