Purging with Gaseous Nitrogen
The UltraDoser unit must only be purged with gaseous nitrogen. Chart recommends the UltraDoser unit
be purged when not in use. However, this may not be practical for all operators. At a minimum, the
UltraDoser unit should be purged to eliminate any water that may be inside the unit after installation and
prior to startup. The UltraDoser reservoir may also require purging when there is liquid nitrogen flowing
out of the vent. The UltraDoser reservoir must also be purged when the nozzle becomes frozen shut.
See page 47 for Dura-Cyl dewar fed systems or page 50 for bulk tank (house fed) systems for additional
information.
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