Bruker BioSpin NMR BVT3200, Техническое руководство

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Technical Manual Version 002 BRUKER BIOSPIN 9 (55)
Gas flow circuit
Gas flow circuit 1.6
On the middle of the PC (printed circuit) a pressure regulator delivers gas at
constant pressure to a group of valves. Each valve, when open, let the gas flow
through a calibrated hole. As all valves are in parallel, it is possible to obtain 15
different gas flow rates.
The regulator is factory adjusted to obtain approximately 2000 l/h when all valves
are open.
The default value at power on can be changed by hardware jumpers (JP12 and
JP13) see figure
"Valve jumpers settings" on page 41 .
An optical gas flow sensor detects the presence of the gaz flow.
Figure 1.4. Gas flow circuit
Setting up the default gas flow 1.6.1
Connect the BVT3200 gas input to a dry air or a N
2
gas supply line. The inlet pres-
sure must be at least 4 bar and not exceed 7 bar. The default gas flow rate after
power on is defined according to the settings of jumpers JP12 and JP13 located
between the temperature controller and the valve block.
The gas flow rate may also be changed in the "EDTE" program on the
spectrometer.
When a jumper is placed it is read as "0" and the valve is CLOSED (no gas flow).
A missing jumper is interpreted as "1" and the valve is OPEN (gas flow).
•
V4 is the valve with the lowest throughput
•
V1 is the valve with the highest throughput
•
The factory setting for the default flow is 270 l/h
GAS
FLOW
SWITCH
CALIBRATED HOLE PRESSURE REGULATOR
GAS IN
VALVE CONTROL
VALVE
GAS OUT
VALVE BLOCK