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Title: New And Improved Instruments For Corrosion And Cathodic Protection Testing
Author: m. C. Miller
Source: American Gas Association 1972
Year Published: 1972
Abstract: New developments in electronic instruments- now available-will help reduce costs of corrosion control of underground metallic structures, pipe lines, cables, etc. There has long been a need for simple, easy-to-use but accurate and rugged meters for taking structure-to-earlh potentials and current flow measurements- meters suitable for use by nontechnical employees, but suitable also for the highly trained engineers and laboratory technicians. Basic direct-current meters were greatly improved about 10 years ago when the taut-band suspension instruments became available--thereby eliminating the pivots, jewels and delicate hair springs which were a source of trouble and failures. Taut-band suspension provides better accuracy, improved ruggedness, and higher sensitivity. But the sensitivity was still far too low to eliminate inaccurate structure-to-earth potential readings-errors which can be very cosily. Also, even with this taut-band .suspension, these high-sensitivity instruments were still not as rugged as desired.

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