Table of Contents
vi
Chapter Three: Overview ............................................................................................................ 31
General Information ........................................................................................................ 31
Pressure Control Range ..................................................................................... 31
A Typical Control System ................................................................................. 32
How The 640B Series Pressure Controller Works .......................................................... 33
Tuning the 640B Series Pressure Controller ................................................................... 34
Proportional Term .............................................................................................. 34
Integral Term ..................................................................................................... 35
Tuning the 640B Controller ............................................................................... 36
Priority of Commands ..................................................................................................... 38
Trip Points....................................................................................................................... 39
Action of the Trip Points ................................................................................... 39
Applications with a Large Differential Pressure ............................................................. 40
Labels .............................................................................................................................. 40
Chapter Four: Operation ............................................................................................................. 41
How To Check the Zero .................................................................................................. 41
How To Zero a Type 640B (Absolute) Unit ...................................................... 41
How To Zero a Type 641 (Gage) Unit ............................................................... 42
How to Adjust the Span .................................................................................................. 43
How To Tune the 640B Series Controller ...................................................................... 43
How to Adjust the Trip Point Values .............................................................................. 44
How to Select the Trip Point Action ............................................................................... 45
How To Use Trip Points as Error Indicators................................................................... 47
How To Change the Pressure Output Signal Range ....................................................... 48
How to Select Upstream Control .................................................................................... 49
Appendix A: Product Specifications ........................................................................................... 51
Performance Specifications ............................................................................................ 51
Environmental Specifications ......................................................................................... 52
Trip Point Specifications ................................................................................................ 52
Physical Specifications ................................................................................................... 53
Appendix B: Valve Orifice Selection ......................................................................................... 55
General Information ........................................................................................................ 55
Checking the Orifice Size .................................................................................. 55
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