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During each cycle, an amount
of liquid is displaced equal to the difference
in the volumes of the chambers minus the volumes
of the pistons.
This process repeats itself in
a continuous flow mode at the rates of 1 to 210
complete cycles per second proportionately to
the fluid flow through the meter. In the FMTD4
Microflowmeter, each cycle displaces approximately
.02 cc. Approximately 200,000 cycles will displace
one gallon. The FMTD20 Microflowmeter has a flow
rate capacity five times larger than the FMTD4.
Signal detection is accomplished
by light interruptions of a photo emitter/detector
device. A ferromagnetic wire tracks the magnet
in the nutator [through a pressure tight barrier]
causing these interruptions. The interruptions
are electronically manifested as sine waves which
are then conditioned by conventional electronic
means to provide a square wave output.
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