VACUUBRAND PC 3012 NT VARIO Duo User Manual

Page 48

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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:

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