The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1978
Filed:
Nov. 20, 1975
Roger M Hawk, Mentor, OH (US);
Thomas A Mitchell, Painesville, OH (US);
Diamond Shamrock Corporation, Cleveland, OH (US);
Abstract
An apparatus and process for measuring the percent concentration of an electrolyte in solution is disclosed. The apparatus includes a crystal oscillator generating a square wave and a wave shaper to transform the wave into a monochromatic sine wave which passes through a two stage temperature compensated first buffer amplifier. The sine wave passes between electrodes which project into the solution under investigation and generates an output. A second buffer amplifier operates on the A.C. component of the output from the solution and is operatively connected to a half wave rectifier. The output of the half wave rectifier is proportional to the percent caustic. A temperature control device is utilized to hold the solution at a constant temperature. An alternate embodiment utilizes two identical circuits with two different solutions. One circuit is used with a solution having a known concentration and one with an unknown concentration. The outputs are compared in a differential amplifier. The process of this disclosure includes generating a square wave, converting the square wave to a monochromatic sine wave and amplifying the wave. The process further includes passing the monochromatic sine wave through a solution of an unknown concentration at a known temperature by means of electrodes projecting into the solution, removing any D.C. components, amplifying the output and converting it to a direct voltage repesenting the average of the A.C. wave. The magnitude of the output is then compared to a standard curve to note the concentration. Alternately, the monochromatic sine wave may be split and passed through a solution of unknown concentration to a solution of known concentration. The difference of the electrical outputs is taken and compared to calibration curves to determine the concentration.