VACUUBRAND PC 600 LAN NT User Manual
Page 33
page 33 of 102
To reduce pump noise emanating from the pump exhaust
port, connect an exhaust hose or use a silencer (see “Ac-
The VACUUBRAND VNC 2 controller can only be operat-
ed with components compatible with the VACUUBRAND
VACUU•BUS system, (see “Accessories”, pg. 74).
The VNC 2 vacuum controller controls VACUUBRAND di-
aphragm pumps NT and optional in-line, coolant, and vent-
ing valves. Connected components (e.g., venting valve,
level sensor, external pressure transducer VSK 3000) are
automatically identified and configurated.
Do not use more than one controller within the same
VACUU•BUS system. Several controllers in the same
VACUU•BUS system will interfere with each other and
result in error messages of the connected compo-
nents (pumps, valves).
VNC 2
The VNC 2 is equipped with an internal capacitive pres-
sure transducer with ceramic diaphragm. It measures the
actual pressure independently of the gas type, and with
reference to the vacuum, i.e., absolute.
Inside a vacuum system where evaporation
occurs, e.g., a rotary evaporator, the vacuum
is not uniform. For example, a condenser can
act as a pump, or the vacuum in the connecting
tubing can be higher or lower than in the ap-
plication itself. This affects the measurement
results as well as the control levels.
Therefore, carefully choose the position where to con-
nect an external (optional) gauge head. Position an op-
tional external gauge head and its vacuum line in such
a way that condensate cannot flow towards the pres-
sure transducer. Condensate and deposits will affect
the measurement results. Clean the pressure trans-
ducer, if necessary. See section “Cleaning the pres-
vacuum connection at controller