Adsorbent Breather Assembly0 pages

"

gl Donaldson.

nnnn

!SM FILTRATION SOLUTIONS

nnnn

ADSORBENT BREATHER

nnnn

ASSEMBLY (ABA)

nnnn

Disk Drive

nnnn

DESCRIPTION

nnnn

The Adsorbent Breather Assembly (ABA)

nnnn

integrates a breather filter, adsorbent pouch

nnnn

filter and a diffusion channel into a single

nnnn

filter assembly. A pressure-sensitive adhesive

nnnn

label secures the filter over the breather hole

nnnn

inside the drive.

nnnn

PRINCIPLE OF OPERATION

nnnn

The ABA is designed to provide protection

nnnn

from particles, hydrocarbons, acid gases,

nnnn

and the effect of water vapor, such as

nnnn

condensation and corrosion. The filtration

nnnn

membrane removes particles from incoming

nnnn

air. The adsorbent element is specially

nnnn

formulated to control humidity and to adsorb

nnnn

acid gases and hydrocarbons from internal

nnnn

and external sources. The integral diffusion

nnnn

channel reduces the amount of hydrocarbons,

nnnn

water vapor, and acid gases entering the

nnnn

drive from the surrounding environment and

nnnn

thereby extending the life of the adsorbent.

nnnn

The most common adsorbents and their

nnnn

associated functions are as follows:

nnnn

• Activated Carbon: Relative humidity

nnnn

control and adsorption of hydrocarbons

nnnn

• Chemically Treated Activated Carbon:

nnnn

Relative humidity control and adsorption

nnnn

of acid gases and hydrocarbons

nnnn

• Silica Gel: Relative humidity control

nnnn

INSTALLATION IN DRIVE

nnnn

The ABA is located on the inside of the drive. The filter

nnnn

location should be in a low pressure area of the drive so

nnnn

that air can enter through the breather. Generally, the best

nnnn

location is on the cover or the base casting as close as

nnnn

possible to the spindle.

nnnn

Adsorbent Material

nnnn

Plastic Body

nnnn

Adhesive

nnnn

PTFE Membrane

nnnn

Diffusion Channel

nnnn

Carrier

nnnn

Drive Cover or Base

"