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• NitroPlex system provides chamber-by-chamber humidity control using individual RH sensors

• Built-in plenum distributes high-flow nitrogen to each chamber on-demand

• Multi-chamber cabinets isolate different types of stored materials

• Reduced impact on other chambers when one door opens

• Stainless steel racks installed in each chamber; shelves adjust in 1" increments

• Chrome-plated, ergonomic LiftLatches™ do not scrape the chamber like ordinary rotary latches

• Stainless steel-framed doors extend service life and provide a better door seal

• Mechanically attached, one-piece gasket does not creep or crack

• Automatic RB® Valves release moisture-laden air from the cabinet and prevent over-pressurization

• Electrical grounding available; specify when ordering (included standard on Static-Dissipative PVC models)

• Includes one NitroPlex Humidity Module per chamber, one automatic relief/bleed valve per chamber, and one perforated stainless steel shelf (order additional shelves separately)

General Purpose Desiccators

  • Adjust-A-Shelf Desiccators
  • Plastic Nitrogen-Purged Desiccator Cabinet with Automated Humidity Control NitroPlex Desiccators: Chamber-Level Humidity Control
Plastic Nitrogen-Purged Desiccator Cabinet with Automated Humidity Control

Features and Benefits

NitroPlex Explained

NitroPlex™ Multiplex Humidity Desiccators Overview

Terra’s NitroPlex™ Desiccator Control System optimizes nitrogen purge efficiency for the most demanding applications, when every second of moisture exposure counts.

The NitroPlex™ is the only humidity control system that combines the monitoring and control capabilities required in zero-tolerance applications with miniaturized semiconductor components, bio/pharmaceutical samples and other moisture-sensitive materials.

Chamber-by-Chamber Multiplexed %RH Monitor/Control

A separate high-accuracy, miniaturized humidity module in each desiccator chamber provides independent monitor/control capability. Each module can be programmed locally or remotely to maintain a humidity set point from ambient down to 0%RH.

Nitrogen is directed only where needed to keep the %RH level below the critical set point.

Cuts System Recovery Time to Seconds

Desiccators controlled by a flowmeter may require an hour or more to regain a humidity set point after a chamber access door is opened. When doors are opened repeatedly, humidity levels can remain above the critical set point for an entire work day.

Testing shows that the NitroPlex™ cuts this recovery time by over 400% in a 4-chamber desiccator (see sidebar below). In Terra's Microccator™ this recovery time is cut to a matter of seconds, eliminating moisture-caused damage.

Product Safety Alarm

The NitroPlex™ eliminates another common cause of moisture exposure: access doors mistakenly left open or ajar. The system directs a high-flow nitrogen purge to any chamber the moment its door is opened. If the door remains opened longer than a specified delay time, the NitroPlex™ issues warning alarms to alert personnel to the problem.

Performance Improvements Spell Big Savings
NitroPlex™ Cuts N2

Costs by over 75%, Improves Efficiency by 400% A desiccator with only one bleed valve may cause more harm than good.

Once an access door is opened, any moisture that enters a cabinet will tend to migrate from one chamber to the next until it exits the cabinet through a bleed valve. In a large, multi-chamber cabinet with only one bleed valve, the moisture may contaminate several chambers.

Even a desiccator equipped with Terra Dual Purge™ and NitroWatch® systems may require 40 minutes or more to purge the moisture and recover the desired humidity set point (see test results at right). In this test, the top chamber of a four-chamber desiccator was exposed to moisture until the humidity level reached 97%RH. Figure 1 (on graph) represents the desiccator efficiency when it was equipped with a single Automatic RB® Valve located in the bottom chamber. The system required 40 minutes to bring the humidity level down to the 10% set point.

If, during that period, another door is opened, this recovery time will be extended further. Very possibly, the cabinet might fail to reach its programmed RH set point over the course of an entire shift, or even longer.

Simply by installing Terra's Automatic RB® (Relief/Bleed) Valve in each desiccator chamber, you can cut both the system recovery time and the nitrogen consumption in half. This is the test case represented by Figure 2 on the graph. Only 20 minutes—and only half as much nitrogen--were required to bring the humidity level to the set point.

The final test case (Figure 3) included a NitroPlex™ control system. With this set up, the desiccator required only 10 minutes to bring the RH from 97% to the set point level of 10%—only a fourth the time required in the first test. It consumed only 15 cubic feet (.42 cubic meters) of nitrogen, only 13% of the amount used in the first test case.

This nitrogen saving alone, nearly 77% in this test, justifies investment in a NitroPlex control system.

Fan / Filter Units with HEPA Filter
Model Nominal
Avg. CFM 
@ MS
High speed Airflow
Medium speed Airflow
Low speed Airflow
High speed
Run Amps (watts)
@ 60Hz
Medium speed
Run Amps (watts)
@ 60Hz
Low speed
Run Amps (watts)
@ 60Hz
2 x 4 23.63 x 47.63 x 13
(600 x 1210 x 332)
2 x 3 23.63 x 35.63 x 13
(600 x 905 x 332)
2 x 2 23.63 x 23.63 x 13 
(600 x 600 x 332)

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.

Ergonomic LiftLatches

Lifting latch mechanism minimizes stress on wrists and desiccator hinges; non-rotary motion generates no particles inside the storage area (optional locking model shown)

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

NitroPlex Humidity Control Modules

NitroPlex systems feature individual humidity sensors with LED displays above each chamber door. Each sensor can be programmed with a different humidity set-point level.

Plenum Chamber Adds Strength and Uniform Gas Distribution

Perforated plenum wall strengthens cabinet, minimizes backfill, and ensures uniform gas distribution throughout all storage chambers

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.
  • LatchLock Stainless Steel Locking Bracket
    Increase security of any desiccator equipped with Terra’s standard door LiftLatch. Bracket allows addition of lock to prevent unauthorized users from accessing contents.
  • 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.
  • Desiccator Ionizing Module
    Ionizing modules are available for desiccators, glove boxes and other enclosures to ensure static-safe storage and processing (shown: ionizing unit on 2-chamber desiccator)
  • 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.

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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