Method and system to validate wired sensors
First Claim
1. A system, for use in a safety shutdown system in an industrial facility, the system for validating at least one wired sensor measuring at least one variable comprising:
- (a) at least one wireless sensor for measuring the at least one variable as an at least one wireless sensor measurement, the at least one wireless sensor having built-in computer-executable instructions for self-checking and self-diagnostics;
(b) at least one wired receiver, operatively coupled to the at least one wired sensor, to receive at least one wired sensor measurement from the at least one wired sensor;
(c) at least one wireless receiver, operatively coupled to the at least one wireless sensor to receive the at least one wireless sensor measurement from the at least one wireless sensor; and
(d) a validation computer, operatively coupled to the at least one wired receiver and the at least one wireless receiver, to compare the at least one wired sensor measurement and the at least one wireless sensor measurement to an expected value, such that if at least one measurement is unacceptable, an alert is generated;
wherein the at least one wired sensor measurement is transmitted to a monitoring device that is independent of the validation computer;
wherein the at least one wireless sensor transmits a message to the at least one wireless receiver whenever an abnormality is detected when the computer-executable instructions are executed;
wherein the at least one wired sensor measurement of the at least one variable is a trip variable used by the monitoring device in a shutdown logic of the safety shutdown system for the industrial facility; and
wherein the at least one wireless sensor has a different measurement mechanism than the at least one wired sensor so as to increase reliability of the safety shutdown system through sensor diversity.
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Accused Products
Abstract
The present invention provides a method and system using wireless sensors to validate wired sensors used in applications where the requirements on the reliability of wired sensors are stringent. A computing means periodically collects measurements for each variable from the wired and wireless sensors and compares them against an expected value. The expected value is a weighted average of all the measurements for a variable, in which the weight assigned to the measurement from each sensor is determined according to both its reliability and accuracy. As such, measurements are compared with the corresponding expected value for a particular variable. If the difference between a measurement and its corresponding expected value is found to be unacceptable, the validation computer will generate a corresponding alert. Application examples include 1) validating wired sensors used in safety shutdown systems for industrial facilities and 2) validating wired sensors used to monitor storage tanks.
29 Citations
15 Claims
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1. A system, for use in a safety shutdown system in an industrial facility, the system for validating at least one wired sensor measuring at least one variable comprising:
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(a) at least one wireless sensor for measuring the at least one variable as an at least one wireless sensor measurement, the at least one wireless sensor having built-in computer-executable instructions for self-checking and self-diagnostics; (b) at least one wired receiver, operatively coupled to the at least one wired sensor, to receive at least one wired sensor measurement from the at least one wired sensor; (c) at least one wireless receiver, operatively coupled to the at least one wireless sensor to receive the at least one wireless sensor measurement from the at least one wireless sensor; and (d) a validation computer, operatively coupled to the at least one wired receiver and the at least one wireless receiver, to compare the at least one wired sensor measurement and the at least one wireless sensor measurement to an expected value, such that if at least one measurement is unacceptable, an alert is generated; wherein the at least one wired sensor measurement is transmitted to a monitoring device that is independent of the validation computer; wherein the at least one wireless sensor transmits a message to the at least one wireless receiver whenever an abnormality is detected when the computer-executable instructions are executed; wherein the at least one wired sensor measurement of the at least one variable is a trip variable used by the monitoring device in a shutdown logic of the safety shutdown system for the industrial facility; and wherein the at least one wireless sensor has a different measurement mechanism than the at least one wired sensor so as to increase reliability of the safety shutdown system through sensor diversity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, for use in a safety shutdown system in an industrial facility, the method for validating at least one wired sensor measuring at least one variable comprising steps of:
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(a) using at least one wireless sensor having built-in computer-executable instructions for self-checking and self-diagnostics, and the at least one wired sensor to collect measurements from the at least one variable; (b) calculating a weighted average of all of the measurements taken in step (a) as an expected value; (c) comparing at least one measurement to the expected value; (d) determining whether a difference between the at least one measurement and the expected value is unacceptable; (e) in the event that the difference between the at least one measurement and the expected value is unacceptable, an alert is generated and the method returning to step (a); and (f) in the event that the difference between the at least one measurement and the expected value is acceptable, returning to step (a); wherein measurements from the at least one variable collected by the at least one wired sensor is transmitted to a monitoring device that is independent of a validation computer performing steps b), c), and d); and wherein measurements from the at least one variable collected by the at least one wired sensor is a trip variable used by the monitoring device in a shutdown logic of the safety shutdown system for the industrial facility; wherein the at least one wireless sensor transmits a message to the at least one wireless receiver whenever an abnormality is detected when the computer-executable instructions are executed; and wherein the at least one wireless sensor has a different measurement mechanism than the at least one wired sensor so as to increase reliability of the safety shutdown system through sensor diversity.
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Specification