Bruker SmartCooler BCU I, Руководство пользователя

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Introduction
Z33119_2_003 13
3 Introduction
3.1 SmartCooler BCU I
The SmartCooler
TM
BCU I is the successor model of the BCU05. The lowest temperature of
the cooled VT gas is with a BCU I is below -40 °C up to 50 Nl/min. The SmartCooler
TM
BCU I
and also the BCU05 produce the cooling energy via one compressor refrigerator with
electrical power. This SmartCooler
TM
is recommended for NMR experiments with a sample
temperature T
S
between 0 °C and T
RT
. For easier reading, this cooling system is often
referred to as BCU I in this manual.
Figure 3.1: SmartCooler BCU I
The BCU I is available with a transfer line length of 2 m, 3 m, 5 m or 8 m. The magnet type
defines which BCU I has to be ordered. Below is a list of the relative BCU I transfer line
lengths associated with the most common magnets (other magnets on request).
• 2 m: 400 US PLUS/R SB (Nitrogen free Z107439); all Ascend
TM
(all frequencies!); all
USplus SB LH; all USplus SB ULH; all US SB ULH; 300 – 500 US SB LH; 300 & 400 US
WB LH; USplus WB LH; 92137 (500/54/AS Magnex); 91843 (500/52 Magnex); 40797
(500/51 AS Oxford); 47410 (AS500/54)
• 3 m: 600 & 700 US SB LH; 500 US WB LH, 800 & 850 US2 Plus SB (Compact)
• 5 m: 600 US WB LH; 800 US SB; 900 US SB; Z29704 (600/52 LL); 800 – 950 US2 SB;
Z29715 (500/52LL); M10910 (900 MHz/54 US2); 29563 (750/52 Magnex); O019
(500/52LL), O048 (400/54 Oxford)
• 8 m: 1000 US SB
For BRUKER magnets the following rules are valid to determine the minimal transfer line
length of a BCU I:
• Ascend
TM
(all frequencies) and all other magnets ≤ 700 MHz: Place the BCU I outside the
0.5 T (5 G) line and not less than 1m from the axis of the magnet.
• Magnets ≥ 750 MHz: Place the BCU I outside the 5 mT (50 G) line and not less than 2.7 m
from the axis of the magnet.
Below is shown a possible 400 MHz magnet system with room temperature (RT) probe and a
VT gas cooling option with SmartCooler
TM
BCU I.