US 4,047,100 A · Meter for measuring syrup ratio in soft drinks and the like

Abstract

Method and apparatus for measuring the conductivity ratio of a sample for determining deviation from a standard and particularly suited for use in measuring the syrup to water ratio in soft drinks and the like. A pair of conductivity cells for receiving the standard and sample, with the cells connected in a bridge circuit operated at relatively high frequency and having a full wave recitifier at the bridge output providing an input to an operational amplifier for driving an indicating meter which can be read in percent deviation from the standard. A side by side cell mounting with electrodes in the lower cell sections and a metal heat exchanger forming the upper cell sections. A pair of plungers for insertion into the cells for equalizing the amounts of material in the cells and the temperature of the materials. A calibration procedure for adapting the instrument for use with various products.

Claims12

Dependent claims

In an instrument for measuring the conductivity ratio of two liquids, the combination of:

first and second elongate conductivity cells of substantially equal volume mounted in said instrument side-by-side with their axes substantially parallel,
each of said cells having an upper portion with an open end and a lower portion with a closed end and having spaced electrodes in the lower portion for providing an electrical path through a liquid in the cell,
with said upper portions of said cells formed of a single metal member and with said lower portions of each of said cells including upper and lower electrodes in the form of annular bands and an insulating tube between said bands, with said tube and bands having a flush inner surface;
means for introducing a liquid into each of said cells;
means for connecting said cells in a bridge circuit;
an ac power source connected as an input to said bridge circuit;
and
indicator means for indicating the output of said bridge circuit.

5 more elements

Dependencies are inferred from the claim text.

Meter for measuring syrup ratio in soft drinks and the like

Life of this patent

Meter for measuring syrup ratio in soft drinks and the like

Life of this patent

Abstract

Claims12