Utility Requirements
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8.3.2 Gas Supply
The gas supply used depends on the frequency of the system:
• 200-400 MHz: Compressed air
• 500 MHz: Nitrogen gas with >95% purity.
• 600-800 MHz: Nitrogen gas with >96% purity.
Notes:
• A nitrogen separator (offered by Bruker as an option) can be built into the spectrometer
cabinet as an available solution. This will produce the nitrogen gas required for VT work.
However, this is not suitable for larger flow rates required by MAS experiments.
The nitrogen separator is suitable for use with the BCU-I cooling unit. However the nitro-
gen output from the separator is not pure enough and this unit should not be used with a
N2 exchanger or BCU-II cooling unit for low temperature work.
• If a CryoCooling unit (CCU) is to be installed, a secondary regulator, T-split from the sup-
ply line is recommended.
• The Emergency Sample Protection Device is used in conjunction with the CryoProbe sys-
tem, and requires a cylinder of air or nitrogen gas.
System Operating Pressure Recommended Average
Flow*
AVANCE NEO + VT Unit 6-8 bar (80-120 psi) 57 Nl/min. (~2 cfm)
AVANCE NEO + Sample
Changer**
6-8 bar (80-120 psi) 100 NI/min. (~3.6 cfm)
AVANCE NEO + MAS 6-8 bar (80-120 psi) 300 Nl/min. (~11 cfm)
* This is the actual consumption and minimum needed at the instrument input after the
N2 supply (either a bulk tank, or a N2 separator). The sample lift to exchange a sample
needs for about 1 minute 100 l/min. For a standard NMR systems we expect 3...5 sam-
ple exchanges (which are included in recommended flow).
** A recommended flow of 100 liters/min. per sample for sample exchange (about 1
minute), average consumption will depend on the number of samples being used. Typi-
cal number of sample exchanges is up to 12 per hour (which is included in the recom-
mended average flow).
For non-MAS work, if an air-compressor and N2 separator are used, the flow require-
ments are 100% higher, i.e. minimum 4 cfm. It is recommended to use a dual unit oil-less
air-compressor rated at minimum double capacity of the specified requirement. Please
refer to the next section on air compressors.
Table8.2: Pressure and Flow Requirements
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