Table of Contents
iv
Chapter Three: Overview.......................................................................................................21
General Information ...................................................................................................21
Pressure Control Range..................................................................................21
Flow Range ...................................................................................................22
A Typical Control System..............................................................................22
How The 649 Pressure Controller Works....................................................................23
Flow Measurement Overview.....................................................................................24
Flow Path ......................................................................................................24
Measurement Technique................................................................................24
Tuning the 649 Pressure Controller ............................................................................25
Proportional Term..........................................................................................25
Integral Term.................................................................................................26
Tuning the 649 Controller..............................................................................27
Priority of Commands................................................................................................29
Trip Points .................................................................................................................30
Action of the Trip Points................................................................................30
Applications with a Large Differential Pressure..........................................................31
Labels ........................................................................................................................31
The Gas Correction Factor (GCF) for Flow Metering .................................................32
Chapter Four: Operation ........................................................................................................33
How To Check the Pressure Transducer Zero .............................................................33
How To Adjust the Pressure Transducer Span............................................................34
How To Zero the Integral Mass Flow Meter...............................................................35
How To Tune the 649 Controller................................................................................36
How To Adjust the Trip Point Values.........................................................................37
How To Select the Trip Point Action..........................................................................38
How To Use Trip Points as Error Indicators ...............................................................40
How To Change the Pressure Output Signal Range ....................................................41
Chapter Five: Maintenance ....................................................................................................43
General Information ...................................................................................................43
Zero Adjustment ........................................................................................................43
Appendix A: Product Specifications.......................................................................................45
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