| 摘要 |
A flowmeter comprising a four-way valve which directs fluid against one side or the other of a piston, while the other side of the piston is connected to an outlet line. The piston is connected to a permanent magnet which moves through an elongated winding to generate an output voltage related to the piston velocity which, in turn, is related to volumetric flow rate. The four-way valve is cycled to automatically reverse piston movement before the piston reaches one end of its full motion by an auxiliary valve which is operated from magnetic reed switches disposed along the path of movement of the permanent magnet. A readout and control circuit is provided which can present the velocity measurement on a digital display, with the circuit also providing calibration capability.
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