Terra Part # 3949-32C
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Desiccator; ValuLine™ ES™, Static Dissipative PVC, 3 Chambers, 19.125" W x 16" D x 37.25" H

• Low cost desiccator cabinet designed for long-term, low-throughput dry storage

• Extended Storage™ design is ideal for long-term storage that doesn't require frequent parts access

• Optional Smart® module automatically monitors RH in cabinet for faster RH recovery and less N2 waste

• Perfect for cleanroom, lab, or stockroom use where recovering low-humidity set-point is not critical

• Also suitable for use with silica bead desiccant or simply for clean particle-free storage

• Terra’s ValuLine™ Extended Storage (ES™) desiccator cabinets combine low cost and strength for long-term dry storage that doesn't require rapid recovery or critical low-humidity set-points.

NOTE: Cabinet design not recommended for applications with frequent parts access, or those requiring fast RH recovery rates.

• Built-in digital thermohygrometer displays internal temperature and RH to help monitor conditions.

Optional Accessories:

• Optional Smart® humidity control module automatically monitors and displays relative humidity in the cabinet for faster set-points and improved efficiency with reduced consumption of nitrogen gas. Requires Automatic RB™ (relief/bleed) valve, sold separately.

• Alternatively, a flowmeter and Automatic RB™ (relief/bleed) valve allow for manual control of nitrogen gas.

• Other optional accessories sold separately: data logger, silica desiccant, removable shelves, stand, casters.

Cabinet:

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

• Slotted chambers help circulate and mix dry nitrogen throughout the cabinet to minimize moisture “blind spots” and further dilute moisture present inside the cabinet.

• Built-in shelf rack systems allow for high-capacity, organized storage (removable shelves sold separately).

• Includes port for installing Terra flowmeter (order separately).

• Transparent walls help quickly find items anywhere inside the cabinet.

ESD-Safe Design:

• Static-dissipative PVC (SD-PVC) design features bonded dissipative layers that resist abrasion; retains 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.

• SD-PVC also has increased chemical resistance to withstand frequent wipe-downs with alcohol and other strong cleaning agents.

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

Doors:

• Reinforced doors include exterior stainless steel plating plus stiffening bars on the inside of the doors to increase rigidity for a longer service life.

• Cleanroom compliant design includes corrosion resistant, non-particle shedding hardware:

Self-closing 316L stainless steel hinges with superior corrosion resistance help both hold open and tightly close doors.

Swell latches open/close with the flick of a finger to save wrist strain. An expanding rubber bushing firmly seals doors to prevent dust and moisture from leaking in.

• Closed-cell foam gasket around each reinforced door provides a superior protective seal to prevent air, vapor, moisture, water, and dust infiltration; resists weathering, UV oxidation, mildew and fungus.

Includes:

• (1) Digital thermohygrometer (expressed in degrees F).

• (2) Chrome plated racks per chamber.

• (1) Terminal block on top of cabinet for easy grounding and electro-static protection.

Chamber Dimensions: 16.625" W x 15.125" D x 11.75" H

Material: Static Dissipative PVC

Opening Dimensions: 16.375" W x 10.75" H

Number of Chambers: 3

Model: ValuLine™ ES™

Design: Benchtop

Chamber Width: 16.625"

Chamber Depth: 15.125"

Chamber Height: 11.75"

Humidity Control: Cabinet Level

Door Design: ValuLine

Unit of Measure: EA

Marks & Listings: CE, UL, ULC

Weight, Product: 42 lb

Dimensions, Product: 19.125" W x 16" D x 37.25" H

Weight, Shipping: 115 lb

Dimensions, Shipping: 25" W x 45" D x 22" H

Package Type: Crate

Buy Accessories
  1. Acrylic flowmeter. Product details may differ | 1600-31 displayed
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  2. Smart Module with LED display and gas inlet automatically monitors and maintains low-RH set point to conserve nitrogen | 1911-30B-VL 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. Stainless Steel solid desiccator shelf with lip | 1976-05 displayed
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  6. Adjustable shelves support weight loads of up to 90 pounds. | 1976-04 displayed
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  7. Small 4"H powder-coated steel desiccator stand; optional positioning and cleaning
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  8. Stores 16,382 temperature readings and 16,382 relative humidity measurements. | 9500-10 displayed
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  9. Portable Nitrogen generator 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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  10. Ideal for low-humidity storage or drying in facilities with no nitrogen source | 1900-01 displayed
    Tray; Renewable, 304 SS, 15" W x 15" D x 1" H for DesiTray™ Stocked Item is in stock and ready for immediate shipping
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  11. Contain indicating silica gel that turns from blue to pink as silica gel absorbs moisture. | 2010-75 displayed
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  12. FasTrak 24-7 Expediting Service
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  13. Qualification Documentation (IQ/OQ) for Terra Universal System
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  14. Equipment Testing and Certification
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  15. UL Listing Declaration for Desiccators
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  16.  | 1500-01 displayed
    Rack, Storage Chamber, Chrome-Plated Steel, 12''W x 7.5''H x 13/16''D Stocked Item is in stock and ready for immediate shipping
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  17. Displays internal temperature and relative humidity (one included on each cabinet)
    Thermohygrometer, Digital, Mini, Fahrenheit Temp Display; Installed Stocked Item is in stock and ready for immediate shipping
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  18. Installed grounding terminal; location may vary depending on product | 1686-12 displayed
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ValuLine™ ES™ Desiccator Cabinets

  • Desiccators: Features and Design overview
  • Smart Module with LED Display for Relative Humidity Smart Module with LED Display
  • ValuLine™ Desiccators from Terra Universal

Features and Benefits

Desiccator Essentials FAQ

Desiccator Cabinet Frequently Asked Questions

What is a desiccator cabinet and how is it used?

The term “desiccator” commonly refers to two types of equipment and ranges of applications.

A desiccator cabinet is typically a larger unit, often with multiple chambers, used to prevent moisture exposure during storage of sensitive parts. Because storage applications must allow periodic parts access, a desiccator cabinet typically includes one or more doors and relies either on a desiccant material (regenerating silica gel or molecular sieve) or the use of inert Nitrogen gas to maintain dry conditions. Terra offers desiccator cabinet options for every application.

A desiccator, on the other hand, is a sealable drying enclosure that uses vacuum or desiccant, sometimes in conjunction with a fan, to remove moisture adsorbed into the surface layer of a sensitive sample. These sealable enclosures are typically fairly small cylindrical or round glass vessels and are commonly used in laboratories to dry biological, pharmaceutical, or other chemical samples. Terra offers a wide selection of vacuum and non-vacuum lab desiccator options.

What are the advantages of a Nitrogen purged desiccator cabinet?

Purging a desiccator cabinet involves flushing moisture and oxygen laden air out of the cabinet using a steady flow of dry inert gas, such as Nitrogen. A purge of purified 99%+ Nitrogen gas is generally preferred in a large desiccator cabinet because such systems achieve a uniformly low-humidity storage environment more quickly than desiccant-based systems, particularly where ultra-low RH levels are required. Nitrogen can be fed into multiple locations in a large cabinet, often using a rear plenum as a distribution chamber. A mixing fan can be added to increase humidity uniformity inside the cabinet and promote moisture dilution. Nitrogen purged desiccators also prevent contact with oxygen, making them ideal for anaerobic applications.

A desiccant based dry cabinet is often prefered in facilities that lack a Nitrogen source. However, because desiccant requires a periodic regeneration (heating) cycle, these desiccators cannot provide continuous moisture protection unless equipped with a redundant desiccant module. They are also typically unable to provide ultra-low humidity levels and require a longer RH recovery time when the cabinet is exposed to moisture.

What is RH recovery time?

RH recovery time is the time required to recover a low relative humidity set point when an access door is opened to part retrieval.

The acceptable RH set point depends on industry and application. Many semiconductor and optical sensing devices feature electronics that require a storage environment of less than 10%RH and are degraded by exposure of just a few minutes to moisture substantially above this level. Unfortunately, depending on size of the cabinet and drying system, some desiccators can require up to an hour to retain a 10%RH set point, particularly if ambient humidity is very high. If a door is opened again before set point is attained, parts may be exposed to unacceptable moisture levels for hours!

For critical applications, Terra provides a number of high-efficiency Nitrogen purged desiccator cabinets, including the IsoDry desiccator cabinet, which ensures RH uniformity and fast recovery time. In large, multi-chamber desiccators, Terra’s NitroPlex system provides automatic humidity control in each chamber independently.

Improved low-RH recovery also reduces Nitrogen costs.

How much Nitrogen does a desiccator use?

Equipped with an automated gas control system, such as Terra’s Dual Purge and NitroWatch controllers, desiccator cabinets consume on average less than five cubic feet of Nitrogen per hour, allowing a single 5’ pressurized liquid Nitrogen tank to operate a large cabinet continuously for 2-3 days, depending on frequency of access and recovery time.

To eliminate dependence on Nitrogen tanks, Terra offers Nitrogen generator options to produce up to 99.5% pure medical grade Nitrogen from compressed air.

How can a desiccator cabinet prevent static-related problems like electro-static discharge?

Even the slightest static discharge can spell disaster for delicate electronic or semiconductor components. Furthermore, dangers of ESD (electrostatic discharge) are amplified in a low humidity environment. Below are a few options to consider to help create an ESD safe storage environment:

  1. Static-Dissipative PVC: Acrylic, a low cost plastic 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 non contaminating—with no measurable outgassing—and it resists a wide range of chemicals.
  2. 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.
  3. Stainless Steel Conductive Shelves, Shields and Trays: 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. Terra’s ESD safe desiccator cabinet utilizes this Faraday design to provide complete ESD shielding for sensitive electronics storage.
What are the disadvantages of a plastic desiccator?

Creating a low-humidity environment requires careful material choice. An acrylic desiccator cabinet for example can be a lower cost option but bears a weakness known as hygroscopy. Plastic surfaces naturally accumulate liquid molecules through adsorption, collecting moisture from the atmosphere that clings to its surface in a thin coat. While this might not present an issue for simple operations, it can be a challenge in moisture-sensitive applications.

A potential solution to the issue of humidity in small acrylic enclosures, such as glove boxes and desiccators, is the use of nitrogen gas. Nitrogen is a dry inert gas commonly pumped into a chamber to lower the relative humidity and purge moisture to protect the materials inside. But constantly using a high flow of Nitrogen gas can be expensive, and for critical applications requiring minimal humidity, compensating for an inherently moisture-attractive material can expend a ghastly amount of N2.

Storage of large or heavy materials exceeding 100+lbs can sometimes be a challenge with plastic desiccator cabinets. The individually partioned chambers in the cabinet can make it difficult to fit very wide or tall items into the cabinet. Plastic desiccator cabinets also have a lower overall weight capacity, so they are generally less suitable for storage of materials exceeding 100lbs. Stainless steel desiccator cabinets offer solutions to both size and weight capacity constraints of plastic desiccator cabinets.

What are the advantages of a stainless steel desiccator cabinet?

Regardless of the type of gas blowing across acrylic, air cannot dislodge moisture particles from its surface or prevent air and liquid molecules from permeating the glued edges of an acrylic chamber. For applications requiring the strictest low-humidity environments, stainless steel provides moisture-impermeable protection as well as corrosion and chemical resistance. And while stainless steel will protect the atmospheric conditions of the environment within the chamber, optional properties for steel types can provide further benefit.

The best resistance to humidity comes from electropolishing, a procedure that removes the top layer of the stainless steel surface. The process entails an electrochemical removal of metal impurities, including carbon, silica and free iron, and it leaves a highly reflective nickel and chromium surface. Electropolishing eliminates the grainy texture of standard stainless steel, which can retain trace amounts of moisture or pathogens that escape cleaning. As a result, the surface has a smooth texture at a microscopic level, and liquid molecules have nowhere to hide.

Stainless steel desiccator cabinets are also ideal for heavy duty storage applications of large, bulky materials. For example, large pieces of equipment or heavy drums of raw materials. Desiccator cabinets with double doors provide extra-wide openings for large items. The shelving inside can also be reinforced and fitted with welded heavy duty shelves for increased weight capacity of 300lbs or more.

What applications use desiccators?
Semiconductors

Terra manufactures desiccators specially configured for ICs, tote boxes, IC carrier reels, and other common microelectronics and electronics parts. Not only does desiccator storage eliminate damage that can be immediately detected, but it also prevents “dwell effect” – the more costly damage that doesn’t emerge until ICs or other components are installed in more complex assemblies, such as medical devices, that are more difficult to repair or replace.

Chemical Samples

Desiccators provide an inert gas environment for storing volatile chemicals. They can also be used for slow, controlled drying, and are available with customized heating capabilities. Use of a nitrogen or other inert process gas eliminates reactions caused by oxygen exposure.

Biological Samples

The dry, inert environment inside a desiccator is ideal for storage of forensic materials, DNA samples, and biological cultures. Easy-clean BioSafe® stainless steel desiccator cabinets are ideal for use with materials that require a sterile environment.

Pharmaceuticals

Dry storage inhibits growth of organic contaminants and retards other chemical reactions that degrade pharmaceuticals.

Many More!

Clean, dry storage environments for everything from archival records to archeological samples—call to discuss your application!

Stainless Steel-Reinforced Doors

Stainless steel reinforcing bar provides added rigidity and durability to plastic doors.

Thermohygrometer

Displays internal temperature and relative humidity (one included on each cabinet).

Closed-Cell Door Gasket on Reinforced Door

Closed-cell door gasket maintains internal positive pressure when purged with dry gas, and stainless steel reinforcements extend door life

Static-Dissipative PVC Plating

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.

Smart Module with LED Display

In minutes, upgrade your ValuLine desiccator to an automatic nitrogen control system with Terra's economical Smart module.

ValuLine™ Desiccator Cabinets

Clearly surpass any manufacturer's design quality, contamination control, and availability. Easily upgrade to an automatic nitrogen control system with Terra's Smart module.

Self-Closing 316L Stainless Steel Hinges

Self-closing 316L stainless steel hinges use springs to both hold open and help tightly close doors. Stainless steel drastically extends service life and minimizes corrosion, flaking, and contamination that commonly occur with ordinary chrome-plated hinges.

Cleanroom Compliant Swell Latches

Swell latches open/close with the flick of a finger to save wrist strain. An expanding rubber bushing firmly seals doors to prevent dust and moisture from leaking in, plus eliminates corrosion, flaking, and particle contamination from chrome-plated latches.

Stainless Steel Storage Racks

Stainless steel racks resist chipping and scratching from sliding or removable shelves, won't produce contaminants

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.
  • Humidity and Temperature Data Logger
    Provides a convenient record of storage conditions inside a Desiccator chamber-adjustable logging interval (hours to months), USB port for easy data download in several formats.
  • Flowmeter, 1-10 SCFH, 2'' scale
    Suitable for total pressures up to 100 psig and temperatures up to 150°F.
  • Smart Module with LED Display
    Upgrade your desiccator to an automatic nitrogen control system with Terra's economical, programmable Smart Module.
  • 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)
  • 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.
  • Small Powder-Coated Steel Desiccator Stand, 4"H
    Small 4"H powder-coated steel desiccator stand adjusts to fit cabinet snugly; optional casters simplify positioning and cleaning. Also available in stainless steel and 12" height.
  • Relief-Bleed Valve
    One way-valve relieves pressure and releases moisture-laden air

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