INTRODUCTION
Helium Compressor Models HC-4A and HC-4A2 Zephyr
®
The compressors are single-stage, air-cooled, rotary, designed to deliver high-pressure, oil-free
helium gas to cryogenic refrigerators. Cold head cables are used to supply electrical power to
cryogenic cold heads. Self-sealing 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 HC-4A Zephyr
®
Series Compressors. Other
components used to form an operating system are described in separate technical manuals.
Pressures are stated as gauge, not absolute. Psig is pounds per square inch gauge and kPa is
Kilopascals gauge,
kPa = 6.895 x Psig.
Definition of Symbols used in this manual and on equipment:
Power Switch On
Protective Earth (Ground) Terminal
O
Power Switch Off
WARNING Risk of Electric Shock
CAUTION Refer to Manual
V ~
Volts, AC, 1 Phase
WARNING Cutting of Fingers or
Hand
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