The pump must be installed so that only minimal quantities of dust can depo-
sit themselves on the surfaces. In those cases where dust deposits form,
measures must be introduced to remove these a regular basis.
The pumps must only be operated at an ambient temperature ranging bet-
ween 10 °C and 40 °C.
The maximum gas admission temperature must not exceed 100 °C.
The maximum overpressure at the gas inlet must not exceed p
amb
+ 55 mbar.
The maximum exhaust back pressure must not exceed p
amb
+ 200 mbar.
Safety Measures
Hot Surfaces
Compression of the gases will during normal operation of the vacuum pump
cause it to heat up resulting in hot surfaces. Tests have shown that during
conforming operation of the pump (in accordance with these Operating
Instructions) the process gas path which might come into contact with a
potentially explosive atmosphere, attains during operation at a nominal fre-
quency of 50 Hz or 60 Hz a maximum temperature below 160 °C.
The maximum temperatures are attained during constant operation at an inlet
pressure below 300 mbar (absolute). The actually attained temperature
depends on the inlet pressure.
Hot Gases
Due to compression of the gases, the pump will produce during normal ope-
ration hot exhaust gases. The exhaust gas temperatures will not exceed the
stated maximum surface temperatures of the pump. The exhaust gases need
to be discharged through a suitable exhaust gas system.
Mechanical Sparks
During normal operation no mechanically generated sparks are created.
The intake of particles into the pump must be prevented so as to prevent the
formation of hot spots due to friction.
Electric Sparks
These can be caused by the electric motor and the accessories supplied
with the pump. Where the outside of the pump has been certified then motor
and supplied accessories have the same classification. Follow the
manufacturer’s information.
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