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IsoDry® Desiccator Cabinets
Patent Pending

NitroPlex Desiccator  
Features Key

A Dilution Module
B Relief/Bleed Valve
C IsoDry Control Systems allow set-point programming and display
D Relative humidity sensor
F Stands available with casters for easy cabinet positioning
G Nitrogen Generator provides a continuous, reliable source of 99.5% pure nitrogen
humidity level critical
No. 3950-42B-ISO, shown with IsoDry Humidity Controllers, castered stand, shelves and Nitrogen Generator (order separately)
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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: Gas dilution module mixes 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

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 dilution module that continuously mixes the internal environment 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. Nitrogen efficiently dilutes and purges moisture from the cabinet, quickly restoring set-point conditions before moisture can affect stored parts. 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.

6-chamber static-dissipative PVC cabinet, No.3950-03-ISO
Smart module provides low-cost alternative control system (order below)
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 a small, economical package. It includes a power supply for the Humidity Dilution Module fans and provides a lower maximum flow rate than the Dual Purge system above, making it ideal for applications that do not require RH set points below 15% RH or frequent parts access. See comparative purge times below.

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.

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, SMDs, hybrid packages
  • Storage of 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 1911-30B-ISO Price
IsoDry Flowmeter Kit 1600-32_ISO Price
IsoDry RH Sensor (installed) 9500-02A Price
Door Sensor Switch
(installed, one/door required)
1600-49 Price
Other Options See chart below for door frames, 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
A 22.625 x 24.7 x 36
(575 x 627 x 914)
Three Chambers 3950-12C-ISO Price 3950-42C-ISO Price
B 22.625 x 24.7 x 48
(575 x 627 x 1219)
Four Chambers 3950-15C-ISO Price 3950-45C-ISO Price
C 22.625 x 24.7 x 60
(575 x 627 x 1524)
Five Chambers 3950-18C-ISO Price 3950-48C-ISO Price
D 45 x 22.5 x 36
(1143 x 572 x 914)
Six Chambers 3950-00C-ISO Price 3950-30C-ISO Price
E 45 x 22.5 x 48
(1143 x 572 x 1219)
Eight Chambers 3950-03B-ISO Price 3950-33C-ISO Price
F 45 x 22.5 x 60
(1143 x 572 x 1524)
Ten Chambers 3950-06C-ISO Price 3950-36C-ISO Price
Corresponding Accessories
Chamber Style
(see chart above)


304 Stainless
Steel Door Frames
Corresp. Stainless
Steel Shelves
Corresp. Stands
(leveling feet incl.)
Select appropriate quantity
for your desiccator
Perforated Shelf Stainless Steel
4" (102 mm) High
Cat. # Price Cat. # Price Cat. # Price
A, B, C 2200-60A Price 1978-02 Price 1740-44 Price
D, E, F 2200-30A Price 1978-02 Price 1740-92 Price
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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