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Agilent Technologies 7694 User Manual
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Maint
aining
the
Inst
rumen
t
Changing the Sample Loop
93
Figure 20.
Remov
ing the m
anifold c
over
and insula
tion
3.
Use a 7-mm wrench t
o loosen the
two nuts connecting
the sample loo
p to
the six–po
rt valve. Se
e Figure
21.
Loos
en
Manifold cov
er
and insulation
(Front cover not
shown
for clarity.)
100
102
Table of Contents
Default Chapter
3
Table of Contents
3
Chapter 1 About this Manual
9
Manual Overview
10
Intended User
11
Conventions
11
Chapter 2 Introduction to Headspace and to the 7694 Headspace Sampler
13
Overview of Headspace Analysis
14
The 7694 Headspace Sampler
15
Oven (G1289/G1290)
15
Heated Zones (G1883)
16
Vial Tray (G1289/G1290)
17
Vial Transport Arm (G1289/G1290)
17
Sampling System
18
Transfer Line
18
Keypad and Display
18
Pneumatics
19
Principles of Operation
21
General Operation
21
Power on Diagnostics
22
Standby Condition
22
Vial Pressurization
23
Filling the Sample Loop
24
Loop Equilibration
25
Injecting the Sample
25
End of Cycle and Vial Recovery
26
Modes of Operation
27
Standard Headspace Extraction
27
Multiple Headspace Extraction with Multiple Vial Puncture-G1289/G1290 Only
29
Multiple Vial Puncture with Constant Heating Time-G1289/G1290 Only
30
Multiple Headspace Extraction with Single Vial Puncture
31
Multiple Headspace Extraction for Analyte Concentration-G1289/G1290 Only
31
Chapter 3 The Keypad
33
Accessing Functions
34
Editing Setpoints
34
The G1883 Keypad
34
The G1289/G1290 Keypad
36
Keys and Their Functions
38
Start (G1883 Only)
38
Stop/Reset (G1883 Only)
38
Start/Stop (G1289/G1290 Only)
38
Zone Temps
39
Event Times
40
Vial Parameters
42
Load Method
43
Store Method
43
Chain Methods
44
Link Methods
44
Carousel Advance (G1883 Only)
44
Pressure (G1883/G1290 Only)
44
Tray Advance (G1289/G1290 Only)
44
Enter
45
Clear
45
Numeric Keypad
45
Adv Fctn
45
Chapter 4 Using the Adv Fctn Key
47
Using an Advanced Function
48
List of Advanced Functions by Model
49
Advanced Function Descriptions
52
Chapter 5 Preparing a Sample
63
Sample Preparation
64
Loading the Sample Tray And/Or Carousel
66
Chapter 6 Entering a Method
68
Entering a Method
68
Entering Zone Temps
68
Setting Event Times
69
Setting Vial Parameters
71
Storing and Loading Methods
72
Storing a Method
72
Loading a Method
72
Chaining Methods
73
Activate a Method Chain
73
Deactivate a Method Chain
74
Using a Method Chain for MHE
74
Using a Method Chain for Running more than 44 Samples
74
Chapter 7 Developing Methods
77
Varying Oven Temperature
79
Varying Event Times
79
Vial Equilibration Time
79
Loop Fill Time
80
Matrix Effects
80
Changing the Sample Loop
81
Sample Size
81
Vial Pressurization and Time
81
Vial Pressurization
81
Vial Pressurization Time
82
Optimizing Carrier Gas Flow
82
Recommended 6890/6850 GC Liner
83
Chapter 8 Running a Sample
85
Setting Conditions
86
Flow Rates
86
Setting the Carrier Gas Flow Rate for the G1883/G1290
88
Setting the Vial Pressurization Gas Pressure for the G1883/G1290
89
Setting Carrier and Vial Pressurization Flows for the G1289
89
Chapter 9 Maintaining the Instrument
91
Common Replacement Parts and Consumables
93
Fuse Locations
96
Changing the Sampling Needle
97
Changing the Sample Loop
100
Steam Cleaning the Pneumatic System
103
Installing the Transfer Line Onto the Volatiles Interface
104
Aligning the Vial Loader (G1289/G1290 Only)
105
Adjusting the Potentiometers
105
Procedure
107
Other Vial Handling Adjustments
109
Checking Carousel Adjustment
109
Leak Testing: General Information
111
Leak Testing a G1289 to 6890 GC Interface
113
Carrier Gas Flow Path
113
Carrier Flow Path Pressurization Test
115
Vial Pressurization Gas (Aux) Flow Path
116
Leak Testing a G1290/G1883 to GC Interface
118
Prepare the Sampler
118
Carrier Gas Flow Path
118
Vial Pressurization Flowpath
119
Flow Testing the Vent Valve and Associated Flow Path
120
Tightening the PTV Septumless Head Using the Leak Test Procedure
121
Chapter 10 Troubleshooting
123
Chromatography Problems
124
No Peaks
124
Bad Data (Bad Peaks)
125
Unwanted Peaks Present
127
Vial Handling Problems (G1289/G1290 Only)
127
Gripper Arm Doesn't Pick up Sample Vial
127
Sample Vial Doesn't Drop down into Oven
128
Vial Not Raised and Lowered in Oven
129
Vial Not Loaded/Vial Retained Warning
129
Vial Jam Problems (G1289/G1290 Only)
129
Recovering from Vial Jam Problems
130
Mechanical/Electrical Problems
130
Instrument Resets Continuously
130
No Power
131
Oven Carousel Won't Rotate Properly
131
Oven Carousel Won't Agitate
131
Sample Tray Doesn't Stop at Correct Location (G1289/G1290 Only)
132
Sampling Sequence Won't Start
132
Second Method in Sequence Won't Start
133
Zones Won't Heat
133
Pressures Are Wrong
134
Chapter 11 Error Messages
135
Error Message Listing
136
Recovery from an Automation Error (G1289/G1290)
141
Glossary
143
Index
149
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Agilent Technologies 7694 Specifications
General
Brand
Agilent Technologies
Model
7694
Category
Laboratory Equipment
Language
English
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