| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the maintenance control on the state of corrosion protection of a cathodically protected underground buried pipe, or the like. SOLUTION: This measuring instrument 1 or the state of cathodic protection has a processing circuit 10, a display 11, a signal generator 12, a potential/ current measuring instrument 13, a printer 15, and the like, these being integrated in an enclosure 2, and can perform examination of the state of corrosion protection, judgment of insulation performance, and the like. The insulation performance of an insulation flange part 22 between the underground buried pipe 20 and an indoor pipe 21 can be examined by impressing a low-frequency exciting signal generated by the signal generator 12 on surfaces of the pipe 20 and on the pipe 21, separately, via two contacts 8, 9, and measuring by a magnetometric sensor 3 a magnetic field set up by an exciting current. To judge whether the state of cathodic protection is good or bad, the protective potential of the surface of the pipe 20 is measured by using the measuring instrument 13 or a protective current supplied from an Mg positive electrode etc., used for corrosion protection is measured. Results of the measurement and results of the insulation performance judgment can be printed and outputted from the printer 15.
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