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 13 of 29
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The frequency is reduced at high inlet pressures (especially at atmospheric pres-
sure) in order to avoid thermal overload of the roots pump.
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Under normal conditions, the maximum pump speed is reached only at inlet pres-
sures < 50 mbar.
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The noise level can be different when evacuating.
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The pump achieves its pumping speed, ultimate total vacuum and vapour pumping
rate only at operating temperature (after approx. 60 minutes).
In case of
oil in the separator:
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The shaft seal of the roots pump may leak.
Note:
Also if the shaft seal is not
damaged, a small amount of oil may enter the pump chamber of the roots pump.
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Not degassed lubrication oil may foam.
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May this be caused by an oblique position of the roots pumping unit?
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Oil consumption increases at inlet pressures above 100 mbar. Check oil level at
shorter intervals.
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Operate the pump without gas ballast only with clean systems and without conden-
sable vapours.
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Let the pump run with gas ballast to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump or to decontaminate the pump oil from
volatile substances. The manual gas ballast valve is open if the arrow on the gas
ballast cap points upwards (RP 12C and 15C VARIO) or away from the diaphragm
pump (RP 22C/35C VARIO).
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In case of pumping aggressive, corrosive or otherwise dangerous gases and va-
pours, take
appropriate measures
to protect pump and environment by using ap-
propriate equipment such as cold trap, separator, oil separator, full flow oil filter,
shut-off valve as well as special oil.
Shut down:
Has the pump been exposed to condensate?
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Allow the pump to continue to run at atmospheric pressure for a few minutes,
then with the inlet closed.
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Stop pumping unit and admit air.
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Drain condensate, if necessary.
Has the pump been exposed to media which may damage the pump materials or form
deposits
?
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Let the pump continue to run for a longer time with the gas ballast valve open,
check and clean pump heads if necessary.
Short-term:
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Wait at least 60 s before restarting the pumping unit (RP 15C/22C/35C VARIO
only).
Long-term:
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Separate pump from the apparatus.
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Flush pump with dry nitrogen.
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Change oil.
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Fill the pump with new oil (not above upper level line!).
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Close manual gas ballast valve.
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Close inlet and outlet port (e. g. with transport caps or blind flanges).
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Store the pump in dry conditions.
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If necessary carry out oil change and maintenance prior to use if the pump is stored
for a longer time.
