Figure 48–63. This purge operates well
while the machine is in operation but may not be of much use
if the machine were to need service and is pressured to atmosphere
using nitrogen. This machine manufacturer offers
an optional motorized purge for removal of large amounts of
noncondensables.
The motorized purge is essentially a two-stage vacuum
pump that removes a sample of whatever gas is in the absorber
and pumps it to the atmosphere. These vapors are not
harmful to the atmosphere. Because the absorber operates in
such a low vacuum, this gas sample would contain only noncondensables
or water vapor,