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Title: Sonic Meter Regulator Systems Operational( Experience)
Author: R. A. Price
Source: American Gas Association 1977
Year Published: 1977
Abstract: In 1975, Southern California Gas Company made the decision to purchase and test a unique new combination flowmeter-pressure regulator. This device utilizes a 10-bit digital control valve with sonic flow nozzles installed on each bit (Figure I). The nozzles are sizes in binary progression with the smallest being .1% of capacity, the next larger .2%, the next .4%, etc, and the largest being 50% of capacity. Upstream and downstream pressures and temperatures are sensed with precision transducers, and these signals transmitted to a microprocessor (Figure 2). which is the heart, or more precisely, the brain of the whole device.

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