Alcatel Drytel 100 Instruction Manual page 13

3.7 - GAS BALLAST (OPTION)
The gas ballast allows to inject occasionally air or nitrogen.during pumping to improve light gas, pumping,
and avoid the particles contamination.
The opening of the gas ballast causes the flushing of the light molecules by the heavy molecules (air or
nitrogen) in the roughing line.
The gas ballast flow rate adjusted at 60 SCCM automatically calibrated for a pressure of 1 000 mbar.
1 - Manual gas ballast option: when the control button is screwed, the gas ballast is closed.
2 - Automatic gas ballast option : it is equip p ed with a 24 V. solenoid valve. This valve can be connected
to a neutral gas pipe (connection G 1 /8" female) by the customer.
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