Bruker BVTE3900, Technical Manual

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Technical Manual Version 003 BRUKER 9 (41)
2
Description 2
Introduction 2.1
The BVTE3900 (P/N W1208962) is a cooling system for high temperature NMR
probes.
It works in conjunction with a temperature controller (BVT3000 or BVT2000) with
an «E» thermocouple input, and allows to work at high temperature (above
150 °C).
It can be used as well for standard or even low temperature.
The system has a cooling circuit, power electronics and safeties.
The cooling system comprises a cooling liquid tank and a circulating pump and
safeties to prevent probe overheating.
The power electronics is mainly composed by a power booster driven by the digit-
al temperature unit BVT3000.This unit is fully controlled by the driving unit tem-
perature unit. The power electronics provides the power to the heater according a
command signal issued by the BVT3000. When the BVTE3900 is connected to
the BVT3000 and switched on the power stage of the VTU is disabled.
The power booster is by-passed when used with BVT2000.
A special version of the BVTE3900 called BVTE3900 LTE (P/N : W1209799) is
available, see chapter "Option LTE" on page 31.
It is intended only for low temperature applications. This system avoids freezing of
the probe housing. It works with a BVT3000 or a BVT2000.
Description of the BVTE3900 2.2
Coolant circuit 2.2.1
A tank contains 5 litres of coolant. The circulating pump is on when the line switch
is on and the liquid level is correct in the tank. A flow sensor monitors continuously
the flow. The coolant coming back from probe is air-cooled by an heat exchanger
with fan.