VACUUBRAND CVC 3000 E - Manual (Page 27)

page 27 of 75
Notes on connecting and operating the controller
Valves and/or vacuum pumps are necessary to operate the control-
ler.
Without those components the controller can be used only as vacuum
measurement device.
When used as measurement device, the controller can switch a possibly
connected coolant valve.
The CVC 3000 E is equipped with an internal capacitive pressure trans-
ducer with ceramic diaphragm. It measures the actual pressure indepen-
dently of the gas type, and with reference to the vacuum, i.e., absolute.
➨
Connect the vacuum connection of the controller via PTFE tubing to
the vacuum application and to the vacuum pump.
+
Maximum permissible pressure: 21.8 psi (1.5 bar) ab-
solute.
Attention: At pressures above approximately 795 Torr
(1060 mbar) the pressure reading becomes incorrect
due to saturation of the pressure transducer. The dis-
play flashes. Release pressure immediately! Risk of
bursting!
- Position the CVC 3000 E controller and its
vacuum line in such a way that condensate
cannot flow towards the pressure transduc-
er. Condensate and deposits will affect the
measurement results. Clean the pressure
transducer, if necessary. See section “Clean-
ing the pressure transducer”, pg. 55.
- 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 application itself. This affects the measurement
results as well as the control levels. Therefore, carefully choose the
position where to connect the pressure transducer.
- If residues occur or when working with aggressive or condensable
substances, install a gas washing bottle in front of the pressure trans-
ducer.
vacuum
connection
to application