Terra Part # 3950-04D
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67202
Desiccator; Adjust-A-Shelf™, Static Dissipative PVC, 8 Chambers, 35" W x 18" D x 48" H

• Nitrogen-purge desiccator cabinet provides versatile low-humidity storage down to 0% RH

• Designed for moderate to critical RH control applications that require automatic low-humidity control

• Desiccator cabinet is pre-wired for integration with automatic humidity control system

• Ideal for storing moisture-sensitive materials: microelectronics, medical devices, pharmaceutical powders

• Upgrade to IsoDry® or Nitroplex™ for faster recovery times and more uniform low-humidity conditions

• Adjust-A-Shelf desiccator cabinets are designed for storage of moisture-, ESD-, and contamination-sensitive materials that require automatic low-humidity set-point control.

How Dual Purge™ and NitroWatch™ Work:

• Dual Purge™ and NitroWatch™ are separate modules that mount on top of the desiccator cabinet. The combined system provides automatic humidity control from ambient down to 0% RH and helps conserve nitrogen.

• NitroWatch™ monitors and displays RH readings from a single sensor mounted inside the cabinet. The Dual Purge™ uses two gas flow settings (high/low) to rapidly reach and then maintain the user-specified RH set-point.

• High-flow is triggered when RH is above set-point, or when a door opens (triggered by magnetic door sensors). The high-flow setting helps expedite set-point recovery.

• The influx of nitrogen gas pressurizes the cabinet, causing moisture-laden air to be displaced and released through the automatic relief/bleed (RB) valves. This steady bleed causes the concentration of dry nitrogen gas inside the desiccator to increase until the desired RH level is reached.

• When the RH set-point is reached, the system reverts from high-flow to low-flow nitrogen gas supply to maintain the set-point and conserve nitrogen. When RH climbs above the set-point, the system re-activates high-flow to accelerate moisture removal.

NOTE: Because this system uses only 1 RH sensor, the displayed RH reading may not accurately reflect the RH in other chambers of the cabinet.

ESD-Safe Design:

• Static-dissipative PVC (SD-PVC) design features bonded dissipative layers that resist abrasion and retain surface resistivity of 106 - 108 ohms/square indefinitely (unlike spray-on coatings that can wear off after a few years). SD-PVC also eliminates static-cling to help maintain clean surfaces.

Grounding tape connects doors and shelf racks to terminal block to safely-discharge surface charges and eliminate the risk of electrostatic discharge.

• Conforms to DOD Handbook 263, MIL-SPEC 1686 and 1772 with selection of proper accessories.

Cabinet Design:

Isolated chambers: The Adjust-A-Shelf desiccator cabinet is compartmentalized into isolated chambers to improve moisture control and recovery. The multiple air spaces are independent and thus RH in one chamber is unaffected by access to adjacent chambers.

Rear plenum for improved gas distribution: The gas inlet feeds into a narrow wall plenum adjacent to all chambers. The plenum pressurizes and simultaneously distributes gas through small perforations in the wall to each chamber in the cabinet.

All wiring and gas ports are factory installed for turn-key operation with Dual Purge™ and NitroWatch™ automatic RH control system. Each chamber includes a magnetic door sensor that connects to a central manifold. Wiring to connect the RH sensor is also pre-installed.

Innovative wall-fusing technology creates a rigid, durable structure for improved weight capacity and resistance to high-frequency vibrations.

Automatic RB™ (Relief/Bleed) valves on each chamber relieve excess pressure inside the cabinet without allowing outside air or contaminants inside.

Stainless steel wire racks allow shelves to be positioned at 1” increments to accommodate different part sizes; shelves can also be removed and used as carrying trays.

Door Design:

• Access doors with 304 stainless steel reinforced frames extend desiccator cabinet's service life and provide a tight seal.

Santoprene® “e”-shape non-outgassing rubber gasket firmly compresses to eliminate leaks. The one-piece resilient rubber gasket maintains its shape after compression and won't flatten, warp, crack, or degrade like ordinary foam gasket. Gasket is also mechanically attached to the door frame to avoid adhesive failure common with gasket tapes.

• Heavy-duty lift latches prevent metal-on-metal scraping common with rotary latches; chrome-plated included standard; upgrade to all-stainless steel (304 or 316) to minimize scratching, corrosion and contamination resulting over time that can occur with chrome-plated latches.

• Durable 304 stainless steel hinges eliminate corrosion, flaking, and contamination that commonly occur with ordinary chrome-plated hinges.

• Order replacement door(s) to ensure uninterrupted service should a door ever be damaged and require replacement.

Optional Accessories:

Nitrogen generator: provides a continuous, reliable supply of pure, dry nitrogen to eliminate dependence on bulky canisters.

Locking lift latches help protect against unauthorized access - specify one per chamber.

Chamber Dimensions: 16.625" W x 16.125" D x 11.625" H

Material: Static Dissipative PVC

Opening Dimensions: 16.125" W x 10.75" H

Number of Chambers: 8

Model: Adjust-A-Shelf™

Design: Floor

Chamber Width: 16.625"

Chamber Depth: 16.125"

Chamber Height: 11.625"

Humidity Control: Cabinet Level

Door Design: Leak Tight

Unit of Measure: EA

Marks & Listings: CE, UL, ULC

Weight, Product: 126 lb

Dimensions, Product: 35" W x 18" D x 48" H

Weight, Shipping: 246 lb

Dimensions, Shipping: 40.5" W x 55.5" D x 23.5" H

Package Type: Crate

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  3. Stainless Steel solid desiccator shelf with lip | 1976-05 displayed
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  4. Acrylic shelves with bow guards, top, support 35 lbs. (16 kg); bowing apparent without bow guards, bottom, with load of 10 lbs | 1976-01 displayed
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  5. Shelf supports ensure that this plastic chamber holds weight | 2200-21 displayed
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  6. Adjustable shelves support weight loads of up to 90 pounds. | 1976-04 displayed
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  9. Large 12"H powder-coated steel desiccator stand; optional casters simplify positioning and cleaning
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  10. Large 4"H stainless steel desiccator stand; optional casters simplify positioning and cleaning | 1740-92 displayed
    Stand; Adjustable, 304 Stainless Steel, Large, 4" H Stocked Item is in stock and ready for immediate shipping
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  12. Stainless steel LiftLatch. Product details may differ. | 1603-67-2 displayed
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  13. Small (4") locking latch, catcher included. Grid shows one-inch squares. | 1603-80 displayed
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  14. Portable Nitrogen generator, 24"W x 12"D x 49.25"H, with compact footprint produces up to 99% pure N2 gas | 2700-11B displayed
    Nitrogen Generator; 24"W x 12"D x 49.25"H, 88 ft³/hr @ 99% purity, 100 psig Stocked Item is in stock and ready for immediate shipping
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  15. Stores 16,382 temperature readings and 16,382 relative humidity measurements. | 9500-10 displayed
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  16. Increases security of desiccators equipped with Terra LiftLatch and accommodates most standard padlocks. | 1603-34 displayed
    Locking Bracket; SS, LatchLock, for Side-by-Side Chamber Desiccators Stocked Item is in stock and ready for immediate shipping
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  17. Ionizing module safely neutralizes static charges in pressurized desiccator cabinets | 2006-01 displayed
    $2,326
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  18. FasTrak 24-7 Expediting Service
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  19. UL Listing Declaration for Desiccators
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  20. Qualification Documentation (IQ/OQ) for Terra Universal System
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  21. Equipment Testing
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  22.  | 1976-02 displayed
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  23. Acrylic flow meter, valve-2-20SCFH | 1600-32 displayed
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  24. Terra's Automated RB Valve provides safe pressure release and prevents influx of room air | 1600-60B displayed
    Automatic RB® (Relief/Bleed); for all Desiccators, Black Stocked Item is in stock and ready for immediate shipping
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  25. 1504-01-rack-storage-chamber-EPSS | 1504-01 displayed
    Rack, Storage Chamber, 304 SS, 12''L x 7.5''H x 13/16''D Stocked Item is in stock and ready for immediate shipping
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  26. Small (4") LiftLatch with Catcher | 1603-84 displayed
    LiftLatch; Chrome-Plated, Small Non-Locking Stocked Item is in stock and ready for immediate shipping
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  27. Installed grounding terminal; location may vary depending on product | 1686-12 displayed
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Learn More About Adjust-A-Shelf Desiccators

  • Adjust-A-Shelf Desiccators
  • Desiccators: Features and Design overview
  • IsoDry® Desiccator Cabinet by Terra Universal
  • 3-Chamber Static-Dissipative PVC Desiccator Cabinet Three-Chamber SDPVC Desiccator Cabinet
  • Benchtop Adjust-A-Shelf Desiccator Cabinet Static-Dissipative PVC Adjust-A-Shelf Desiccator Cabinet
  • plastic desiccator cabinet with 10 chambers and automatic humidity control system Plastic Desiccator Cabinet with Automatic RH Control System and Nitrogen Generator
  • Leveling your Desiccator
  • Static Dissipative PVC Open Desiccator Cabinet Desiccator Cabinet, Adjust-A-Shelf; SDPVC, Nominal 12"W x 12"D x 12"H
  • Stainless steel cleanroom cart with built-in amber acrylic desiccator cabinet Clean, Dry, ESD-Safe Transport Solutions
  • Smart desiccator cabinet in acrylic with 304 stainless steel framed door Smart Desiccator Cabinet with Automatic RH Control

Features and Benefits

ESD Protection

Static Control Solutions in Nitrogen-Purged Desiccator Cabinets

Because the likelihood of ESD (electrostatic discharge) increases in a low humidity environment, Terra strongly urges that you consider these measures as part of your static control program.

Static-Dissipative PVC

Acrylic, commonly used in storage enclosures, is a prolific static generator. Wiping an acrylic desiccator generates surface charges that can discharge onto ESD-sensitive components. Static-dissipative PVC prevents this danger.

This material not only dissipates static charges safely but also eliminates the particle attraction that static charges create. Surfaces stay clean, inside and out, making this material perfect for use in 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 10^7 ohms per square and 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.

Static-Neutralizing 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.

Desiccator Grounding
Grounding Terminal

All Terra desiccators made of static-dissipative PVC feature grounding terminals on a standard basis. The surface resistivity of this material (around 10^7 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).

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.

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.

Reinforced Doors with Non-adhesive Gaskets

Stainless steel door frames extend desiccator life; one-piece fused gaskets are non-outgassing, will not creep or sag

Fully Grounded ESD-Safe Desiccator Cabinet Designs

Grounded, static-dissipative desiccator cabinets safely discharge surface charges to ground, eliminating the risk of electrostatic discharge and attractive forces that seize particles. Conductive tape connects the shelves, racks and doors to the grounding bar at the top of the cabinet.

Flow Meter Helps Monitor and Control Nitrogen Gas Flow

A flow meter is a low-cost option suitable for non-critical applications or small desiccators that do not require much inert gas. However, manual control is more prone to human error and not as efficient with the consumption of inert gas, which can lead to damaged products and high operating costs.

Durable Embedded Static-Dissipative Layers

Terra's SDPVC features bonded dissipative layers that resist abrasion. SDPVC desiccators retain their surface resistivity of 106 - 108 ohms/square indefinitely (unlike spray-on coatings that can wear off after a few years), protecting your materials against ESD damage. Further, the control of static charges eliminates particle attractions, helping maintain clean surfaces.

Desiccator Plenum Chamber For Uniform Gas Distribution

Multi-chamber desiccator cabinets include a perforated plenum to minimize back fill, ensure uniform gas distribution to all chambers and increase cabinet strength

Available Stainless Steel Shelves and Trays

Adjustable, non-contaminating shelves and trays slide on stainless steel racks, allowing easy parts access (one perforated shelf included)

High Caliber Hardware

Seemingly small details like latches, ports, glides and hinges are often overlooked or ignored by other manufacturers, and later become the point of costly recurring maintenance or equipment failure. Terra’s products are made of long lasting, cleanroom compatible, top tier hardware. Individual components are carefully designed and rigorously tested to guarantee the highest quality, durability, and craftsmanship.

Automatic Relief/Bleed Valve

Terra's Automatic Relief/Bleed (RB) Valve opens up at 0.01 PSI, relieving overpressure that could damage desiccators; also works as a check valve to prevent influx of room air.

Doors - The First Failure Point of a Desiccator Cabinet

Terra’s stainless steel door frames eliminate the need for internal reinforcements, which create particle surfaces and compromise cleaning. Unlike other doors with glue-on anti-bow pieces, Terra’s doors use no adhesives. This eliminates particle traps, sources of outgassing—and extends the strength and service life of the desiccator.

Complete Order Transparency

Using Terra’s OnTrak system, our customers can view real-time production updates, receive shipment notifications and track their orders until they arrive at their facility

Product Prices Honored Worldwide

From Argentina to Zimbabwe, Terra's customers pay a single web-listed price for each product

Wide Selection of Global Shipping Options

Terra offers a broad range of global shipping services including door-to-door and white glove delivery

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements

Popular Accessories

For a full list of accessories, select a product then click Choose Accessories on that product page.
  • 3-inch Diameter Caster Set
    Casters are easily retrofitted for mobility. Products can be rolled out of the way when cleaning or relocated as workflow changes.
  • Dual Purge™ and NitroWatch™ Work Together to Fully Automate RH Control
    Terra's Dual Purge™ and NitroWatch™ operate in tandem to precisely and automatically control the flow of nitrogen and maintain a preset humidity level (from ambient to 0% ± 1.5% RH), no matter how operating conditions may change.
  • Laboratory Nitrogen Generator
    Terra’s Nitrogen Generators provide a continuous, reliable supply of clean, dry nitrogen up to 99% pure to eliminate dependence on bulky canisters to operate desiccators and glove boxes.
  • Desiccator Cabinet Ionizing Module
    Ionizing modules are available for desiccator cabinets, glove boxes and other enclosures to ensure static-safe storage and processing (shown: ionizing unit on 2-chamber desiccator)
  • Universal Adjustable Base Stands for Desiccator Cabinets and Cleanroom Equipment
    Stainless steel or powder-coated steel base stands easily adjust to fit cabinets, desiccators and cleanroom equipment of any size or shape. Stands raises equipment to ergonomic height to ease disinfection and sample monitoring. BioSafe design suitable for any cleanroom or lab environment.
  • Humidity and Temperature Data Logger
    Records storage conditions inside a Desiccator chamber-adjustable logging interval (hours to months), USB port for easy data download in several formats.
  • Clean, Dry, ESD-Safe Transport Solutions
    Configure BioSafe® cleanroom carts with built-in desiccator cabinets for highly sensitive biomedical materials. The nitrogen desiccator cabinet adds an extra layer of protection to provide a dry, inert environment. Amber acrylic filters out UV and blue light.

On a tight schedule? Choose FasTrak 24/7 Priority Service to help meet your critical schedule for Terra-manufactured products, either before or after your order is placed.*

  • FasTrak 24/7 provides a 24/7 commitment to meet the shipping date YOU specify, regardless of quoted lead times.
  • FasTrak 24/7 assigns a dedicated production team plus a dedicated senior expeditor working three shifts to meet your delivery specification.
  • FasTrak 24/7 guarantees* to meet the agreed-to specified ship date.

Call for pricing. FasTrak service fees cover costs of additional services only, without additional profit.

 * Terra's FasTrak services limited guarantee: to ship on the ESD or date specified OR to refund up to 100% of FasTrak charges. This guarantee covers no direct, special, consequential or other damages and is strictly limited to up to 100% of the amount paid for FasTrak service. When a specified ship date is missed due to factors outside Terra's control (vendor performance, deliveries by shipping companies, etc.) and random factors such as accidents, the credit of up to 100% of the FasTrak 24/7 may not apply. FasTrak service requested after order placement will be quoted and accepted based on available time remaining before required ship date.

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