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™ ES™ Extended Storage 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:
  • 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 Design:
  • 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.
  • Door Design:
  • 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.

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: 130 lb

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

Package Type: Crate

Buy Accessories
  1. Smart® Module with LED display and gas inlet automatically monitors and maintains low-RH set point to conserve nitrogen | 1911-30B-VL displayed
    $1,700
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  2. Adjustable shelves support weight loads of up to 90 pounds. | 1976-04 displayed
    $282
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  3. Shelf supports ensure that this plastic chamber holds weight | 2200-21 displayed
    $128
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  4. Stainless Steel and powder-coated steel stands adjust to fit cabinets, desiccators and cleanroom equipment of any size. | 1609-20 displayed
    $616
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  5. Stainless Steel and powder-coated steel stands adjust to fit cabinets, desiccators and cleanroom equipment of any size. | 1609-20 displayed
    $616
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  6. Small 4"H stainless steel desiccator stand; optional casters simplify positioning and cleaning
    $616
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  7. Small 4"H stainless steel desiccator stand; optional casters simplify positioning and cleaning
    $616
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  8. All-in-one system features prefilters, nitrogen membrane, oil-free compressor, and gas cylinder. | 2700-11B-P displayed
    $11,733
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  9. Stores 16,382 temperature readings and 16,382 relative humidity measurements. | 9500-10 displayed
    $252
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  10. 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
    $10,969
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  11. Ideal for low-humidity storage or drying in facilities with no nitrogen source | 1900-01 displayed
    $518
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  12. Contain indicating silica gel that turns from blue to pink as silica gel absorbs moisture. | 2010-75 displayed
    $23
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  13. FasTrak 24-7 Expediting Service
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  14. Qualification Documentation (IQ/OQ) for Terra Universal System
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  15. Equipment Testing
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  16. UL Listing Declaration for Desiccator and Storage Cabinets
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  17.  | 1500-01 displayed
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  18. Displays internal temperature and relative humidity (one included on each cabinet)
    $66
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  19. Installed grounding terminal; location may vary depending on product | 1686-12 displayed
    $160
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ValuLine ES Plastic Desiccator Cabinets

  • Smart Module with LED Display for Relative Humidity Smart Module with LED Display
  • Desiccators: Features and Design overview
  • ValuLine™ Desiccators from Terra Universal
  • Two plastic desiccator cabintes in a municipal water treatment facility ValuLine™ ES Desiccators in Water Treatment Plant

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

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.

Smart Module with LED Display

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

ValuLine™ Plastic Desiccator Cabinet

Terra's nitrogen 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.

Highest Standards For Desiccators and Electronic Components

Terra’s desiccator cabinets and RH control systems are designed and built to the highest standards required by defense and semiconductor industries for long-term reliability and protection against damage, injuries, and electrical hazards.

Continuous Product Improvement

At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.

Long-Term Customers

Terra is committed to building long-term relationships with satisfied clients; 94% of orders each year come from repeat customers

Complete Project Transparency

Terra is dedicated to complete transparency on project status, shipment tracking, and installation scheduling

Smart® Desiccator Cabinet on Automatic Height Adjustable Workstation

Automatic height adjusting workstations allow users to quickly alternate between comfortable sitting and standing positions while performing different tasks with heavy equipment on the workspace, such as this Smart® Desiccator Cabinet connected to a Nitrogen Generator.

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.
  • Compact Portable N2 Generator for Laboratory Use

    The compact enclosed cabinet reduces noise levels to 60dB measured from 3ft away.
  • 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.
  • 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.
  • 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.
  • Smart Module with LED Display

    Upgrade your desiccator to an automatic nitrogen control system with Terra's economical, programmable Smart Module.
  • 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.
  • 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)
  • Relief-Bleed Valve

    One way-valve relieves pressure and releases moisture-laden air

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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