Terra Part # 9500-05A
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Terra Part # 9500-05A
Usually ships in 1-3 business days

Want it faster ? Read about FasTrak

Quick Ship+ Available In stock
Product Details
  • Available ISO Ratings: ISO 7, ISO 8
  • Operates with any standard Terra Universal desiccator.
  • Programmable logic gives user complete control over warning alarms and other system functions.
  • Ensures a constant positive pressure inside desiccators to block contamination and moisture inflow.
  • Automatically activates a high-flow purge when access doors are opened to ensure fast, effective purging of particles and moisture.
  • Emits an audible/visible alarm when line pressure falls below the preset level.
  • Sensor Switches required for control (order separately).
  • Includes low pressure alarm with LED indicator, 0-20 SCFH flowmeter, line pressure display, pressure regulator and open door alarm.
  • UL-Listed - manufactured to the highest standards to reduce the risk of damage, injuries, and electrical hazards.
  • Flowmeter, 0-20 SCFH, Pressure gauge: 0-60 PSI, Chamber sensor: 0-4" WG, factory set to 0.02" WG.

Accessories: Humidity/Moisture Control Systems

Control Type: Dual Purge

Data Logging: No

Temperature Reading: No

RH Accuracy: N/A

Available ISO Ratings: ISO 7, ISO 8

ISO Class: ISO 7

Unit of Measure: EA

Marks & Listings: CE, UL, ULC

Electrical Specifications: 120/240 V, 0.5 A, 50/60 Hz

Weight, Product: 20 lb

Dimensions, Product: 12" W x 11.25" D x 7" H

Weight, Shipping: 40 lb

Dimensions, Shipping: 15" W x 14" D x 10" H

Package Type: Box

Features and Benefits

Learn More: Dual Purge and NitroWatch Systems

Dual Purge™ and NitroWatch™ System

  • Cuts nitrogen waste, guards against oxidation
  • Ensures a constant positive pressure inside desiccators and other enclosures to block contamination and moisture inflow
  • Automatically activates high-flow purge when doors are opened to ensure fast, effective purge of particles and moisture
  • Operates in tandem with NitroWatch® to maintain any desired sub-ambient moisture level (down to 0% RH)
  • Guards against pressure damage to desiccator doors and seals
  • Door switches are highly reliable—rated for over 10 million operations

Desiccators must be continuously purged with nitrogen or another process gas in order to ensure a controlled environment free of contaminants and moisture.

Unfortunately, however, a steady gas inflow can't guarantee the clean, dry conditions you require. A flow adequate to maintain a safe internal positive pressure when doors are closed is insufficient to overcome the backflow of outside air that occurs when a door is opened. A higher-level purge that might guard against this backflow wastes nitrogen and leads to over-pressurization that warp doors and damage seals.

Dual Purge System Offers Variable-Purge Security
Diagram of automatic humidity control system on a desiccator cabinet

The Desiccator Dual Purge System solves these problems by providing a higher flow level only when it's needed, and only for as long as it's needed.

It relies on a sensor switch installed on each door. During normal operation, with all doors closed, the system maintains an economical low flow of nitrogen into the desiccator to ensure a constant positive pressure of about 0.05" WG (Water Gauge)—just enough to block out moisture and contaminants.

When a door is opened, the sensor switch immediately activates a high-flow purge of nitrogen into the desiccator's plenum chamber that minimizes the influx of moisture and contaminants.

When the door is closed, the high-level gas flow continues to purge the desiccator for a selectable period of time, ensuring that any moisture that does enter the chamber is quickly forced out of the Automatic RB® (Relief/Bleed) Valve, before it can degrade sensitive materials. This time delay is adjustable, so you can retain the high-flow for a longer time when you suspect moisture contamination may have occurred. Note: The Automatic RB® Valve must be ordered separately.

The dual-purge capabilities of these units ensure that contaminants and moisture stay outside the processing chamber and at the same time guard against dangerous over-pressurization that can lead to warped doors, failed seals—even explosions! And because the Dual Purge System delivers only as much gas as is necessary, it economizes on nitrogen consumption; tests show that in many applications, these units can pay for themselves in a matter of months.

Safety Alarms Ensure Worry-Free Operation

The Dual Purge System incorporates a flowmeter, a line pressure gauge and a variable purge mechanism. A “Low-Pressure” alarm is activated if the incoming line pressure is ever interrupted. This dual audible/visible alarm alerts you to a disconnected supply line, an empty gas storage pod, or other problem that could spell disaster for contents of a desiccator or glove box!

NitroWatch™ Controller Expands Capabilities

The Dual Purge System operates in tandem with Terra's NitroWatch System to fully automate moisture control.

The NitroWatch includes a humidity sensor that continuously monitors the internal RH level and activates the Dual Purge to automatically maintain any sub-ambient humidity threshold you require (down to 0% RH). For more critical requirements, select the NitroPlex™, which combines this automatic humidity control with multiplexed purge capability. In all of these applications, the Automatic RB Valve is required to ensure safe relief of over-pressurization that can build inside a chamber.

The NitroWatch™ is available in two configurations:

  • Smart® NitroWatch™ includes temperature sensing and built-in data logging (downloadable to a USB flash drive).
  • Standard NitroWatch™ does not include temperature sensing or data logging.
  • Dimensions: 12"W x 11.25"D x 7"H (305 mm x 286 mm x 178 mm)
  • Weight: 16 lbs. (7258 g.)
  • Flowmeter: 0-20 SCFH
  • Line Pressure Gauge: 0-60 psi
  • Chamber Sensor: 0 - 0.4" WG (factory set at 0.02" WG)
  • Inlet/Outlet: 0.25" (6 mm) (accepts 0.25" (6 mm) OD polyethylene tubing)
  • Case Material: 304 stainless steel; Chrome plated or stainless steel internal fittings
  • Power Requirement: 110/220VAC, 50/60Hz (requires no manual power setting)
  • Timer Adjustment: 0-8 minutes (factory set at 1 minute)
Dual Purge™ Stand-Alone Operation
The variable Purge Advantage:
Low Flow Conserves N2
when Doors Closed
High Flow Efficiently Purges
Moisture when a Door Opens
Dual Purge™ and NitroWatch™ Working Together
Automated Humidity control
Low Flow Conserves N2
when Doors Closed and %RH Under Set Point
High Flow Efficiently Purges
Moisture when Door Opened or %RH Under Set Point

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.

Dual Purge™ and NitroWatch™ Work Together to Fully Automate RH Control

Terra's Dual Purge™ and NitroWatch™ operate in tandem to precisely and automatically control the flow of nitrogen and maintain a preset humidity level (from ambient to 0% ± 1.5% RH), no matter how operating conditions may change.

Catalog of CE-Marked Products

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

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