VACUUBRAND RP 35C VARIO - Manual (Page 6)

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.: 999019 / 22/12/2009
page 6 of 29
The pumps are not suitable for pumping substances which may form deposits inside
the pump.
☞ If there is a danger of the formation of deposits in the pump chamber (check inlet
and outlet of the pump) inspect the pump chamber regularly and clean if necessary.
The pumps are not suitable to pump unstable substances and substances which
react explosively under impact (mechanical stress) and/or when being exposed to
elevated temperatures without air.
The pumps are not suitable to pump self inflammable substances, substances which
are inflammable without air and explosive substances.
The pumps are not suitable for pumping dust and have no approval for operation
below ground.
Ensure that the materials of the wetted parts are compatible with the pumped
substances, see section ”Technical data”.
☞ If residues can occur or if aggressive or condensable substances may enter the
product, install suitable protection (e.g. gas washing bottle).
☞ Adopt suitable measures to prevent the release of dangerous, explosive, corrosive
or polluting fluids.
☞ Use inert gas for gas ballast or venting if necessary.
☞ The user must take suitable precautions to prevent any formation of explosive
mixtures in the expansion chamber. In case of a diaphragm crack, mechanically
generated sparks, hot surfaces or static electricity may ignite these mixtures.
☞ Take adequate precautions to protect people from the effects of dangerous sub-
stances (chemicals, thermal decomposition products of fluoroelastomers), wear
appropriate safety-clothing and safety glasses.
☞ Comply with applicable regulations when disposing of chemicals. Take into consid-
eration that chemicals may be polluted.
Always allow the pump to continue to run for a few minutes with the inlet closed or with
little gas ballast.
Adopt suitable measures to prevent any danger arising from potentially explosive or
flammable mixtures.
☞ Use inert gas for venting the equipment.
☞ As regards root pumps, the rotors rotate with a minimum clearance and at high
speed relatively to each other as well as along the housing. The clearance can
become smaller because of the thermal expansion due to compression heat. There-
fore, the pumping unit RP 12C must not be operated continuously at inlet pressures
> 50 mbar.
Due to the residual leak rate of the equipment, there may be an exchange of gas,
albeit very small, between the environment and the vacuum system.
☞ Adopt suitable measures to prevent contamination of the pumped substances or
the environment.
Avoid overpressure at the gas ballast valve in case of high inlet pressure due to the
high compression ratio.
☞ Pumped gases or collected condensate may leak in case the valve is open.
☞ Ensure that the inlet pipeline does not become contaminated when using inert gas.
☞ Avoid high heat supply (e. g. due to hot process gases).
☞ Pay attention to the max. permitted ambient temperature and make sure ventilation
is adequate especially if the equipment is installed in a housing.
In case of excess temperature, the motor of the diaphragm pump respectively the
motor of the Roots pump is shut down by a self-hold thermal cutout in the winding.