| 摘要 |
An apparatus (10) for sampling the emission content of an exhaust gas from an exhaust source (12) has an exhaust inlet (20) adapted for connecting the exhaust source (12) with a venturi metering device (30) for measuring the flow rate of the exhaust gas. The venturi metering device (30) includes a housing (32) having an entrance section (34), a throat section (36), and an exit section (38), the throat section (36) having a smaller diameter than the entrance and exit sections (34 and 38). The housing (32) includes first and second pressure transducers (PT1 and PT2) that produce an electrical output that characterizes the pressure measured, the electrical outlet enabling a computer (50) of the venturi metering device (30) to accurately measure the pulsating flow of the exhaust gas in both directions.
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