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Troubleshooting and Maintenance Guide
12
Vacuum System
Calibration Valve and Vent Valve
Calibration valve
A calibration valve (
) is an electromechanical valve
with a vial to hold the tuning compound. When a calibration
valve is opened, tuning compound in the vial diffuses into the
ion source. The valve is controlled by the MSD ChemStation.
EI calibration valve
The EI calibration valve is held onto the top of the analyzer
chamber by two screws. A small O-ring provides a face seal.
Perfluorotributylamine (PFTBA) is the most commonly used
tuning compound for EI operation. PFTBA is required for
automatic tuning of the MSD. Other compounds can be used for
manual tuning.
Vent valve
The vent valve knob (
) screws into a threaded port in
the front of the calibration valve. An O-ring is compressed
between the knob and the valve to form a seal. The threaded end
of the knob has an air passage inside it, allowing air to flow into
the manifold when the knob is partially unscrewed. If you turn
the knob too far, the O-ring can come out of its slot.
Figure 28
Calibration valve
EI calibration valve
EI calibration vial
Vent valve knob
EI CALIBRATION
above analyzer window
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...