GA05141_0702 - 09/2004
53
Installation
2.6 Connecting the purge gas
Please contact Leybold for assistance in making the decision as to which
media can be pumped with or without purge gas.
In processes which require purge gas the pump will have to be vented,
when it is switched off, through the purge gas port.
Suited are all gases,
■ which will not cause corrosion or pitting in aluminium and steel and
■ which in connection with process deposits in the pump will not cause
corrosion or sticking.
For venting and as the purge gas we recommend inert gases like nitrogen
or argon. The temperature of these gases should be between 5 °C and 80
°C , max. relative humidity should not exceed 10 ppm.
In individual cases and after consultation also dry, filtered, oil-free air or fil-
tered ambient air may be used (filter mesh < 1µm). In this case connect a
filter to the purge gas and venting valve; see Fig. 42
Change the filters after some time, at least annually.
Different venting methods are described in Chapter 3.1.
Monitor the purge gas supply continuously.
Insufficient purge gas flow can result in:
■ Process gases entering the motor and bearing area of the
MAG
■ Process gases escaping from the purge gas inlet
■ Humidity entering the pump.
Inadequate purge gas flow voids the warranty.
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