Terra Part # 9500-06A-GB
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Terra Part # 9500-06A-GB
Request Quote
Usually ships in 5-9 business days

Want it faster ? Read about FasTrak

In stock
Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
Product Details
  • Available ISO Ratings: ISO 7, ISO 8
  • Smart humidity controller provides automatic setpoint control and data logging
  • Works in tandem with Terra's Dual Purge to maintain sub-ambient RH set-point down to 0% RH
  • Connects to a single sensor to monitor, control, and log data inside desiccator cabinet or glovebox
  • Logs RH, temp, purge on/off, and sensor removal/ attachment
  • Data file is .CSV with ~4MB or 113,000 readings; intervals of 1 SEC, 10 SEC, 1 MIN, 5 MIN, or 1 HR
  • Terra Universal's Smart® IsoDry® Nitro-Watch™ senses and displays the relative humidity level (from ambient to 0% RH) inside a desiccator or glove box within ±1.5% RH. It operates in tandem with Terra's Dual Purge™ System to precisely and automatically control the flow of nitrogen into a desiccator, glove box, or similar enclosure, and maintains a preset humidity level, no matter how operating conditions may change.
  • Programmable logic gives user complete control over warning alarms and other system functions.
  • Automatically controls Dual Purge™ System with high/low flow purges to maintain any relative humidity from 0% RH to room ambient.
  • Data Logging: Unlike the standard NitroWatch™, the Smart® NitroWatch™ also measures temperature and logs data. This system logs RH, temp, door open/close, purge on/off, and sensor removal/attachment. The system can log months of data depending on the logging interval selected, all of which can be downloaded to a USB flash drive. Plug in USB flash drive and system transfers data in .CSV format. No software required.
  • Application Note: The NitroWatch sensor provides an exact %RH reading in one chamber only. If multiple RB valves are installed and doors are frequently opened, this reading may not be representative of all chambers. For precise chamber-by-chamber monitoring and control in a desiccator cabinet, select Terra's NitroPlex system. For gloveboxes that require greater accuracy and control, Terra's DewWatch™ measures moisture volumes down to 0.5 PPM.
  • Requires: Dual Purge™ unit, Smart® NitroWatch™ sensor, automatic RB™ relief/bleed valves (order separately).

Accessories: Humidity/Moisture Control Systems

Control Type: Smart NitroWatch w/ Data Logging

Case Material: 304 Stainless Steel

Unit of Measure: EA

Marks & Listings: CE, UL, ULC

Electrical Specifications: 12 V, 0.25 A, 1 Ph, 50/60 Hz

Weight, Product: 20 lb

Dimensions, Product: 9" W x 5.5" D x 3" H

Weight, Shipping: 40 lb

Dimensions, Shipping: 14.5" W x 10" D x 7.5" H

Package Type: Box

Features and Benefits

Learn More: Nitrowatch Controller


  • Automatically controls Dual Purge™ System to maintain the desired low relative humidity level (2%RH to ambient) in a glove box or other enclosure
  • Reduces nitrogen costs by up to 78%
  • Continuously monitors and displays relative humidity level
  • Automatically compensates for shifting environmental variables, eliminating guesswork and reliance on supervisory personnel
  • New miniaturized sensor eliminates dead space inside glove boxes
  • Easy-program control functions

Purging a cabinet with nitrogen is an effective way to maintain a low-humidity storage environment. Using a flowmeter to control the nitrogen purge gas, however, causes unnecessary costs!

If you set the gas flow level too high, expensive nitrogen is wasted and cabinet seals are exposed to excessive pressure that could lead to leaks (or even ruptures!). If you set the flow level too low, you may wind up with ineffective contamination and moisture control and expensive component damage. Both problems have cost the semiconductor industry millions of dollars annually, simply because no adequate controller has been available.

Terra Universal's NitroWatch® solves these problems by sensing and displaying the relative humidity of an enclosed environment, such as a desiccator, Faraccator, or glove box. More importantly, it operates with the Dual Purge™ System to precisely control the flow of nitrogen into the enclosure and maintain a preset humidity level.

Operation is simple and reliable. Simply program the desired level, and then let the system do its job. The fast-response, capacitive-type sensor detects the relative humidity; the level is indicated on a 4-digit LED display. The NitroWatch® controls Dual Purge™ System operation to maintain the setpoint level—no matter how often doors are opened, or how large the system is, or what the ambient humidity is, or what time of the day or night. High-flow purges are initiated only when a door is opened or the humidity climbs above the set-point. The moment acceptable conditions are restored, the system returns to low-flow purging.

Additional Savings Through Reduced Nitrogen Waste

Higher quality control and reduced part rejects are two convincing reasons to consider the NitroWatch®. But they aren't the only ones.

Your biggest savings will probably come in reduced nitrogen expenses. Typically, the nitrogen flow in a desiccator cabinet is set at a level high enough to compensate for access to stored parts during working hours; this means that a constant high-level purge is required. Yet in most cases, doors remained closed for over 75% of the time! During off hours, weekends and holidays, unnecessarily high amounts of nitrogen are fed through the system and bled out as waste—even though no flow (or only a very minute flow) may be needed to maintain the appropriate internal humidity and positive pressure. Excess nitrogen bleeding can even endanger worker safety if ambient oxygen levels fall too low.

When you turn out the lights and lock the door, the NitroWatch® will cut out the nitrogen waste. This savings alone in most cases pays for the system within six months. Test data show typical savings of 78% of nitrogen consumption. And you'll be assured that stored components (and your workers) are safe.

Space-Saving Sensor

The NItroWatch sensor can be placed nearly anywhere inside a sealed enclosure without interfering with shelves, doors, process equipment, or stored materials. This sensor features miniaturized components that provide better than 3%RH accuracy over the 10%-90%RH range. Further, it never requires calibration.

The NitroWatch® controller comes complete with all necessary controls for monitoring the relative humidity level. For automatic humidity control, the unit must be connected to Terra's Dual Purge System. Order the NitroWatch®Sensor separately.

  • Dimensions: 11"W x 6.25"D x 3"H (279 mm x 159 mm x 76 mm)
  • Weight: 8 lbs. (3629 g)
  • Power: 12 VDC (provided by Dual Purge™ System)
  • Case Material: 304 Stainless steel
  • Output: 0-5 V
  • Measuring Range: .0-100%RH
  • Display Resolution: ±.1%RH
  • Temperature Dependence: ±.04%RH/°C
  • Measuring Range: 0-100%RH
  • Accuracy (at 20°C): ± 3%RH
  • Housing Material: 304 Stainless Steel
  • Calibration: None required.

Products Compliant With Your ISO Rating

Provide Terra with your desired ISO rating. We will tailor the product to meet your rating and supply a certificate of compliance appended to your invoice, to be included in your compliance package. All certificates are archived in Terra's system for quick retrieval.

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.

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements

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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