INTRODUCTION
Helium Compressors, Models F-70H and F-70L
The compressors are designed to deliver high-pressure, oil-free, helium gas to cryogenic
refrigerators. Cold head cables are used with the compressor to supply electrical power to cold
heads. Self-sealing gas couplings allow for easy connection to and disconnection from the rest
of the closed-cycle cryogenic refrigeration system.
The information in this manual pertains only to the F-70H (high voltage model) and the F-70L
(low voltage model) Compressors. Other components used to form an operating system are
described in separate technical manuals.
Pressures are stated as gauge, not absolute. Pressure units are bar and pounds per square
inch (psig). For reference:
1 bar = 14.5 psig.
1 MPa = 10 bar
Definition of Symbols used in this manual and on equipment
Reference: F-70H and F-70L Helium Compressors Operating Manual, P/N 267055A.
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