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How Desiccant Air Drying System Works
2 309921N
How Desiccant Air Drying System Works
When air is compressed, the temperature of the air
increases, as does its capacity to hold moisture. As the
hot, moist air travels down through the lines, it cools,
allowing the moisture to condense. Filters, drain traps,
and driplegs only remove liquid condensation. The
Dryaire Desiccant Air Drying System removes liquid
condensation, residual water vapor and aerosols.
As the wet compressed air flows through the inlet port
and down the bed of desiccant, the desiccant beads
absorb the water vapor and aerosols and can reduce
the air humidity down to a -40°F (-40°C) pressure dew
point.
After the moisture has been removed, the dry air passes
through an element, up the center tube, and out the out-
let port. As long as the desiccant is replaced at satura-
tion point and your compressed air is not exposed to a
temperature below the dew point, your equipment will
receive dry, moisture-free air.
As the desiccant becomes saturated with moisture, the
dew point begins to rise. This is evident when the desic-
cant changes color from blue to pink, indicating the need
for desiccant replacement. Refer to Desiccant Change-
out, page 9.
WET AIR
IN
DRY AIR
OUT
Quick-remove
flange
Built-in screen
prevents desiccant
from going down tube
when refilled
288810 Blue silica gel
desiccant beads turn
pink when saturated.
Element prevents any
desiccant dust from
traveling downstream
Built-in sight glass allows
easy monitoring of desiccant
color change