Patent ID: 7295944

Claim:
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 monitoring 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, said plurality of instruments including at least one redundant instrument, said plurality of measured process values including a plurality of temperature measurements obtained during isothermal conditions, wherein said process step of loading a data set includes selecting a file, loading a set of resistance temperature device (RTD) data, calculating RTD averages from said set of RTD data, loading a set of thermocouple data, calculating thermocouple averages from said set of thermocouple data, and matching timeslices, selecting for analysis a set of data from said data set, removing a set of deviating data from said set of data, analyzing a set of remaining data for cross-calibration, and recalibrating any one of said plurality of instruments that produce at least one data point in said set of deviating data.