VACUUBRAND PC 3012 NT VARIO Duo - Manual (Page 48)

page 42 of 145
Vacuum connection of the CVC 3000 vacuum controller
The CVC 3000 controller is equipped with an
internal capacitive pressure transducer with
ceramic diaphragm. It measures the actual
pressure independently of the gas type, and
with reference to the vacuum, i.e., absolute.
Connect the vacuum connection of the con-
troller (measurement connection at the rear of
the CVC 3000; hose nozzle for tubing I.D. 1/4”
/ 3/8” (6 / 10 mm) or connection for PTFE tube
I.D. 3/8”, O.D. 5/16” (10 / 8 mm)) via hose or
PTFE tubing to the vacuum application. The
cross-section of the tubing should be as large
as possible.
Inside a vacuum system where evaporation occurs, e.g.,
a rotary evaporator, the vacuum is not uniform. For ex-
ample, a condenser can act as a pump, or the vacuum in
the connecting tubing can be higher or lower than in the
application itself. This affects the measurement results as
well as the control levels. Therefore, carefully choose the
position where to connect the vacuum controller sensor.
vacuum
process
(1) (3) (2)
Replacing the hose nozzle at the CVC 3000 by a connection for PTFE
tube: