Patent ID: 7739067
Filing Date: 2010-06-15
Classification: G07C

Abstract:
1. An apparatus for automating cross calibrations of plant instruments, said apparatus comprising: a processor in communication with a data storage system, said data storage system being a part of a plant computer system, said processor programmed to execute a process including: loading a data set from said data storage system, said data set including a plurality of measured process values from a plurality of instruments, selecting for analysis a set of data from said data set, said set of data including a set of resistance temperature device (RTD) data and a set of thermocouple data, removing a set of deviating data from said set of data, and analyzing a set of remaining data for cross-calibration of said plurality of instruments, said process step of analyzing further including calculating a set of RTD deviations from said set of RTD data, calculating an average value and a standard deviation value from said set of RTD deviations, calculating a set of thermocouple deviations from said set of thermocouple data, and calculating an average of said set of thermocouple deviations.