Electrical resistance temperature compensated corrosion probe with independent temperature measurement
First Claim
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1. An electrical resistance corrosion and temperature probe comprising:
- a resistance test element adapted to be exposed to an environment of which corrosive characteristics are to be measured and having a test connection point,a resistance reference element protected from said environment and having a reference connection point and connected to said test element at a common connection point,a measuring circuit having first and second inputs respectively connected to said test and reference points and having a common input, anda temperature sensitive device connected between said common input and said common point, said temperature sensitive device being adapted to measure temperature at said probe.
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Abstract
An electrical resistance corrosion probe incorporates a temperature sensitive resistor (RTD) that directly measures temperature of the probe and therefore of its environment as corrosion measurements are being made. The temperature sensitive resistor has one end connected to the common junction between the test and reference elements of the corrosion probe and has its other end connected in the common line to the several corrosion measuring circuits, including the test, reference and check circuits.
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Citations
28 Claims
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1. An electrical resistance corrosion and temperature probe comprising:
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a resistance test element adapted to be exposed to an environment of which corrosive characteristics are to be measured and having a test connection point, a resistance reference element protected from said environment and having a reference connection point and connected to said test element at a common connection point, a measuring circuit having first and second inputs respectively connected to said test and reference points and having a common input, and a temperature sensitive device connected between said common input and said common point, said temperature sensitive device being adapted to measure temperature at said probe. - View Dependent Claims (2, 3, 4)
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5. An electrical resistance corrosion and temperature measuring probe comprising:
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test and reference elements connected to each other at a junction, said test element comprising a resistance test element adapted to be exposed to an environment of which corrosive characteristics are to be measured, said reference element being protected from said environment, test and reference leads connected respectively to said elements and a common lead connected to said junction, and a temperature sensitive resistor connected in said common lead, said temperature sensitive resistor being adapted to measure temperature at said probe. - View Dependent Claims (6, 7, 8)
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9. A corrosion and temperature measuring instrument comprising:
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a resistance test element adapted to be exposed to an environment of which corrosive characteristics are to be measured, a resistance reference element protected from said environment and mounted adjacent to and connected to said test element, resistance responsive means responsive to said test and reference elements for generating test and reference signals indicative of corrosion experienced by said test element, said means for generating test and reference signals comprising; first and second leads having said test element connected therebetween, a third lead, said reference element being connected between said second and third leads, and test and reference measuring circuits having inputs connected to said leads, and a temperature sensitive resistor mounted adjacent said test and reference elements and connected in said second lead, and means for measuring resistance of said resistor, said temperature sensitive resistor having a resistance that is a measure of temperature at said probe. - View Dependent Claims (10, 11, 12)
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13. A combined temperature and electrical resistance corrosion measuring instrument comprising:
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a test element adapted to be exposed to an environment of which corrosive characteristics are to be measured and having a test resistance, a reference element mounted adjacent said test element and protected from corrosion by said environment and having a reference resistance, said reference element being connected to said test element at a common point, a first measuring circuit connected between a point on said test element and said common point for measuring resistance of said test element, a second measuring circuit connected between a point on said reference element and said common point for measuring resistance of said reference element, a temperature sensitive resistor having a first end connected to said common point and having a second end, and a third measuring circuit connected to said second end of said temperature sensitive resistor and to one of said test and reference elements for measuring resistance of said temperature sensitive resistor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification