| 摘要 |
An apparatus ( 1 ) is disclosed for monitoring the effect on a material of exposure to a fluid, and thereby monitoring the effect on a section of pipe ( 9 ) for carrying the fluid. The apparatus includes a sensor element ( 51 ) exposed to the fluid and formed as a ring of the material coaxially mounted within, but electrically insulated from, the section of pipe ( 9 ). Changes in the electrical resistance of the sensor element ( 51 ) are monitored. Preferably, the apparatus also includes a reference element ( 31 ) electrically insulated from the pipe ( 9 ), electrically connected in series to the sensor element ( 51 ) and protected from exposure to the fluid. The elements may both be made from the same material as the pipe ( 9 ) and, as they are contained within it, experience the same temperature and pressure variations as the pipe ( 9 ). In this manner a change in the resistance of the sensor element ( 51 ) caused by corrosion/erosion by the fluid accurately indicates the degree of corrosion/erosion of the pipe ( 9 ) carrying the fluid.
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