VACUUBRAND PC 620 - Manual (Page 16)

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.: 999029 / 01/10/2009
page 16 of 48
Max. permitted pressure at the controller: 1.5 bar (absolute).
☞ The display flashes at a pressure higher than 1300 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.
☞ 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.
vacuum
connection
at the controller
Attention: Important notes regarding the use of gas ballast
☞ Make sure that air/gas inlet through the gas ballast valve never lead to hazardous,
explosive or otherwise dangerous mixtures. If in doubt, use inert gas.
☞ When using air rather than inert gas, risk of significant damage to equipment and/or
facilities, risk of personal injury or even loss of life exists due to the formation of
hazardous and/or explosive mixtures if air and pumped media react inside or at the
outlet of the pump.
For condensable vapours (water vapour, solvents, ...):
☞ Do not pump vapour before pump has reached its operating
temperature and with gas ballast valve closed.
☞ Open gas ballast valve. (Closing of gas ballast valve by turn-
ing 180°.)
☞ The gas ballast valve is open if the arrow on the gas ballast
cap shows away from the pump.
☞ With gas ballast valve open ultimate vacuum will be reduced,
pumping speed is decreased.
☞ Use inert gas at the air inlet to avoid the formation of explo-
sive mixtures.
gas
ballast
In case of low boiling solvents when the formation of condensate is unlikely, the use of
gas ballast might be unnecessary.
☞ Operating the pump without gas ballast increases the solvent recovery rates at the
exhaust waste vapour condenser.
Attention: Notes concerning the operation of the exhaust waste vapour condenser
➨ Check hose connections prior to starting operation of the cooling system.
➨ Check coolant hoses regularly during operation.
☞ Ensure that the coolant outlet pipeline is always free and that it cannot get blocked.
☞ Maximum permissible coolant pressure at the exhaust waste vapour condenser:
6 bar (absolute)
☞ Comply with the maximum permissible coolant pressures of additional components
in the coolant circuit (e.g coolant valve).
☞ Avoid overpressure in the coolant circuit (e.g. caused by blocked or squeezed cool-
ant hoses).
☞ Permissible range of coolant temperature at the exhaust waste vapour condenser:
-15°C to +20°C
☞ The gas outlet (hose nozzle 10 mm) must not be blocked. The exhaust pipeline has
always to be free and pressureless to enable an unhindered discharge of gases.
➨ Check the overpressure safety relief device at the exhaust waste vapour condenser
regularly, replace if necessary. Check especially for sticking and cracks.
☞ Connect the exhaust to a suitable treatment plant to prevent the discharge of dan-
gerous gases and vapours to the surrounding atmosphere.