Bruker BioSpin NMR BVT3200, Technical Manual

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Technical Manual Version 002 BRUKER BIOSPIN 7 (55)
BVT3200 main components
BVT3200 main components 1.2
The interface board has a microcontroller for remote control of the BVT3200. Two
RS232 ports are available on this printed circuit. One port, on the front panel side,
is for the communication with host computer and the other for communication with
the Eurotherm 2416 temperature controller.
The power supply connector is at the rear side of the board. On the front, a gas
flow indicator with a steel ball detects the gas flow. A device, called valve block, is
a group of four valves which control the gas flow rate.
Parts location 1.3
Figure 1.2. Parts location (top view)
Principle of operation 1.4
The sample tube located in the magnet is heated by a constant gas flow delivered
by the BVT3200. A temperature sensor (e.g. a Thermocouple T) under the sam-
ple tube measures the gas temperature and the temperature controller compares
the actual temperature to the target temperature programmed by the operator. It
controls the power applied to the heater placed at the base of the magnet in order
to stabilise the gas temperature. A special gas flow switch monitors continuously
the gas flow in the BVT3200 and switches off the probe heater when the gas flow
is missing. A safety thermocouple measures also the heater temperature and
avoids probe overheating in case of missing gas flow in the probe.
Pressure regulator
Eurotherm Controller
Valve block
Location of
temperature
option board