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IsoDry® Desiccator Cabinets
Patent Pending

NitroPlex Desiccator
No. 3950-36D-ISO, shown with IsoDry Humidity Controllers,
castered stand, shelves and Nitrogen Generator (order separately)
Features Key

A Gas Mixing Module
B Relief/Bleed (RB) Valve
C IsoDry Control Systems allow set-point programming and display
D Relative humidity sensor
E Stands available with casters for easy cabinet positioning
F Nitrogen Generator provides a continuous, reliable source of nitrogen up to 99% pure
G Doors reinforced with stainless-steel frames
H Electropolished stainless-steel perforated shelf (1)
I Electropolished stainless-steel solid shelf
Flowmeter kit with fittings and gas-dilution power supply (not shown)
humidity level critical
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IsoDry Gas Dilution Module enhances relative humidity uniformity throughout
the desiccator cabinet
RH sensor provides continuous moisture monitoring

    Terra’s IsoDry Desiccators provide key performance improvements for your most critical humidity requirements:

  • RH Uniformity: Fans mix chamber gas with pure nitrogen to maintain uniform RH percentage throughout the cabinet, eliminating moisture “blind spots” that can degrade sensitive components. All chambers within a cabinet maintain the same humdity level (+/- 10% of set point - see chart below).
  • Continuous RH monitor/display: IsoDry sensor monitors the relative humidity percentage inside the cabinet
  • Low-Humidity Set Point Control: IsoDry control system lets you establish a sub-ambient set point to protect moisture-sensitive parts
  • Fast Recovery Time: IsoDry gas-flow engineering ensures that any moisture that enters the cabinet when doors are opened is quickly and efficiently diluted and purged from the cabinet, before it can affect stored contents
  • Versatile Applications: IsoDry technology can be built into any standard Terra desiccator
8-chamber static-dissipative PVC cabinet,
No 3950-00D-ISO

IsoDry Desiccators provide state-of-the-art, patent-pending humidity-control technology to reduce moisture-related degradation of semiconductor components, electronics, medical devices, pharmaceutical powders, and other sensitive materials.

Each cabinet employs a gas mixing module that continuously dilutes moisture with clean, dry nitrogen. A variable-flow humidity control system initiates a high flow of pure nitrogen the second an access door is opened or the internal environment exceeds the user-programmed sub-ambient humidity set point. As pure nitrogen enters the cabinet, moisture are is released through an Automatic Relief/Bleed valve in each chamber. Once doors are closed and the system recovers set-point conditions, the system reverts to an economical low-flow purge (adjustable via the system flowmeter) to conserve nitrogen.

Extensive testing demonstrates how this design produces superior RH uniformity and recovery times.

IsoDry Desiccators include reinforced stainless-steel-framed doors, one automatic RB (Relief/Bleed) valve per chamber, flowmeter kit with gas dilution power supply, electropolished (EP) stainless-steel wire racks, and one EP stainless-steel perforated shelf.

Flow meter module No. 1600-32-ISO (included)
allows manual purging of cabinets of
any size or chamber configuration
Smart module No. 1911-30B-ISO provides
low-cost alternative control system for
benchtop (3-chamber) cabinets only
Recirculation module ensures humidify uniformity throughout the cabinet.

IsoDry Dual Purge/NitroWatch Systems
These controllers include 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 provide the low-voltage power required by the IsoDry and a variable speed control for the dilution fans.

IsoDry Smart Humidity Module
This economical system provides relative-humidity set point monitoring and set-point control in 3-chamber benchtop cabinets. It includes a power supply for the Gas Mixing Module fans. Because it provides lower flow rates than the Dual Purge/NitroWatch systems, it is not suitable for use with cabinets containing more than three chambers or for applications that that require RH set points below 15% RH. See chart with comparative purge times.

Flowmeter Control
A flowmeter control system provides purging for non-critical humidity requirements without automated set-point control. This system includes a 0 – 20 SCFH flowmeter, mounting hardware, and the power supply for the Dilution Module fans. It is suitable for use in cabinets of any size or chamber configuration.

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?

Specifications (IsoDry Humidity Control System)
Dimensions: See ordering chart below
Power Requirement: 24V: draws power from IsoDry Dual Purge System
Fans 120 CFM each
Display: 5-digit LED
Display Resolution: ± 0.1%RH
Sensor Accuracy: ± 2% RH @ 20°C
Measuring Range: 0 - 100% RH
Calibration: None required for standard accuracy range
Ordering Information
IsoDry Cabinet Includes gas dilution module and Automatic Relief/Bleed Valve. Select from ordering chart below, which contains several popular sizes, or add “-ISO” to the part number of any applicable Terra desiccator.
IsoDry Control Systems Dual Purge/NitroWatch systems offer faster low-RH recovery; Smart Humidity Module combines low cost and simplicity. See comparison above.


Provides variable-purge flow of nitrogen to speed up set-point recovery and minimize nitrogen waster. Cat# Price
IsoDry Dual Purge System 9500-05 Price
IsoDry NitroWatch System 9500-06 Price
IsoDry Smart Humidity Module
(For 3-chamber cabinets only)
1911-30B-ISO Price
IsoDry Flowmeter Kit Replacement 1600-32-ISO Price
Relief/Bleed Valve Replacement 1600-60B $ 104
IsoDry RH Sensor (installed) 9500-02A Price
Other Options See chart below for shelves and stands.

three chamber

four chamber

five chamber
Three Chambers Four Chambers Five Chambers

six chamber

eight chamber

ten chamber
Six Chambers Eight Chambers Ten Chambers
IsoDry Desiccators
Specifications IsoDry Desiccators
Overall Dim.
W" x D" x H"
Static Dissipative PVC Clear Acrylic
Cat. # Price Cat. # Price
A1 24 x 25 x 36
(610 x 635 x 914)
3 Chambers 3950-12D-ISO Price 3950-42D-ISO Price
A2 17 x 19 x 36
(432 x 483 x 914)
3 Chambers 3950-13D-ISO Price 3950-43D-ISO Price
A3 24 x 19 x 36
(610 x 483 x 914)
3 Chambers 3950-14D-ISO Price 3950-44D-ISO Price
B1 24 x 25 x 48
(610 x 635 x 1219)
4 Chambers 3950-15D-ISO Price 3950-45D-ISO Price
B2 17 x 19 x 48
(432 x 483 x 1219)
4 Chambers 3950-16D-ISO Price 3950-46D-ISO Price
B3 24 x 19 x 48
(610 x 483 x 1219)
4 Chambers 3950-17D-ISO Price 3950-47D-ISO Price
C1 24 x 25 x 60
(610 x 635 x 1524)
5 Chambers 3950-18D-ISO Price 3950-48D-ISO Price
C2 17 x 19 x 60
(432 x 483 x 1524)
5 Chambers 3950-19D-ISO Price 3950-49D-ISO Price
C3 24 x 19 x 60
(610 x 483 x 1524)
5 Chambers 3950-20D-ISO Price 3950-50D-ISO Price
D1 45 x 21.5 x 36
(1143 x 546 x 914)
6 Chambers 3950-00D-ISO Price 3950-30D-ISO Price
D2 34 x 15.5 x 36
(864 x 394 x 914)
6 Chambers 3950-01D-ISO Price 3950-31D-ISO Price
D3 45 x 15.5 x 36
(1143 x 394 x 914)
6 Chambers 3950-02D-ISO Price 3950-32D-ISO Price
E1 45 x 21.5 x 48
(1143 x 546 x 1219)
8 Chambers 3950-03B-ISO Price 3950-33D-ISO Price
E2 34 x 15.5 x 48
(864 x 394 x 1219)
8 Chambers 3950-04D-ISO Price 3950-34D-ISO Price
E3 45 x 15.5 x 48
(1143 x 394 x 1219)
8 Chambers 3950-05D-ISO Price 3950-35D-ISO Price
F1 45 x 21.5 x 60
(1143 x 546 x 1524)
10 Chambers 3950-06D-ISO Price 3950-36D-ISO Price
F2 34 x 15.5 x 60
(864 x 394 x 1524)
10 Chambers 3950-07D-ISO Price 3950-37D-ISO Price
F3 45 x 15.5 x 60
(1143 x 394 x 1524)
10 Chambers 3950-08D-ISO Price 3950-38D-ISO Price

Nitrogen generator Nitrogen Generators give you a reliable point-of-use supply of up to 99%-pure nitrogen. Eliminate the drawbacks of canisters and 3rd-party suppliers! You control volume, purity and rate; all you need is a clean compressed-air feed. Terra's three sizes of maintenance-free membrane generators meet several capacity requirements are are ideal for back-filling or continuous flow into desiccators, glove boxes, vacuum chambers and incubators. 


IsoDry Stands: all Stands are 4" (102 mm) high
Desiccator Type Stand Dimensions W x D (mm) Stainless Steel Powder-Coated Steel
Cat. # Price Cat. # Price
A1, B1, C1 24.65" x 25.38"
(626 x 645)
1740-44-ISO Price 1740-28-ISO Price
A2, B2, C2 17.65" x 19.38"
(448 x 492)
1740-48-ISO Price 1740-32-ISO Price
A3, B3, C3 24.65" x 19.38"
(626 x 492)
1740-52-ISO Price 1740-36-ISO Price
D1, E1, F1 45.65" x 21.88"
(1160 x 556)
1740-92-ISO Price 1740-40-ISO Price
D2, E2, F2 34.65" x 15.88"
(880 x 403)
1740-94-ISO Price 1699-10-ISO Price
D3, E3, F3 45.65" x 15.88"
(1160 x 403)
1740-96-ISO Price 1700-10-ISO Price
Perforated Stainless Steel Shelves
Cat. # Price
1978-02 Price
Don't risk operational delays because of a damaged door! Terra's desiccators last indefinitely. Doors, however, are subject to damage, and ordering a legacy replacement can be costly and disrupt operation. To avoid these problems, order replacements at the time you purchase the desiccator; simply add "-RH" (for right-side hinge) or "-LH" (for left-side hinge) to the part number of the chamber.
RH/Temperature Data Logger
RH/Temperature Data Logger
Provides a convenient record of storage conditions! Placed in a desiccator or glovebox, this compact device accumulates humidity and temperature data at specified intervals for hours, days, weeks, even months. USB connection lets you import and display data in several formats.
Cat. # Price
9500-10 Price

File Type File Name Publication Date
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.
Manual (PDF) IsoDry™ RH Control Systems: Doc. #1788-26
This manual is a supplement to Doc. #1800-40 and provides installation and operating instructions for the IsoDry RH Control System.
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