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Utility Requirements
64 H157655_1_008
8.3.4.3 Filters
Micro-filters must be fitted as the last element in the supply line. For specification see the
section
Other Specifications [ } 60] .
Absorption dryers are prone to oil contamination and as such the input must be fitted with a
oil filter (oil < 0.01 mg/m
3
99.9% removal efficiency). To protect the dryers, regardless of type,
you are advised to install a water filter and an oil filter between the compressor and the dryer.
Adsorption dryers may generate dust and may need extra dust filters at the output.
The output of refrigeration dryers must be fed through a carbon activated filter.
Water filters must be fitted with automatic water drains as opposed to manual drains. The use
of valve switched drains is strongly recommended. Floater switched drains have a tendency
to become jammed and hence require regular maintenance.
If you are particularly concerned about oil contamination in the air supply then you must
consider using a submicron filter followed by an activated charcoal filter as this combination is
particularly effective in removing oil.
8.4 Cooling Water
The Ascend Aeon magnet system is equipped with a pulse tube cooler and a helium
compressor, which requires cooling water to remove up to approximately 10 kW of dissipated
heat.
Bruker recommends the installation of a dedicated cooling water loop serving the helium
compressor. This may be achieved by using either a refrigerated indoor or outdoor chiller, or
a water-water heat exchanger depending on the specific conditions and utilities available at
the customer site.
It is strongly recommended to provide emergency backup cooling water to the helium
compressor in case of failure of the main cooling water source. A secondary chiller or/and
domestic city water may be used as emergency backup. It is recommended to have an
automatic switch from the main cooling water source to the emergency backup water source.
It is also essential that the chillers are connected to backup power from the emergency
generator.
There are specific requirements for the cooling water parameters in order to maintain the
optimal operation of the helium compressor. These include water temperature, flow, and
pressure differential. The acceptable ranges for these water parameters and also for the
water quality are listed in the dedicated manual for the helium compressor.
Please contact
Bruker for the respective specifications concerning the cooling water requirements.
If the system is equipped with the CryoProbe option and the compressor is water cooled,
then cooling water is also needed to remove the ca. 7.5 kW of heat output from the water-
cooled type helium compressor used in conjunction with the CryoProbe. The cooling water
requirements for the CryoProbe system are found in the chapter
Helium Compressor - Indoor
Water Cooled [ } 86] .
When the magnet is equipped with a BNL and the water-cooled option, then cooling water is
needed to remove the ca. 2.5 kW of heat output from the water-cooled type helium
compressor.