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Adjust-A-Shelf™ Desiccators
(Dry Nitrogen Cabinet) Overview

Adjust Shelf Desiccators
Shown: No. 3950-36D, with optional Dual Purge and NitroWatch controllers, stand, solid stainless steel shelves, and nitrogen generator.
CE Mark All desiccator cabinets and Dual Purge™/ NitroWatch™ control systems. CE Declaration


QuickQuote Use the QuickQuote tool to help you select a desiccator for your application
humidity level critical Static Control Features Shelf Options
Versatile Adjust-A-Shelf desiccator cabinets protect your moisture-sensitive materials and eliminate harmful electro-static discharge and particulate contamination. One-piece door gaskets inhibit outgassing while the LiftLatches prevent metal-on-metal scraping common with rotary latches. Illustration dimensions are inches (mm).
Features Key

A Dual Purge™ System
B NitroWatch® RH Controller
C Stainless-Steel-Framed Doors
D Grounding Terminals (SDPVC models)
E Door Sensor Switches
F Plenum Chamber
G Automatic RB® Valve (one per chamber)
H One-Piece Gasket
I Stainless Steel Wire Racks
J Stainless Steel Perforated Shelf (1)
K Grounded Door Latch (SDPVC models)
L Stands
C Tamper-Proof Hinges
Flowmeter (not shown)
N Nitrogen Generator (optional)

one chamber two chamber three chamber four chamber five chamber
One Chamber Two Chambers Three Chambers Four Chambers Five Chambers
17 x 18 x 12
(432 x 457 x 1219)
24 x 24 x 24
(610 x 610 x 610)
17 x 18 x 24
(432 x 457 x 610)
24 x 18 x 24
(610 x 457 x 610)
24 x 24 x 36
(610 x 610 x 914)
17 x 18 x 36
(432 x 457 x 914)
24 x 18 x 36
(610 x 457 x 914)
24 x 24 x 48
(610 x 610 x 1219)
17 x 18 x 48
(432 x 457 x 1219)
24 x 18 x 48
(610 x 457 x 1219)
24 x 24 x 60
(610 x 610 x 1524)
17 x 18 x 60
(432 x 457 x 1524)
24 x 18 x 60
(610 x 457 x 1524)
six chamber eight chamber ten chamber
Six Chambers Eight Chambers Ten Chambers
45 x 24 x 36
(1143 x 610 x 914)
34 x 18 x 36
(864 x 457 x 914)
45 x 18 x 36
(1143 x 457 x 914)
45 x 24 x 48
(1143 x 610 x 1219)
34 x 18 x 48
(864 x 457 x 1219)
45 x 18 x 48
(1143 x 457 x 1219)
45 x 24 x 60
(1143 x 610 x 1524)
34 x 18 x 60
(864 x 457 x 1524)
45 x 18 x 60
(1143 x 457 x 1524)
  • Durable, efficient nitrogen-purged storage cabinets from the industry-leading desiccator dry cabinet manufacturer
  • Automatically maintains clean, dry, static-safe conditions to reduce part defects and extend product yields
  • Optional Smart humidity controllers provide unsurpassed efficiency to reduce nitrogen costs and maintain a constant, traceable clean, dry environment—
    • SmartDesiccator™ nitrogen cabinets incorporate humidity sensor/display module into benchtop cabinets
    • NitroPlex™ dry nitrogen cabinets provide multiplexed nitrogen control for optimal efficiency in larger desiccators
  • Unique design and fabrication techniques produce durable, tight-sealing nitrogen cabinets
  • Plenum chamber minimizes backfill, ensures uniform gas distribution
  • Automatic RB® (Relief/Bleed) Valves stabilizes internal pressure, protects dry cabinet doors and seals
  • Adjustable Flowmeter allows regulation of incoming nitrogen flow rate
  • Full line of standardized sizes and components simplifies parts replacement
  • Doors with 304 stainless steel frames extend cabinet's service life and improve sealing performance
  • Stainless steel wire racks allow shelf placement at one-inch increments
  • Perforated (one included) or solid shelves help organize items and efficiently use chamber space
  • Locking LiftLatches™ open and close without straining doors, provide lock-out security
  • Static-control options protect sensitive materials against ESD
  • Grounded rack and door latch and built-in grounding terminals provide additional ESD safety
  • Conforms to DOD Handbook 263, MIL-SPEC 1686 and 1772 with selection of proper accessories

Adjust-A-Shelf Desiccators
Adjust-A-Shelf Desiccators Adjust-A-Shelf Desiccators
No. 3950-45D, shown with optional stainless steel shelves, humidity controls, stand. No. 3950-48D, shown with optional 304 stainless steel shelves, humidity controls, stand.
esd Available in Static-Dissipative PVC for long-lasting ESD & particle control.
Sheets in stock for immediate delivery.
Standard Adjust-A-Shelf™ Desiccator Cabinets
(Model Shown: No. 3950-36D with options)

Versatile Shelf Options
Terra offers a variety of shelf solutions. Shelves can be positioned at 0.5" (13 mm) increments to accommodate different part sizes; they can also be removed and used as carrying trays. Grounding terminals are included standard on all Static-Dissipative PVC desiccators, allowing you to ground racks and shelves. Grounding is optional on acrylic chambers.

Acrylic shelves feature stainless steel BowGuards™ that support up to 35 lbs (15.9 kg).

304 stainless steel shelves, which support loads up to 45 lbs (20.4 kg), are available as solid or with perforations to facilitate gas flow. Their slight depth, 0.5" (13 mm), provides a retaining lip along all edges.

Why is Electropolishing Critical?
Removes iron and other surface impurities that cause corrosion
Draws chromium and nickel to form a hard, protective finish
Removes irregularities (pits and burs) for an ultra-smooth surface that's easy to clean
More on Terra's electropolishing procedures...
Biosafe Registered Logo
All stainless steel shelves and trays
304 stainless steel trays are 2.625" (67 mm) deep and so offer more roomy, secure storage space than shelves. They also provide optimal ESD protection. When grounded stainless steel shelves or trays are placed immediately above each other, they create a Faraday cage that completely blocks out electrostatic charges. Trays are also convenient for carrying parts after they are removed from the desiccator.

304 stainless steel shields are designed to protect plastic chambers from scratching. They are highly recommended for installation on static-dissipative PVC chambers, which can, after repeated scraping and rubbing, lose their dissipative characteristics.

Adjust-A-Shelf Desiccators Versatile Shelf Options


Adjust-A-Shelf Desiccators Versatile Shelf Options

Stainless steel shelf (top);
stainless steel tray (bottom)
  Acrylic shelves shown with and
without stainless steel BowGuards

Specialized Shelf Solutions
Adjustable Racks for Carrier Reel Storage Kitting Trays Slide-Out Drawers
Adjustable Racks for Carrier Reel Storage Kitting Trays Slide-Out Drawers
IC Tube Inserts   IC Tube Inserts
These versatile storage fixtures adapt a standard Adjust-A-Shelf™ Desiccator chamber for IC tube storage.

Each fixture includes four horizontal shelves, spaced 1.25" (32 mm) apart, with slots that allow vertical insertion of dividing rods. These rods let you form bin sizes to accommodate IC tubes of many dimensions. Select stainless steel shields to prevent scratching (one shield is recommended for each dissipative PVC shelf). Spaces are provided for bin labels.

Fits Desiccator
with Shelf ID
inches (mm)
Acrylic* Dissipative PVC 304 Stainless Steel Shield
Cat. # Price Cat. # Price Cat. # Price
14.25 x 14.5
(362 x 368)
1508-50 $ 433 1508-53 $ 785 1508-56 $ 155
19.875 x 14.5
(505 x 368)
1508-51 $ 523 1508-54 $ 1,033 1508-57 $ 173
19.875 x 21
(505 x 533)
1508-52 $ 704 1508-55 $ 1,419 1508-58 $ 212
*Acrylic is damaged by alcohol and other cleaning agents.

Static Control Solutions
Even the slightest static discharge can spell disaster for today's delicate components. Because the dangers of ESD (electrostatic discharge) are amplified in a low humidity environment, Terra strongly urges that you consider these measures as part of your static control program.
Adjust-A-Shelf Desiccator
Faraday cage protects shelf contents against ESD
Desiccator Grounding
All Terra desiccators made of static-dissipative PVC feature grounding terminals on a standard basis. The surface resistivity of this material (around 107 ohms/square) allows controlled dissipation of static charges from any surface in the cabinet, including shelves. Conductive grounding connections safely direct charges to a grounding terminal (standard on SDPVC cabinets; order separately for acrylic cabinets below).
Desiccator Grounding
Desiccator Grounding
Includes installation of conductive grounding tape and grounding terminals. Charge is per chamber; quantity should correspond to number of chambers affected. (Included standard on cabinets made of static-dissipative PVC.)
Cat.# Price
1600-59A $ 117
Warning: Grounded conductive connectors can create sparking, which can damage sensitive materials. Use of a resistor (not included) is recommended.

1. Static-Dissipative PVC
Acrylic, the most common plastic used in storage enclosures, is a prolific static generator. The act of cleaning an acrylic desiccator with a cleanroom wiper is enough to generate surface charges that can discharge onto semiconductor components. One way to avoid potentially disastrous static damage is to select Static-Dissipative PVC.

This material not only dissipates static charges safely, but it also eliminates the particle attraction that static charges create. Surfaces stay clean, inside and out, making this material perfect for use in Class 1 cleanrooms.

Because static-dissipative PVC is transparent and highly durable, it can be used in place of acrylic in nearly any application, desiccators included. It features a surface resistivity of approximately 107 ohms per square, placing it in the "dissipative range". It is completely noncontaminating—with no measurable outgassing—and it resists a wide range of chemicals.

Note: To protect Static-Dissipative PVC surfaces, desiccators made of this material must include stainless steel shields installed at the bottom of each chamber.

2. Self-Balancing Ionizing Nozzles
By ionizing nitrogen molecules as they pass through the desiccator plenum wall, ionizing nozzles neutralize electrostatic charges on all interior surfaces. They provide practical ESD control for charged nonconductive materials, which cannot dissipate charges to ground. And because they eliminate static attractive forces, they help control contamination: in a statically neutral environment, any airborne particles that enter a desiccator are more likely to remain airborne and to be purged out of the cabinet.

3. Conductive Shelves, Shields and Trays
For smaller components that can be stored on shelves, Terra's grounded stainless steel shelving provide a 100% ESD-safe enclosure.

As the illustration depicts, grounded conductive plates (such as shelves) create a Faraday cage that prevents penetration of static charges. Because these conductive units are removable, they also protect your sensitive components from ESD as you transport them from one location to another.

By dissipating static charges, Static-Dissipative PVC also eliminates particle attraction, providing an important contamination-control benefit!

File Type File Name Publication Date
White Paper (PDF) On-Site Nitrogen Generation: Cheaper, Easier, More Reliable
Learn how on-site nitrogen generation saves money by not having to order canisters of inert gas for desiccators, glove boxes and analytical instruments. You can make your own purified nitrogen from compressed air using a sophisticated membrane module (find out how it works!).
Tech Resource (PDF) Why Desiccator Storage?
A technical overview to how desiccators extend shelf lives and increase product yields.
Tech Resource (PDF) Why Terra Desiccators?
Compare the many design and fabrication features that make Terra desiccators the most efficient and durable cabinets available.
Tech Resource (PDF) Why Use Nitrogen?
A guide to how nitrogen purging protects moisture-sensitive materials.
Tech Resource (PDF) Desiccator Installation and Cleaning
Recommended cleaning techniques and agents for various desiccator materials.
Manual (PDF) Desiccator Cabinets and RH Controllers: Doc. # 1800-40
This manual provides installation and operating instructions for the following Terra desiccator lines: Adjust-A-Shelf, Pass-through, Wafer Box, Kitticator, Tape and Reel, Farracator and Series 100 through 400. The manual also covers the following RH Controllers: Flowmeter, Dual Purge System and NitroWatch.
24-hour sales and tech phone support, M - F
Call a Terra Desiccator specialist direct
Hours: 5:30 - 17:30 M-F
(your local time)
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