2. SYSTEM OVERVIEW
Page 27 © 2005 DH Instruments, Inc.
2.3 VACUUM PUMPS
The ADCS-601 vacuum pumps are stand alone products for which separate Operation and
Maintenance manuals are available with much more complete information than is included in this
manual. A copy of the manual is provided on the ADCS-601 Support CD.
The ADCS-601 vacuum pumps are not included in an ADCS-601 system. They must be ordered
separately from DHI or from the original equipment manufacturer.
There are two vacuum sources in the ADCS-601 system.
- Utility vacuum source: The utility vacuum source provides vacuum to the pressure
controllers so that they can control pressure under atmospheric pressure. The utility vacuum
source is a dry, scroll pump that is normally located under the Reference Bench and has
single connection to the Control Cabinet rear panel.
- Reference vacuum source: The reference vacuum source provides vacuum to the
reference circuit of the PG7601 and FPG8601 pressure standards for operation in absolute
mode. The reference vacuum source consists of a roughing pump and a turbo molecular
pump. The roughing pump is a dry, scroll pump located under the Reference Bench. The
turbo molecular pump is mounted to the bottom surface of the Reference Bench and includes
a Controller mounted in a bracket under the Reference Bench.
See the original manufacturer Operation and Maintenance Manuals for additional information on the turbo
molecular pump and turbo pump controller.
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