BUCHI Nano Spray Dryer B-90 - Manual (Page 57)

5 Putting into operation
57 B-90 Operation Manual, Version B
5.8.1 Main device installation
During the process, a constant inert gas flow (N
2
or CO
2
) is fed into the gas loop to refresh the used
drying gas. This constant gas feeding requires an exhaust gas output to balance the pressure inside
the gas circuit, thereforee the Inert Loop B-295 is equiped with a hose connection for the exhaust gas
at its right side. The use of inert gas requires additional safety measures. The upgrade set for the Inert
Loop B-295 (order no. 051783) is required to work in ‘closed loop’ operation with Nano Spray Dryer
B-90 Advanced. The set includes a back pressure check valve, hose connectors and compressed gas
tubing for CO
2
and N
2
.
c
b
a
a Communication cable to the Nano Spray Dryer B-90
Advanced (see section 4.10; socket c)
b Oxygen concentration display window
c Solvent condensate collector
The Inert Loop B-295 has transport wheels mounted
and can be placed next to a fume hood, near the Nano
Spray Dryer B-90 Advanced in the lab.
The communication cable a is part of the oxygen
safety loop. When the oxygen content reaches 6 % the
spray drying will be interrupted and an error message
will be displayed at the Nano Spray Dryer B-90
Advanced.
d e f
d Gas outlet towards gas inlet of the Aspirator (see
section 5.5.2)
e Gas inlet connected to the gas outlet of the Nano
Spray Dryer B-90 Advanced
f Exhaust gas outlet towards check valve g
g
g Check valve with exhaust gas tube
(to connection f )