| 摘要 |
The device automatically computes the efficiency of the vaccum cleaner, speeds up the computation time, and accurately calculates the data. The device comprises an orifice box(14), which has an orifice plate contactor(11), a sample holder(12),a monometer connector(13), a circular orifice plate(15), an orifice plate driving device(16), a monometer(17), a vaccum pressure meter(18), temperature meters(19,20), a CPU(21) which automatically computes the efficiency of orifice, a terminal box(27) and a voltage regulator(28).
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