VACUUBRAND PC 600 LAN NT User Manual

Page 33

page 33 of 102

To reduce pump noise emanating from the pump exhaust

The VACUUBRAND VNC 2 controller can only be operat-

ed with components compatible with the VACUUBRAND

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-

vacuum connection at controller

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