VACUUBRAND MZ 2C VARIO - Manual (Page 16)

page 16 of 51
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. manual-no.: 999034 / 22/04/2008
During operation:
Do not start pump if pressure difference between inlet and outlet port exceeds max.
1 bar. Attempts to start pump at higher difference may cause blockade and damage of
the motor.
☞ Check compatibility with max. permitted pressure at outlet and max. pressure
difference between inlet and outlet ports.
Due to the high compression ratio of the pumps, pressure at the outlet port might be
generated being higher than the max. permitted pressure compatible with the mechanical
stability of the system.
The pump achieves its pumping speed, ultimate total vacuum and vapour pumping
rate only at operating temperature (after approx. 15 minutes).
☞ Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amounts.
☞ Let the pump run with gas ballast to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump.
☞ Connect the exhaust to a suitable treatment plant to prevent the discharge of dan-
gerous gases and vapours to the surrounding atmosphere.
Before operation MZ 2C VARIO / MD 4C VARIO:
☞ Connect cable from the frequency converter of the pump to the controller (rear
side): trip line and power supply of the frequency converter.
Connect the cable of the gauge head to the female connector at
the rear side of the vacuum controller.
Connect the gauge head to the vacuum system by using a small
flange connection or a hose connection.
☞ The device is adjusted together with the gauge head at the
factory. If the gauge head is replaced a readjustment is rec-
ommended.
➨ Connect cable from the frequency converter of the pump to
the controller (rear side): trip line and power supply of the
frequency converter.
female connector
to connect gauge
head
VSK 5
Max. permitted pressure at the pressure transducer: 1.5 bar (ab-
solute).
☞ The display flashes at a pressure higher than 1100 mbar.
☞ Comply with max. permitted pressure.
☞ Inside a vacuum system where evaporation occurs, e. g.
rotary evaporator, the vacuum is not uniform, e. g. a con-
denser acts as pump or the vacuum in the pipeline is lower
than in the system. Therefore carefully choose position where
to connect the gauge head.
☞ Condensate and deposits in the pressure transducer affect the measuring result.
☞ In case of deposits, aggressive or condensable media, install a gas washing bottle
before the pressure transducer if necessary.
☞ In order to avoid malfunction it is important to position the pressure transducer in
the vacuum line so as to avoid flow of condensate towards the pressure transducer.
☞ Clean pressure transducer if necessary, see section “maintenance“.
☞ Preselections at the controller, see section “Modes“.
☞ Use and operation of the controller see section “How to operate the controller”.
☞ Setting of interface parameters, see section “Interface“.
gauge
head
VSK 5
Connecting the pressure gauge: