Introduction 1
5977B Series MSD Troubleshooting and Maintenance Manual 15
Physical description
The 5977B HES Series MSD housing is approximately 41 cm high, 30 cm wide,
and 54 cm deep. The weight is 39 kg for the diffusion pump models, and 46 kg
for the EI/CI turbo pump mainframe. The weight is 41 kg for the EI turbo
pump mainframe. The standard foreline (roughing) pump weighs an
additional 11 kg (standard pump), and the dry foreline pump weighs 16 kg.
The foreline pump is usually located on the floor behind the MSD.
The basic components of the instrument are the:
• Frame/cover assemblies
• Vacuum system
• GC interface
• Electronics
• Analyzer
Front Panel LED
The front panel LED allows the operator to monitor the MSD. The LED
displays the instrument status with color codes and patterns described in “GC
Control Panel, Power Switch, and Front Panel LED” on page 212.
Vacuum gauge
The 5977B HES Series MSD may be equipped with an ion vacuum gauge. The
Data Acquisition software can be used to read the pressure (high vacuum) in
the vacuum manifold.
The gauge is required for chemical ionization (CI) operation.
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