page 33 of 57
The diaphragms and valves will be damaged, if liquids are
pumped in significant amounts.
Check the pump regularly for external soiling and depos-
its. Clean the pump if necessary to avoid an increase of
the pump’s operating temperature.
In case of overload, the motor is shut down by a
self-hold
thermal circuit breaker
in the winding.
Note
: Only a manual reset is possible. Switch off the
pump and disconnect the electrical power cord. Identify
and eliminate the cause of failure. Wait approximately five
minutes before restarting the pump.
•
Note
: In case of
supply voltage below 100V
, the lock
of the breaker may not latch and the pump might restart
on its own after sufficient cooling. Take appropriate pre
-
cautions, if an automatic restart of the pump may lead
to a dangerous situation.
A warm up period (approximately 15 min.) is required to en-
sure that the rated ultimate vacuum and pumping speed are
attained. Avoid overheating (e.g., due to hot process gases).
Important notes regarding the use of gas ballast
Gas ballast is a continuous purge to keep the pump’s in-
terior as clean as possible and to reduce the possibility of
condensation inside the pump.
➨
Air and pumped media might react inside the pump or
at the outlet of the pump and form hazardous or explo-
sive mixtures, when you use air rather than inert gas
for the gas ballast. This constitutes a risk of significant
damage to equipment and/or facilities, a risk of person-
al injury or even loss of life.
+
Make sure that air/gas intake through the gas ballast
valve can never lead to hazardous, explosive or other-
wise dangerous mixtures. If in doubt, use inert gas.
NOTICE
