Specifications
5-3
5.2.3 Electrical specifications
Parameter
200/230 Volt
60 Hz Model
440/480 Volt
60 Hz Model
200 Volt
50 Hz Model
380/415 Volt
50 Hz Model
Nominal
voltage
200/230 VAC 440/480 VAC 200 VAC 380/415 VAC
Operating
voltage
range
180 - 253 VAC 396 - 528 VAC 180 - 220 VAC 342 - 456 VAC
Frequency 60 Hz 60 Hz 50 Hz 50 Hz
Phase 3 3 3 3
Mains
supply
voltage
fluctuations
Up to ± 10% of the
nominal voltage
Up to ± 10% of the
nominal voltage
Up to ± 10% of the
nominal voltage
Up to ± 10% of the
nominal voltage
Input Power
See Appendix A
Current
Dedicated
circuit
breaker
5.2.4 Operating parameters
Parameter Value
Ambient temperature range*
45 to 100°F 7 to 38°C
System helium pressure
230 ± 5 PSIG @ 60 Hz
(15.86 ± .34 bar @ 60 Hz)
17.93 ± .34 bar @ 50 Hz
(260 ± 5 PSIG @ 50 Hz)
Acceptable location Indoors only Indoors only
Maximum altitude for use 6560 ft 2000 m
Environment Pollution Degree 2 Pollution Degree 2
Installation Category II Category II
Maximum relative humidity
80% for T< 88°F
Decreasing linearly to 50%
at 104°F.
80% for T< 31°C
Decreasing linearly to 50%
at 40°C.
Maximum sound level 70 dBA at 1 meter 70 dBA at 1 meter
*The helium compressor package is designed to operate in an ambient temperature range
from 45F to 100F (7 to 38C). If the temperature is below 45F, increased viscosity of the
oil could prevent start-up and/or cause poor lubrication. Operation above 100F will cause
overheating and subsequent problems. If a unit must be subjected to either extreme, consult
Cryomech, Inc.
5.2.5 Safety devices
A number of safety switches and valves are located inside the compressor package and
on the cold head. They operate automatically, to protect the compressor package and
cold head from developing extreme conditions that can cause damage. Most of them are
totally transparent to the user and are monitored by the compressor control panel - see
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