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
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.
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.
Which critical control application can you find in your facility?
Specifications (IsoDry Humidity Control System)
See ordering chart below
24V: draws power from IsoDry Dual Purge System
120 CFM each
± 2%RH @ 20°C
0 - 100%RH
None required for standard accuracy range
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.
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.
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.
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.
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.