| 摘要 |
A sampling device for isokinetic sampling of a flowable substance passing through a conduit comprises a plurality of relatively narrow tubes (27) of substantially equal length each open at one end and terminating in a metering valve (30) at the other end. The tubes (27) are sealed within an externally smooth sheath (28) and the open ends protrude different distances from the sheath, substantially along a straight line parallel to the axis of the sheath (28). The end portions of the tubes (27) are parallel to each other and perpendicular to the sheath's axis so as to be substantially parallel to the axis of the conduit, when disposed for use. The open ends of the tubes (27) are substantially in a common plane perpendicular to the lengths of the end portions. The other ends of the tubes are connected to the metering valves which are calibratable for isokinetic sampling by means of calibration indicators (31), and the metering valves (30) are each connected to discharge valves (32) which are ganged together so as to be opened and shut simultaneously by the movement of a hinged operating bar (37). When the metering valves (30) are correctly set, movement of the operating bar (37) enables flowable substance to pass isokinetically through respective tubes (27) and discharge valves (32) when the latter are opened to provide a corresponding number of simultaneous isokinetic samples of flowable substance. A sample homogenization device (FIG. 7) provides for mixing of collected samples (usually about 1 liter samples) prior to laboratory analysis.
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