Vacuum System 6
Troubleshooting and Maintenance Manual 105
Calibration Valves
A calibration valve (Figure 19 and Figure 20) 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 valves are
controlled by the MassHunter Workstation software.
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 MS.
Figure 19 EI calibration valve
EI calibration valve
EI calibration vial
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