Cc Technologies Laboratories, Inc.

Cc Technologies Systems, Inc.

Kurt M Lawson

Neil G Thompson

Dan L Caudill

An automated coupon monitor for detecting the electrical parameters associated with a pipe, a coupon and a reference electrode utilized with a cathodic protection system. A voltage detector circuit has its output applied to a pair of sample and hold circuits, one for recording E.sub.OFF and the other for recording E.sub.ON. Series connected between the coupon and the pipe is a zero resistance current detector circuit and an interrupter switch for measuring the pipe-coupon current and periodically interrupting that current to permit measurement, sampling and storing of E.sub.OFF. The sample and hold circuits and the interrupter switch are controlled by a microprocessor controller. The circuit provides DC level outputs which can be easily read by a digital multimeter or stored in a data logger for subsequent reading or transmission to another location.

Coupon monitor for cathodic protection system

A test station for measuring the effectiveness of cathodic protection including a cylindrical plastic reference tube extending downwardly through the soil to near the protected structure, such as a pipe. Two plastic coupon tubes extend within the chamber of the reference tube attaching to opposite sides of its interior sidewalls. First and second circular cylindrical rod-shaped coupons attach to, and sealingly engage, the bottom ends of the coupon tubes. Insulated conductors extend from attachment to each coupon upwardly through the coupon tubes. A first coupon is electrically connected to the pipe, and the second coupon is used to measure a free-corrosion (native) potential.

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Sugar Grove, OH, United States of America

Kurt M Lawson