Which instrument is commonly used to measure corrosion potential in cathodic protection?

The instrument commonly used to measure corrosion potential in cathodic protection systems is a voltmeter. This device measures the electrical potential difference between two points, typically the structure being evaluated and a reference electrode in the surrounding environment. The corrosion potential is crucial for assessing the effectiveness of a cathodic protection system, as it indicates the likelihood of corrosion occurring on the metallic surfaces.

A voltmeter is specifically designed to measure potential differences and can provide accurate readings necessary to determine the levels of corrosion risk. Understanding these measurements helps in the adjustment and maintenance of cathodic protection systems to ensure they are effectively preventing corrosion. The importance of monitoring corrosion potential cannot be overstated, as it directly influences safety and longevity in various industries, particularly those involving pipelines, tanks, and other metal structures exposed to corrosive environments.

Other instruments like an amperometer or a multimeter may be used in different contexts within cathodic protection systems, but they are not primarily intended for the measurement of corrosion potential. A galvanometer, while capable of detecting small currents, also does not focus specifically on potential measurements like a voltmeter does. Thus, the voltmeter is the most appropriate choice for this specific purpose in cathodic protection applications.