Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1977-01-17
1978-05-30
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
134 57R, 331 65, 361178, G05D 1108
Patent
active
040918335
ABSTRACT:
A first inductive coil in the form of a bifilar winding is wound on a ferrite ring core with the two sections of the bifilar winding connected in series, the junction of the two sections forming the center tap of the coil. A capacitor is connected across the first coil to form a parallel resonant circuit therewith. The two ends of the first coil are respectively connected to a predetermined capacitance and to an electrode adapted to form a capacitative element whose dielectric includes a fluid under test. The center tap of the first coil is connected to the output of an amplifier whose input is connected to a second, detector coil comprising a separate winding on the ferrite ring core located substantially at the mid-point between the ends of the bifilar winding. The second coil is arranged to be inductively coupled to said first coil such that the mutual inductance between the first coil and the detector coil completes a feedback loop for the amplifier. Circuit components are included for producing an output signal dependent upon an oscillatory condition of the amplifier, the latter condition being arranged to be achieved upon the occurance of a predetermined foaming condition.
REFERENCES:
patent: 2490634 (1949-12-01), Keene
patent: 3397715 (1968-08-01), Fathauer
patent: 3483437 (1969-12-01), Coyne
patent: 3796925 (1974-03-01), Breeding
Ellis Christopher Ian Arthur
Naylor Edward Leonard
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