Sensor system with monitoring device
First Claim
1. Sensor system comprising:
- first and second redundant sensors for sensing a process reference variable or process measured variable of a process and generating first and second output signals, respectively, a monitoring device including a first subtractor for producing a first difference value between the first and second output signals, respectively, a first and a second differentiator for generating time derivative signals of the first and second output signals, respectively, a second subtractor for producing a second difference between the first and second time derivative signals a fault analysis device for comparing the first and the second difference with a respectively associated first and second threshold value, wherein at least one of said first or second threshold values is determined according to the following relation;
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Abstract
A sensor system with monitoring device wherein the sensor system includes at least two redundant sensors for gathering a process reference variable or process measured variable of a process, and in that the monitoring device includes a first subtractor for producing a first difference between the sensor output signals, a first and a second differentiator for the time derivative of the sensor output signals, a second subtractor for producing a second difference between the differentiated sensor output signals, and a fault analysis device by which the first and the second difference is respectively compared with a predeterminable first or second threshold value, and a fault message is produced when at least one of the differences exceeds the threshold value concerned.
52 Citations
5 Claims
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1. Sensor system comprising:
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first and second redundant sensors for sensing a process reference variable or process measured variable of a process and generating first and second output signals, respectively, a monitoring device including a first subtractor for producing a first difference value between the first and second output signals, respectively, a first and a second differentiator for generating time derivative signals of the first and second output signals, respectively, a second subtractor for producing a second difference between the first and second time derivative signals a fault analysis device for comparing the first and the second difference with a respectively associated first and second threshold value, wherein at least one of said first or second threshold values is determined according to the following relation;
- View Dependent Claims (2, 3, 4)
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5. Sensor system comprising:
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first and second redundant sensors for sensing a process reference variable or process measured variable of a process and generating first and second output signals, respectively, a monitoring device including a first subtractor for producing a first difference value between the first and second output signals, respectively, a first and a second differentiator for generating time derivative signals of the first and second output signals, respectively, a second subtractor for producing a second difference between the first and second time derivative signals a fault analysis device for comparing the first and the second difference with a respectively associated first and second threshold value, wherein at least one of said first or second threshold values is determined according to the following relation;
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Specification