Method and system for testing the accuracy of a thermocouple probe used to measure the temperature of molten steel
First Claim
1. A method for testing the accuracy of a temperature probe exposed to a medium having a temperature of between about 2200°
- F. and 3400°
F., comprising the steps ofmeasuring the rate of change of the temperature readings of the probe after a temperature of at least 2000°
F. is read,comparing the measured rate of change with a standard rate of change obtained from a properly operating probe, anddeclaring the temperature probe to be inaccurate whenever the rate of change deviates significantly from the standard rate of change.
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Abstract
A method and system for testing the accuracy of a thermocouple probe exposed to a medium having a temperature of between about 2200° F. and 3400° F. is provided that includes the step of measuring the rate of change of the temperature readings of the probe after a temperature of at least 2000° F. is read, and comparing the measured rate of change with a standard rate of change obtained from a properly operating probe. Both the method and the system are advantageously capable of determining whether the temperature readings of a thermocouple in use in a steel production plant are accurate without the need for comparative readings from other thermocouple probes.
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Citations
20 Claims
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1. A method for testing the accuracy of a temperature probe exposed to a medium having a temperature of between about 2200°
- F. and 3400°
F., comprising the steps ofmeasuring the rate of change of the temperature readings of the probe after a temperature of at least 2000°
F. is read,comparing the measured rate of change with a standard rate of change obtained from a properly operating probe, and declaring the temperature probe to be inaccurate whenever the rate of change deviates significantly from the standard rate of change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- F. and 3400°
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11. A method for testing the accuracy of a thermocouple probe exposed to liquid metal having a temperature of between about 2200°
- F. and 3400°
F., comprising the steps of;measuring the rate of change of the temperature readings of the probe after a temperature of at least 2000°
F. is read, andcomparing the measured rate of change with a standard rate of change obtained from a properly operating probe. - View Dependent Claims (12, 13, 14, 15)
- F. and 3400°
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16. A system for testing the accuracy of a temperature probe exposed to a medium having a temperature of between about 2200°
- F. and 3400°
F., comprising;a temperature probe, and means for measuring the rate of change of temperature readings of the probe after said probe reads a temperature of at least 2000°
F.;comparing the measured rate of change with a standard rate of change obtained from a properly operating probe, wherein the rate of change is determined by periodically computing a value of τ
from the following expression;
space="preserve" listing-type="equation">τ
=t/(ln((T.sub.1 -T.sub.0)/(T.sub.1 -T)))where T equals the temperature displayed by the probe t seconds after displaying a temperature of T0 when immersed in a medium of a temperature T1 ; and declaring the temperature probe to be inaccurate whenever the rate of change deviates significantly from the standard rate of change. - View Dependent Claims (17, 18, 19, 20)
- F. and 3400°
Specification