ISA-RP67.04.02:2010

This recommended practice provides guidance for the implementation of ANSI/ISA-67.04.01-2006 in the following areas:a) Methodologies, including sample equations to calculate total channel uncertainty;b) Common assumptions and practices in instrument uncertainty calculations;c) Equations for estimating uncertainties for commonly used analog and digital modules;d) Methods to determine the impact of commonly encountered effects on instrument uncertainty;e) Application of instrument channel uncertainty in setpoint determination;f) Sources and interpretation of data for uncertainty calculations;g) Discussion of the interface between setpoint determination and plant operating procedures,calibration procedures, and accident analysis;h) Documentation requirements.