Advanced User Guide 3
Contents
1 Introduction
About This Manual 8
The Keypad 9
Headspace Analysis 11
Headspace techniques 11
Static headspace sampling techniques 12
2 How the 7697A Headspace Sampler Works
How the HS Processes a Sample Vial 16
How the HS Equilibrates a Vial 18
How the HS Pressurizes a Vial 19
Fill at flow to pressure 19
Fill to pressure 19
Fill with constant volume 20
Dynamic leak check 20
How the HS Fills the Sample Loop (Extracts a Sample) 21
Default loop fill mode 21
Custom loop fill mode 21
Types of HS Extractions and Injections 22
Standard extraction 23
Multiple headspace extractions 24
Concentrated headspace extractions 24
Venting residual vial pressure 25
How the HS Reduces Carryover 26
3 Method Development
Overview 28
Consider the Sample and Matrix 29
Theory of headspace analysis 29
Impact of K and phase ratio 30
Consider the GC Inlet 33
Load a Similar Method 34
Edit the New Method 35
Temperatures 35
Times 36
Vial 37
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