Mass flowmeter starting system

Details Mass flowmeter starting system Mass flowmeter starting system

1975-11-25

1976-11-30

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

318171, G01F 182

Patent

active

039941655

ABSTRACT:
A Zener diode voltage sensing circuit senses when the 115 volt, 400 Hz primary power source to a conventional 8 Hz two-phase mass flowmeter is below approximately 80 volts and through an amplifier, a frequency halving flip-flop, and a quad NAND gate halves the frequency from 8 Hz to 4 Hz so that the impeller of the two-phase drive motor will start or continue rotating, then as the primary voltage rises above the 80 volt predetermined amount, and after approximately a one-second delay, the 4 Hz, two-phase drive frequency is changed to the normal two-phase 8 Hz impeller driver voltage.

REFERENCES:
patent: 2714310 (1955-08-01), Vennings
patent: 2852726 (1958-09-01), Ocnaschek
patent: 3276258 (1966-10-01), Rowley
patent: 3855510 (1974-12-01), Houck

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