TDI International, Inc. - The Technical Source!

Standard Features/Information:

• Solid state sensor system for controlling relative humidity.
• Reduces nitrogen consumption up to 90% (20%RH)
• Sensor system activates solenoid as N₂ flow required
• Capable of measuring and displaying 0 - 100% RH
• Automatic alarm system alerts when pre-set humidity control setting
  not achieved maximum 2 hour cycle.
• Designed for use at pressures up to 100 PSI
• Nitro-Save® Operating Instructions

Electrical Requirements:

• Input:  120V A.C. / 60Hz / 10W
• Output:  9V D.C. / 500wA
• Foreign plugs available upon request.

Request a Quote for Desiccator with Nitro-Save®

The primary purpose of desiccators is to establish precise relative humidity levels to protect moisture sensitive materials in a clean environment.   TDI has developed an economic, solid state system that accurately controls humidity and significantly reduces nitrogen consumption.  

The Nitro-Save® includes a solenoid control valve and internal sensor system to regulate the nitrogen flow in response to the high humidity set point.  Whenever the humidity rises 2% above the set point the control valve will turn on.  Once the humidity decreases 2% below the set point, the control valve will turn off.  Each time the control valve turns on, the monitor will begin a 2 hour timer.  If at the end of 2 hours the humidity has not reached 2% below the set point, the High Humidity Alarm will sound.  Under normal operating conditions the alarm at the end of the 2 hour cycle will indicate a problem such as a lack of nitrogen flowrate or the cabinet door remained open.

The High Humidity Set Point has been pre-programmed to 20% RH, which represents general electronics requirements.  The RH % settings can be increased for less critical humidity control or decreased for more critical humidity control.

To maintain low moisture conditions in TDI Desiccator Cabinets, a constant dry nitrogen gas supply is required, connected to the nitrogen flowmeter on the desiccator cabinet.  The flowmeter regulates the nitrogen gas flow (cu/ft/hr) to the plenum chamber of the desiccator with the nitrogen gas distributed uniformly through the perforated inside wall of the plenum chamber into each compartment.

TDI Desiccator Ultra Nitro-Flow System

All TDI Acrylic Desiccators are constructed with Ultra Nitro-Flow compartment flow-throughs, which achieve a single pressure and atmosphere condition throughout the desiccator.  This unique design allows maximum gas flow in both the vertical and horizontal directions and reduces higher moisture humidity conditions between compartments.

This flow design allows for a single automatic bleeder valve per multiple compartment cabinet and eliminates the need for expensive outlet valves for each compartment, required in typical competitor cabinets.  The bleeder valve is located in the bottom of the lowest compartment and serves as an efficient outlet drain for the heavier high moisture atmosphere within the cabinet.  This design also allows for a single #HM40 Nitro-Save® Humidity Control Monitor sensor system for multiple compartment desiccators.

Nitrogen Gas Distribution Diagram

The Ultra Nitro-Flow System offers a highly efficient/economical design to provide rapid recovery to pre-set RH% levels when doors are opened in normal usage functions.

In cases where the Nitro-Save® is running when the doors are opened, a positive pressure of Nitrogen flow extends throughout the cabinet plenum wall to all compartments and exits through the open compartment.  This precludes any higher humidity room air back fill into the cabinet.

The desiccator cabinet and room atmospheric pressures are similar when the Nitro-Save® has achieved pre-set RH% settings and is in the off position.  When the doors are opened, air movement between the compartment and the room is slight during the brief time frame of exposure with minimal RH% level increase in the desiccator.

Cleanrooms generally operate in a 45/55% RH range and this would represent the highest increase condition possible inside an open cabinet compartment.