Contents
iv
Chapter 9 Maintaining the Instrument
Common Replacement Parts and Consumables ................................................85
Fuse Locations ........................................................................................................88
Changing the Sampling Needle ..............................................................................89
Changing the Sample Loop .....................................................................................92
Steam Cleaning the Pneumatic System .................................................................95
Installing the Transfer Line onto the Volatiles Interface ....................................96
Aligning the Vial Loader (G1289/G1290 only) ......................................................97
Adjusting the potentiometers .........................................................................97
Procedure ..........................................................................................................99
Other vial handling adjustments ..................................................................101
Checking carousel adjustment .............................................................................101
Leak Testing: General Information ......................................................................103
Leak Testing a G1289 to 6890 GC Interface ........................................................105
Carrier Gas Flow Path ...................................................................................105
Carrier Flow Path Pressurization Test ........................................................107
Vial Pressurization Gas (Aux) Flow Path ...................................................108
Leak Testing a G1290/G1883 to GC Interface .....................................................110
Prepare the Sampler ......................................................................................110
Carrier Gas Flow Path ...................................................................................110
Vial Pressurization Flowpath .......................................................................111
Flow Testing the Vent Valve and Associated Flow Path ..................................112
Tightening the PTV Septumless Head Using the Leak Test Procedure ..........113
Chapter 10 Troubleshooting
Chromatography Problems ..................................................................................116
No Peaks .........................................................................................................116
Bad Data (Bad Peaks) ...................................................................................117
Unwanted Peaks Present ..............................................................................119
Vial Handling Problems (G1289/G1290 only) .....................................................119
Gripper Arm Doesn’t Pick Up Sample Vial .................................................119
Sample Vial Doesn’t Drop Down Into Oven ...............................................120
Vial Not Raised and Lowered in Oven .........................................................121
Vial Not Loaded/Vial Retained Warning ......................................................121