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Sensor system with monitoring device

  • US 6,625,527 B1
  • Filed: 12/11/2001
  • Issued: 09/23/2003
  • Est. Priority Date: 02/18/1999
  • Status: Expired due to Fees
First Claim
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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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