Corrosion measurement with secondary temperature compensation

摘要

An electrical resistance type corrosion measuring probe has a test element exposed to a corrosive environment and an adjacent reference element protected from the environment. Electrical circuitry is connected to the elements for measurement of resistance ratio. This provides a corrosion output signal having a first order of temperature correction provided by the reference element. Secondary temperature compensation for dynamic or short term variation of temperature of the corrosive environment is provided by thermocouple measurement of temperatures of the test and reference elements and compensating the corrosion signal in accordance with the directly measured short term temperature difference of the elements.