INFICON Composer Gas Concentration Controller - Manual (Page 13)

TOC - 3
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Composer Operating Manual
Chapter 3
Applications Guide
3.1 Advice and Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 What is the Required Warm Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2 When and How Often to Set the Reference Zero . . . . . . . . . . . . . . . . . . 3-1
3.1.3 How is Performance Affected if I Use the
Factory Set Reference Zero Value? . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4 What To Do when the Specific Heat Ratio
for a Gas is Unknown? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.5 What is the Ideal Operating Environment? . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.6 What is the Effect of Pressure Variation? . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.1.7 Should Sweep or Amplitude Track
Mode Be Used? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.1.8 What is the Effect of Flow Variation? . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.1.9 How Does This Instrumental Method Differ from
Measuring the Speed Of Sound by Time Of Flight . . . . . . . . . . . . . . . . . 3-6
3.1.9.1 Calculation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.1.10 What is the Long Term Stability of
this Measurement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.1.11 Properties of Optional O-ring Materials . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.1.12 What Happens if the Reference Zero
is Improperly Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.1.13 Composer Bulk Flow Control Configuration . . . . . . . . . . . . . . . . . . . . . 3-11
3.1.13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.1.13.2 Sensor Installation (Bulk Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.1.13.3 Controller Installation (Bulk Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.1.13.4 Operation (Bulk Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.1.13.5 Programming the Controller’s Parameters (Bulk Flow) . . . . . . . . . . . . 3-16
3.1.13.5.1 List of Parameters used for Describing the
Bulk Flow Control Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3.1.13.6 Determining Process Control Loop Parameters (Bulk Flow) . . . . . . . . 3-18
3.1.13.6.1 Gain, Kp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.1.13.6.2 Dead Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.1.13.6.3 Time Constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.1.14 Analog I/O Option — Concentration Control Configuration . . . . . . . . . 3-19
3.1.15 How to Sample Flow with a Composer . . . . . . . . . . . . . . . . . . . . . . . . 3-20
3.2 Tutorials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
3.2.1 Control Loop Fundamentals — Concentration Control . . . . . . . . . . . . . 3-21
3.2.1.1 Tuning a Slow Delivery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
3.2.1.2 Tuning a Fast Delivery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23