Terra Part # 3950-36F-ISO
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Desiccator; IsoDry®, Acrylic, 10 Chambers, 46" W x 22.5" D x 60" H

• Desiccator cabinet with gas dilution fans for fast, uniform moisture removal, down to 0%RH

• Dilution fans quickly and efficiently mix nitrogen through cabinet to reduce N2 consumption

• Eliminates moisture "blind spots" that cause large RH deviations between different chambers

• Automatic humidity control system continuously monitors user-specified RH set-point inside cabinet

• Ideal for applications that permit chambers to share the same air throughout cabinet

• IsoDry® desiccator cabinets incorporate a unique, patented nitrogen purge system to achieve faster and more uniform low-humidity conditions throughout the cabinet.

• The desiccator cabinet also includes a moisture sensor that connects to a separate automatic RH control system to maintain sub-ambient, user-specified humidity threshold down to 0% RH.

How IsoDry® System Works:

• High-purity nitrogen gas feeds into the desiccator cabinet and is mixed by built-in fans with existing air inside the cabinet.

• The gas dilution fans continuously circulate and mix dry nitrogen throughout the cabinet to eliminate moisture “blind spots” and further dilute moisture present inside the cabinet.

• 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 a door is opened, or when the relative humidity (RH) climbs above set-point level, the system re-activates high-flow to accelerate moisture removal.

• All chambers within the cabinet share the same air and thus share the same humidity level of the cabinet (+/- 10% RH from set point).

• Grounding is not standard on all designs, choose static-control options/designs to protect sensitive materials against ESD.

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


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

• Economical clear acrylic construction provides full visibility of stored contents.

CAUTION: Acrylic is damaged by alcohol and many other cleaning agents. Use only water and mild detergent.

• 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.


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

• Doors include one-piece non-adhesive Santoprene® “e”-shape rubber gasket for tight seal to prevent outside air from leaking in; gaskets is non-outgassing and will not take a set or keep an impression.

• 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.

• Optional locking lift latches also available - specify one per chamber.

• 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.


• Gas dilution module requires connection to IsoDry® humidity controller for operation: either IsoDry® Dual Purge System and IsoDry® NitroWatch®, or IsoDry® Smart® Controller (order either system separately).


• (1) RH sensor and (1) gas dilution module. Gas dilution module (24V) and sensor are pre-installed and pre-wired for quick connection with Terra’s automatic humidity control systems: DualPurge and NitroWatch®.

• (2) Stainless steel racks and (1) automatic R/B valve per chamber.

• (1) Perforated stainless steel shelf; order additional shelves separately

• Use online System Builder to select other desired shelves, gas controllers, stand and accessories.

Chamber Dimensions: 22.125" W x 22.125" D x 11.625" H

Material: Acrylic

Opening Dimensions: 21.5" W x 10.75" H

Number of Chambers: 10

Model: IsoDry®

Design: Floor

Chamber Width: 22.125"

Chamber Depth: 22.125"

Chamber Height: 11.625"

Humidity Control: Cabinet Level + Dilution Fan

Door Design: Leak Tight

Unit of Measure: EA

Marks & Listings: CE, UL, ULC

Electrical Specifications: 12 V, 1 Ph, 50/60 Hz

Weight, Product: 207 lb

Dimensions, Product: 46" W x 22.5" D x 60" H

Weight, Shipping: 382 lb

Dimensions, Shipping: 51.5" W x 67.5" D x 28" H

Package Type: Crate

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  1. Provides variable gas purge levels to maintain humidity set points | 9500-05 displayed
    IsoDry® Dual Purge™, for Desiccator, 120/240VAC, 50/60Hz Stocked Item is in stock and ready for immediate shipping
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  2. Perforated Stainless Steel Shelf allows unimpeded airflow within the desiccator | 1610-42 displayed
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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. 304 Stainless steel solid-bottom tray with extra depth for desiccators 21.3" W x 14.5" D x 2.6" H, single-sided perforation | 1978-04 displayed
    Tray; Non-Perforated, 304 Stainless Steel, 21.3" W x 21.1" D x 2.6" H Stocked Item is in stock and ready for immediate shipping
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  6. Stainless steel shield, installed on the floor of a plastic desiccator chamber, protects against scratching | 1976-06 displayed
    Shield; Non-Perforated, 304 Stainless Steel, 21"W x 20"D Stocked Item is in stock and ready for immediate shipping
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  7. Large 4"H stainless steel desiccator stand; optional casters simplify positioning and cleaning | 1740-92 displayed
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  8. Large 12"H stainless steel desiccator stand; optional casters simplify positioning and cleaning
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  9. Large 4"H powder-coated steel desiccator stand; optional casters simplify positioning and cleaning | 1740-40 displayed
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  10. Large 12"H powder-coated steel desiccator stand; optional casters simplify positioning and cleaning
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  11. Small (4") locking latch, catcher included. Grid shows one-inch squares. | 1603-80 displayed
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  12. Stainless steel LiftLatch. Product details may differ. | 1603-67-2 displayed
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  13. Stores 16,382 temperature readings and 16,382 relative humidity measurements. | 9500-10 displayed
    Data Logger; Relative Humidity/Temperature Stocked Item is in stock and ready for immediate shipping
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  14. 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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  15. 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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  16. FasTrak 24-7 Expediting Service
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  17. UL Listing Declaration for Desiccators
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  18. Qualification Documentation (IQ/OQ) for Terra Universal System
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  19. Equipment Testing and Certification
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  20. Acrylic flow meter, valve-2-20SCFH | 1600-32 displayed
    Flowmeter Kit; for IsoDry Desiccator Stocked Item is in stock and ready for immediate shipping
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  21. One way-valve continuously bleeds gas to relieve pressure and release moisture-laden air | 1600-60A displayed
    Automatic RB Valve; for Polymer Gloveboxes, Black Stocked Item is in stock and ready for immediate shipping
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  22. Perforated Stainless Steel Shelf allows unimpeded airflow within the desiccator | 1610-42 displayed
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  23. 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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  24. Adjusts purge rate to maintain low humidity levels when doors are opened | 1600-49 displayed
    Sensor Switch; (Installed) Stocked Item is in stock and ready for immediate shipping
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  25. 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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IsoDry® Desiccator Cabinets

  • Desiccators: Features and Design overview
  • Leveling your Desiccator
  • 8-chamber Static-Dissipative PVC IsoDry® Desiccator Cabinet IsoDry® Desiccator Cabinet, 8-chamber static-dissipative PVC
  • 6-chamber static-dissipative PVC IsoDry® Desiccator Cabinet IsoDry® Desiccator Cabinet, 6-chamber static-dissipative PVC
  • IsoDry Desiccator Cabinet with Nitrogen Generator IsoDry Desiccators

Features and Benefits

IsoDry Explained

IsoDry Dual Purge/NitroWatch Systems

The complete IsoDry control system includes a relative humidity sensor mounted inside the chamber and a Terra's IsoDry Dual Purge and NitroWatch systems, which work in tandem to ensure fast set point recovery times (see graph above).

The Dual Purge system provides a high-volume burst of nitrogen to attain the RH set point upon system set-up. Once this set point is attained, it uses an economical low-flow purge to maintain the set point, and then activates the high-flow purge the minute a door opens to recover set point with minimal nitrogen waste. The NitroWatch provides continuous monitor/display of both measured RH and set point levels.

Status alerts built into the IsoDry Dual Purge System warn if incoming nitrogen line pressure falls below operational rates (signaling an interruption in the gas supply) or if the system remains in high-flow purge for an excessive period (signaling a door left ajar). This integrated system also provides the low-voltage power required by the IsoDry and a variable speed control for the dilution fans.

For smaller cabinets, a flowmeter kit provides an economical alternative to the automated Dual Purge/NitroWatch controller. The flowmeter kit includes a plug-in power supply for the gas mixing fans, but does not include set-point capability or RH monitoring.

What's Your Application?

The standard NitroPlex™ system provides unsurpassed moisture control in dozens of storage applications. Temperature, gas or biological sensors expand the range of critical operations.

  • Microelectronics components, surface-mount devices (SMDs), hybrid packages
  • Storage of printed circuit boards (PCBs) for rework
  • Pharmaceutical R&D studies
  • Kitting of high-precision watch components
  • Pass-through transfer of night-vision electronics
  • Lithium battery development
  • Humidity testing of cosmetics
  • Accelerated life testing of ICs
  • Animal inhalation and toxicology research

Which critical control application can you find in your facility?

Power Requirement24V: draws power from IsoDry Dual Purge System
Fans120 CFM each
Display5-digit LED
Display Resolution± 0.1%RH
Sensor Accuracy± 2% RH @ 20°C
Measuring Range0 - 100% RH
CalibrationNone required for standard accuracy range

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.

IsoDry Gas Dilution Module

IsoDry Gas Dilution Module enhances the relative humidity uniformity throughout the desiccator cabinet.

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.

High Caliber Hardware

Don’t be concerned about the quality, durability, and craftsmanship of your latches, ports, glides and hinges. Terra’s products are made of long lasting, cleanroom compatible, top tier hardware.

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

Gas Dilution System Ensures Uniform Humidity

IsoDry Gas Dilution Module enhances relative humidity uniformity throughout the desiccator cabinet and speeds up moisture removal after doors are closed.

Three-Chamber IsoDry Desiccator Cabinet

Available in three chamber sizes, these desiccators provide uniform gas distribution and reach humidity set-point quickly, ideal for moisture-sensitive samples; include racks for adjustable shelving.

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.

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.
  • Dual Purge and NitroWatch
    Terra’s Dual Purge and NitroWatch relative humidity controllers maintain a low-RH set-point inside a desiccator or glove box; they provide variable purge control that ensures continuous positive pressure and eliminates nitrogen waste.
  • NitroWatch Relative Humidity Sensor
    NitroWatch relative humidity sensor provides continuous moisture monitoring inside a desiccator or glove box.
  • Jumbo Display Hygro-Thermometer
    Digital temperature/humidity gauge is ideal for monitoring temperature and humidity.
  • Microwaveable Kleer-Vue Sorbent Box
    An alternative to nitrogen purging, these desiccant units contain indicating silica gel that turns from blue to pink as moisture is absorbed.
  • 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.

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 * 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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