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Chromatographic Symptoms
3
Troubleshooting and Maintenance Guide
69
Air Leaks
Air leaks are a problem for any instrument that requires a
vacuum to operate. Leaks are generally caused by vacuum seals
that are damaged or not fastened correctly. Symptoms of leaks
include:
•
Higher than normal analyzer chamber pressure or foreline
pressure
•
Higher than normal background
•
Peaks characteristic of air (
m/z
18, 28, 32, and 44 or
m/z
14
and 16)
•
Poor sensitivity
•
Low relative abundance of
m/z
502 (this varies with the tune
program used)
Leaks can occur in either the GC or the MSD. The most likely
point for an air leak is a seal you recently opened.
In the GC, most leaks occur in:
•
GC inlet septum
•
GC inlet column nut
•
Broken or cracked capillary column
Leaks can occur in many more places in the MSD:
•
GC/MSD interface column nut
•
Side plate O-ring (all the way around)
•
Vent valve O-ring
•
Calibration valve
•
GC/MSD interface O-ring (where the interface attaches to
the analyzer chamber)
•
Front and rear end plate O-rings
•
Turbo pump O-ring
Содержание 5975T LTM GC/MSD
Страница 1: ...Agilent Technologies Agilent 5975T LTM GC MSD Troubleshooting and Maintenance Guide...
Страница 10: ...10 Troubleshooting and Maintenance Guide...
Страница 32: ...32 Troubleshooting and Maintenance Guide 2 Concepts and General Tasks...
Страница 72: ...72 Troubleshooting and Maintenance Guide 3 Chromatographic Symptoms...
Страница 86: ...86 Troubleshooting and Maintenance Guide 5 ALS Symptoms...
Страница 98: ...98 Troubleshooting and Maintenance Guide 7 Instrument Power On and Communication Symptoms...
Страница 108: ...108 Troubleshooting and Maintenance Guide 9 Troubleshooting Tasks...
Страница 150: ...150 Troubleshooting and Maintenance Guide 10 General Maintenance Figure 16 Replacing filaments Filament 1 Filament 2...
Страница 166: ...166 Troubleshooting and Maintenance Guide 10 General Maintenance...
Страница 214: ...214 Troubleshooting and Maintenance Guide 13 Analyzer...
Страница 239: ...Parts 15 Troubleshooting and Maintenance Guide 239 Figure 39 LCP replacement parts LCP assembly and fascia...