ISA RP67.04 PT2 : 1994

1 Scope
2 Purpose
3 Definitions
4 Using this recommended practice
5 Preparation for determining instrument channel
      setpoints
      5.1 Diagramming instrument channel layout
      5.2 Identifying design parameters and sources of
             uncertainty
6 Calculating instrument channel uncertainties
      6.1 Uncertainty equations
      6.2 Uncertainty data
      6.3 Calculating total channel uncertainty
7 Establishment of setpoints
      7.1 Setpoint relationships
      7.2 Trip setpoint determination
      7.3 Allowable value
8 Other considerations
      8.1 Correction for setpoints with a single side of
             interest
9 Interfaces
10 Documentation
11 References
      11.1 References used in text
      11.2 Informative references
Appendix A: Glossary
Appendix B: Vessel/reference leg temperature effects on
             differential pressure transmitters used for
             level measurement
Appendix C: Effects on flow measurement accuracy
Appendix D: Insulation resistance effects
Appendix E: Plant specific as found/as left data
Appendix F: Line pressure loss/head pressure effects
Appendix G: RTD accuracy confirmation
Appendix H: Uncertainties associated with digital signal
             processing
Appendix I: Recommendations for inclusion of instrument
             uncertainties during normal operation in the
             allowable value determination
Appendix J: Discussions concerning statistical analysis
Appendix K: Propagation of uncertainty through signal
             conditioning modules
Appendix L: Example of uncertainty/setpoint calculations
             1 - Example calculation - Pressure trip
             2 - Example calculation - Flow trip
             3 - Example calculation - Level trip
             4 - Example calculation - Radiation trip