CryoProbe and Other Accessories
H157654_9_011 93 / 120
10.1 CryoCooling Unit
The CryoCooling Unit (CCU) is installed adjacent to the magnet outside the 50 Gauss (5 mT)
line. The shim cable must be 180º from the CryoProbe front plate. The shim stack may be ro-
tated if necessary.
Dimensions: Width: 73 cm
Depth: 74 cm
Height: 97 cm
Weight: 400 kg
Voltage:
Required external fuse up-
stream:
230 V AC +/- 10%, 1 phase, 50-60 Hz.
T 10 A (T = time-lag fuse)
Power consumption: Peak 0.8 kW
Average 0.5 kW
(systems produced before June 2005: peak power of
1.5 kW)
Acoustic noise: Maximum 61 dB(A) 2 meters distant
Maximum room ambient tem-
perature:
30°C. No operation above this temperature is ap-
proved.
Helium gas supply: A high purity helium (He) gas cylinder (6 N =
99.9999% or better, maximum impurity concentration 1
ppm).
Compressed air or nitrogen sup-
ply:
With a pressure of > or = to 4.5 bar.
Position: Outside 50 Gauss (5 mT) fringe field.
Table10.1: CryoCooling Unit Specifications
10.2 Helium Compressors
The next step in the site planning for a CryoProbe accessory involves determining the type
and location of the helium compressor. Since the helium compressor generates a consider-
able amount of heat (7.5 kW average, 8.5 kW peak), it must be cooled to prevent overheat-
ing. Bruker offers both water cooled and air cooled helium compressors. In either case, plac-
ing the compressor in a remote room (allowing He gas flex lines up to 20 m to reach the Cry-
oCooling unit) or an enclosure will keep the noise of the unit out of your laboratory. Outdoor
helium compressors may be sited at increased distances allowing He gas lines up to 40 m to
reach the CryoCooling Unit.
10.2.1 Available Models
Three models of helium compressors are currently available. All the compressors must be
sited outside the 5 Gauss (0.5 mT) line, generate the same amount of heat (7.5 kW average)
and have the same power requirements (3 Phase, 208 V). The correct helium compressor for
your laboratory may be determined based on the desired location for the unit (indoor, out-
door, and distance from the CryoCooling Unit) and the availability of a chilled water supply.
Helium transfer lines connect the helium compressor to the CryoCooling unit and are avail-
able in several different lengths as shown below.
To Next Page
Loading...
Need help?
General
