MAX300-RTG : Hardware Manual Hardware Maintenance
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Figure 53: Valve Box Heater, high temperature T4 and T3 options
Corrosive Pump Option
In some applications, sample gases are corrosive. A corrosive pump option is
available, where the turbomolecular and rotary vane pumps are protected by
purging with a small continuous flow of an inert gas (nitrogen). This extends the
life of the pumps in these conditions. In addition, the rotary pump is filled with a
special corrosion resistant oil. Contact Extrel CMS Service for advice when
sampling corrosive gases.
The flow of nitrogen is limited by the purge devices mounted to the pumps. Extrel
recommends supplying nitrogen to the unit at 10 to 20 psig pressure. This results
in a total nitrogen flow of 13 to 28 sccm.
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