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Accessories
Diffusion Dryer
Model 250
Instruction Manual
P/N 1800114, Revision C
December 2012
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i
Sections
Contents
Introduction .............................................................................................. 1
Unpacking ................................................................................................. 3
Installation ................................................................................................ 3
The Diffusion Dryer Components ............................................................ 4
Inlet and Outlet Connectors ............................................................. 4
Desiccant Dryer .............................................................................. 4
The silica gel cartridge .................................................................... 4
Servicing the Diffusion Dryer................................................................... 6
Restoring the Desiccant Cartridge ................................................... 6
Removing the Desiccant Cartridge .................................................. 6
Inserting the Desiccant Cartridge .................................................... 7
Figures
Tables
Specifications ............................................................................................ 9
Contacting ATI for Service ................................................................ .... 10
For Technical or Application Questions ........................................ 10
For Customer Service .................................................................... 10
MSDS Silica Gel...................................................................................... 11
Warranty ................................................................................................ 14
Figure 1 Diffusion Dryer ............................................................................ 2
Figure 2 Schematic of the desiccant cartridge assembly (Patent Pending) ... 5
Figure 3 Replacing the desiccant cartridge .................................................. 8
Table 1 Packing List for the Diffusion Dryer Model 250............................. 3
Table 2 Drying Capacity of the Diffusion Dryer (Model 250) ..................... 6
Table 3 Specifications of the Diffusion Dryer Model 250 ........................... 9
Diffusion Dryer Model 250
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Diffusion Dryer Model 250
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1
Introduction
Diffusion Dryer
Model 250
The Diffusion Dryer is designed as a general-purpose aerosol
dryer. A water trap at the inlet of the dryer removes coarse water
droplets. The aerosol is then passed through a removable
cartridge containing the silica gel. The cartridge is formed by two
concentric cylinders, an inner fine wire mesh screen and an outer
wire mesh screen.
As the aerosol goes through the inner cylinder of the cartridge,
the water vapor diffuses into the silica gel through the mesh
screen. Silica gel is an amorphous form of silicon dioxide, which
is synthetically produced in the form of hard irregular granules or
hard irregular beads. A micro porous structure of interlocking
cavities gives a very high surface area (800 square meters per
gram). It is this structure that makes silica gel a high capacity
desiccant. Water molecules adhere to the gels surface because it
exhibits a lower vapor pressure than the surrounding air. When
pressure equilibrium is reached, no more adsorption occurs. The
beauty of silica gel is the physical adsorption of water vapor into
its internal pores. There is no chemical reaction, no by products
or side effects. Even when saturated with water vapor, silica gel
still has the appearance of a dry product, its shape unchanged.
The silica gel is easily regenerated in an oven at 250°F for three
hours.
Particle loss is minimized because the particles do not come into
contact with the silica gel.
Diffusion Dryer Model 250
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Sealing Plug
Inlet Connector
Desiccant Dryer
Removable
Outlet
Mounting
plate
Spring holder
Figure 1
Diffusion Dryer
End Cap
Diffusion Dryer Model 250
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3
Qty.
Item
Part Number
1
Desiccant Dryer Assembly
0200289
1
Spare Desiccant Cartridge
0200293
1
Instruction Manual
1800114
1
Mounting template for the dryer holders
1700157
1
MSDS Silica Gel
N/A 2 Fitting Kit
N/A
Unpacking
The Diffusion Dryer consists of a desiccant dryer assembly with
fittings attached, a silica gel cartridge and accessories, including
the following:
Table 1
Packing List for the Diffusion Dryer Model 250
After unpacking, if anything is missing or appears to be damaged,
contact ATI Customer Service at (410) 363-9696.
Installation
Two spring-action holders coated with white nylon are provided to
mount the dryer horizontally. See the included sheet for mounting
instructions.
To install the silica gel cartridge in the dryer, refer to the section
“Inserting the Desiccant Cartridge” page 7.
The dryer is conveniently fitted with CPC Quick Couplings with
a 1/8” nominal flow. Matching couplings with hose barb
connection are provided to connect the dryer to ¼” inside
diameter tubing. Before using the dryer, remove the sealing plug
from the inlet and outlet of the dryer.
Diffusion Dryer Model 250
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The Diffusion Dryer Components
Inlet and Outlet Connectors
The inlet and outlet connectors are CPC quick coupling
connectors with 1/8” nominal flow path. A matching set of quick
coupling insert is provided that connect to ¼” ID tubing. A set of
sealing plugs is also provided to prevent moisture from entering
the dryer while not in use.
Desiccant Dryer
The Diffusion Dryer is a general-purpose aerosol dryer consisting
of a Plexiglas cylinder terminated by two Delrin® end caps. The
inlet end cap has a removable cover allowing the desiccant
cartridge to be easily replaced.
The silica gel in the desiccant cartridge maintains a dry
atmosphere within the dryer. Passing the aerosol through this
tube dries the aerosol particles without substantial particle loss.
The silica gel cartridge
The desiccant cartridge is made of two perforated end caps
joined together by two wire mesh cylinders. The inner cylinder is
made of very fine wire mesh screen allowing moisture to diffuse in
the silica. The outer cylinder is made of a much larger wire mesh
screen allowing the user to view the silica gel while still retaining it
inside the cartridge. The annular space between the two wire
mesh and the end caps is filled with yellow silica gel. This silica
gel turns from a yellow color when dry to a dark green color when
fully saturated.
Why not use regular blue indicating silica gel?
ATI is taking the safety of its customer very seriously. Standard
blue indicating silica gel contains Cobalt Chloride in small
concentrations (0.5 to 1.0% by weight). As of July 1, 2000, British
Chemical Regulations have required that indicating silica gel be
labeled and disposed of as a hazardous material. While cobalt
chloride has not yet been listed on any U.S.-based hazardous
materials registries, its change in status suggests that this
material should be treated with the same level of protection as is
required elsewhere. Cobalt is a skin and respiratory system
sensitizer. The cancer status varies on Material Safety Data
Sheet (MSDS) reports provided by manufacturers and suppliers
from “no reports” to “Cobalt and its compounds have been shown
to cause cancer in laboratory animals.” The threshold limit value
(TLV) is 0.01 mg/m3
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Caution
All silica gel is listed as “hazardous waste” by the EPA (Resource
Conservation Recovery Act) and must be disposed of appropriately.
Contact your regional HAZMAT coordinator to obtain information on
appropriate storage containers and disposal instructions.
Outer Tube, Coarse Stainless
Steel Wire Mesh
End Cap
Annular space filled
with Yellow Silica Gel
Inner Tube,
Fine Stainless Steel Wire Mesh
Although the concentration of cobalt is small in indicating silica
gel, concerns revolve around the possible contamination of silica
gel dust with cobalt chloride. There also are hazards stemming
from the inhalation of silica dust. That is why ATI turned to “Silica
Gel Yellow”, an indicator gel with phenolphthalein (0.01% by
weight concentration).
Figure 2
Schematic of the desiccant cartridge assembly
(Patent Pending)
Diffusion Dryer Model 250
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Servicing the Diffusion Dryer
Caution
Only use a dedicated oven to regenerate the silica gel. Do not use an
oven that might also be used to reheat or cook food.
How Used
Measured
Relative
Humidity at Exit
(%) at 74°F
Measured
Relative
Humidity at Exit
(%) at 74°F
No diffusion dryer
80
60
With one diffusion dryer Model 250
22
21
With one diffusion dryer Model 250
(after 3 hours)
27
23
Restoring the Desiccant Cartridge
The silica gel used in ATI desiccant cartridges is yellow when dry
and turns green when saturated. To dry the silica gel, remove the
cartridge from the diffusion dryer (see next section) and heat it in
an oven at 250°F [120°C] for 3 hours or until the yellow color
returns. If the yellow color does not return, the silica gel is no
longer usable and must be replaced.
The operational time of the regenerated desiccant cartridge
depends on the aerosol moisture content and flow rate through
the diffusion dryer.
The following data represents the drying capacity of the dryer. It
was tested using a constant output generator, at an aerosol flow
rate of 4.0 liters per minute.
Table 2
Drying Capacity of the Diffusion Dryer (Model 250)
Removing the Desiccant Cartridge
To remove desiccant cartridge, do the following:
1. Disconnect the inlet and outlet connection and remove
the dryer from its holding brackets. (Refer to Figure 1)
2. Remove the end cap of the dryer by turning it counter
clockwise.
3. Cover the open end with your hand and turn the dryer
upside-down. Hold the desiccant cartridge as it is
coming out of the dryer. (Refer to Figure 3)
Diffusion Dryer Model 250
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Caution
Do not attempt to unscrew the extremities of the acrylic tubing. They have
been epoxied in place and tested for leakage. Forcing them to unscrew
could damage the dryer.
4. Dry the desiccant cartridge as described in the previous
section or replace it with new desiccant cartridge.
Inserting the Desiccant Cartridge
To install the desiccant cartridge, do the following:
1. Disconnect the inlet and outlet connection and remove
the dryer from its holding brackets. (Refer to Figure 1)
2. Remove the end cap of the dryer by turning it counter
clockwise.
3. Install the desiccant cartridge by lowering it inside the
dryer.
4. Make sure that the “O” ring is present on the end cap.
5. Replace the end cap on the dryer by turning it
clockwise. Make sure that the end cap is completely
threaded in place.
6. Replace the dryer in its holding bracket and reconnect
the fittings to the inlet and outlet.
Diffusion Dryer Model 250
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Removable end cap
Desiccant cartridge
Diffusion dryer body
Figure 3
Replacing the desiccant cartridge
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Flow rate
4 L/min
Maximum pressure
415 kPa (60 psig)
Desiccant
Type
Silica gel (orange, green when
saturated)
Capacity
0.250 kg
Fittings
CPC Quick Disconnect
Coupling
with hose barb for ¼” ID tubing
Dimensions
Length (without fittings)
28.2 cm (11.1 in)
Diameter (cylinder only)
5.67 cm (2.23 in)
Weight (with one cartridge)
0.57 kg (1.26 lb)
Specifications
The following specifications—which are subject to change—
describe the most important data of the diffusion dryer.
Table 3
Specifications of the Diffusion Dryer Model 250
Specifications are subject to change without notice.
Diffusion Dryer Model 250
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Contacting ATI for Service
For Technical or Application Questions
If you have any difficulty setting up the Diffusion Dryer Model 250,
or if you have technical or application questions about this
instrument, contact an applications engineer at ATI (410) 363-
9696.
For Customer Service
If the Diffusion Dryer is not operating properly, or if you are
returning the instrument for service, contact ATI Customer
Service (410) 363-9696. Customer Service will need this
information when you call:
The instrument model number
The instrument serial number
A purchase order number (unless under warranty)
A billing address
A shipping address.
Use the original packing material to return the Diffusion Dryer
Model 250 to ATI. If you no longer have the original packing
material, use sufficient packing material so the instrument is not
damaged during shipping.
Diffusion Dryer Model 250
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Company Name:
Product Name:
Air Techniques International
INDICATOR SILICA GEL
Revision Date:
Preparation Date:
09/04/2003
09/04/2003
Address:
11403 Cronridge Drive
Owings Mills, MD 21117-2247
Telephone:
(410) 363-9696
Emergency Telephone Number:
Chemtrec 1-800-424-9300
Chemical
Concentration
Hazard data
CAS Number
Silica Gel (SiO2)
99%
Non Hazardous
112926-00-8
Phenolphthalein
100ppm
Hazardous
77-09-8
Boiling Point:
Specific Gravity:
N/A
N/A
Vapor Pressure @ 20oC:
Melting Point:
N/A
1713 +60C
Vapor Density:
Evaporation Rate:
N/A
N/A
Water Solubility:
Bulk Density (g/m3):
Insoluble
700-800
Appearance:
Odor:
Yellow beads or Granules ph 4-8
Odorless
MSDS Silica Gel
Section I – Chemical Product and Company Information
Section II – Composition/Information
Section III - Physical/Chemical Characteristics
Section IV - Fire & Explosion Data
Flash Point: N/A
Method Used: N/A
Flammable Limits: Non-flammable
UEL: N/A
LEL: N/A
Extinguisher Media: N/A
Special Firefighting Procedures: N/A
Unusual Fire and Explosion Hazards: N/A
Section V - Physical Hazards (Reactivity Data)
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Stability:
Stable X Unstable
Conditions to Avoid:
N/A
Hazardous Polymerization:
May occur Will not occur X
Conditions to Avoid:
N/A
Hazardous Decomposition Products: N/A
Section VI - Health Hazards
Route of Exposure
Inhalation ->
Skin Absorption: ->
Skin Contact: ->
Eye Contact: ->
Ingestion: ->
Signs and Symptoms of Exposure: N/A
Effects of Overexposure:
Acute Exposure: N/A
Chronic Exposure: N/A
Medical Conditions Aggravated by Exposure: N/A
Emergency and First Aid Procedures
Eyes: Flush with large amounts of cold water.
Skin: Wash affected area with soap and water.
Inhalation: If inhaled, move to fresh air, get medical attention for any difficulty breathing.
Ingestion: Administer plenty of water
Section VII – Safe Handling and Use
Spill Response: Sweep up
Waste Disposal: Comply with local regulations for non-hazardous chemical disposal
Section VIII - Special Protection Information and Control Method
Respiratory Protection: NIOSH approved dust mask when working with powder.
Ventilation: Natural ventilation
Protective Gloves: Working gloves
Eye Protection: N/A
Other Protective Clothing or Equipment: N/A
Section X – Transportation and Shipping Requirements
DOT Shipping Name: N/A
DOT Hazard Class: Non-hazardous
DOT Identification Number: Not applicable
DOT Packing Group: Not applicable
Hazardous Waste: None
Diffusion Dryer Model 250
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Disclaimer: This document has been prepared in good faith and from information provided
to us by our suppliers and other sources considered to be reliable. No warranty, express or
implied is given. The buyer is responsible to evaluate all available information when using
this product for any particular use. The buyer is also responsible for complying with all
Federal, State, Provincial, and Local Laws and regulations when using this product.
Diffusion Dryer Model 250
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Warranty
Part Number
1800114 / Revision B/ November 2010
Address
Air Techniques International / 11403 Cronridge Drive / Owings
Mills, MD 21117 / USA
Phone No.
(410) 363-9696
Fax No.
(410) 363-9695
E-mail Address
info@atitest.com
Limitation of Warranty and
Liability
Air Techniques International, hereinafter referred to as ATI,
warrants the equipment purchased hereunder to be free from
defect in materials and workmanship under normal use and
service, when used for the purpose for which it is designed, for
a period of (1) one year from the date of shipment. ATI further
warrants that the equipment will perform in accordance with the
technical specifications accompanying the formal equipment
offer.
ATI will repair or replace any such defective items that may fail
within the stated warranty period, PROVIDED:
a. That any claim of defect under this warranty is made within
thirty (30) days after discovery thereof and that inspection
by ATI, if required, indicates the validity of such claim to
ATI’s satisfaction.
b. That the defect is not the result of damage incurred in
shipment to or from our factory.
c. That the equipment has not been altered in any way
whether as to design or use, whether by replacement parts
not supplied or approved by ATI, or otherwise.
d. That any equipment or accessories furnished but not
manufactured by ATI, or not of ATI design, shall be subject
only to such adjustments as ATI may obtain from the
supplier thereof.
ATI’s obligation under this warranty is limited to the repair or
replacement of defective parts with the exception noted above.
If the equipment includes a scattering chamber, ATI’s warranty
does not extend to contamination of the scattering chamber by
foreign material.
At ATI’s option, any defective equipment that fails within the
warranty period shall be returned to ATI’s factory for inspection,
properly packed with shipping charges prepaid. No equipment
Diffusion Dryer Model 250
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shall be returned to ATI without prior issuance of a return
authorization by ATI.
No warranties, express or implied, other than those specifically
set forth herein shall be applicable to any equipment
manufactured or furnished by ATI and the foregoing warranty
shall constitute the Buyer’s sole right and remedy. In no event
does ATI assume any liability for consequential damages, or for
loss, damage or expense directly or indirectly arising from the
use of ATI products, or any inability to use them either
separately or in combination with other equipment or materials
or from any other cause.
Service Policy
Our service policy is designed to give prompt attention to any
problems. If you encounter a defective product or discover a
malfunction, please call ATI Customer Service to obtain a return
authorization at (410) 363-9696.
Diffusion Dryer Model 250
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Diffusion Dryer Model 250
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11403 Cronridge Drive, Owings Mills, MD 21117-2247 U.S.A.
Air Techniques International
Web: www.air-techniques.com
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