Dew Point/Frost Point Static Relative Humidity (Variable & Fixed) Dynamic Relative Humidity (Variable & Fixed) MVTR Leak Rates Loss on Ignition (L0I) Adsorption Rate Determination Thermal Cycling Service Life Pressurized Moisture Generation– Service Simulation % RH/Temp. Data Acquisition.

Vaisala DM500, Precision SAW. Hygrometer. Vaisala DMP501, Remote Dew Point Meter Vaisala HMK15, Humidity Calibration System Star 2000, Vacuum Oven Miller Nelson HCS-401, Moisture Generator TABAI PR-2G, Humidity and Temperature Chamber Peak Scientific NG600A, Nitrogen Generator Tenney Six Temp Shock Chamber Imada DPS110, Digital Force Gauges Thermodyne 1300, High Temp Furnace Ohaus Explorer High Resolution Scale Acculab UI-3 mg, 300 gram Scale Carver Model 3912, Shear Tester MBW – DP3, Chilled Mirror – Dew Point Meter.

Drytech offers a full range of waveguide pressurization components and systems, ranging from the desiccant dehydrator cartridge to a fully integrated waveguide pressurization/purging system.  Drytech exceeds the rigorous challenges of moisture management for mechanical airborne and ground based radars.

The Drytech, Inc. Airborne Waveguide Pressurization System (AWPS) is designed to utilize ambient air in order to provide the radar waveguide with a pressurized, dry, contaminant free and deionized air source to eliminate the possibility of arcing and corrosion within the waveguide. The AWPS can also be utilized to provide an electronics enclosure or sensor pod with the same high quality air source to keep the enclosure free of contaminants and moisture frequently found in desolate operating environments as well as on various flight lines. These systems have been developed to create an initial purge of air at -60°C or better Dew Point, while also supplying a continuous flow of equal quality air in order to compensate for any inevitable system leaks.

The Drytech, Inc. AWPS has a maintainer-friendly replaceable dehydrator cartridge specifically designed to ensure fault-free indication and ease of replacement. Each Series are available with an optional Built-in-Test (BIT) as well as RS422, ARINC-429 and Ethernet connections.

Common Waveguide Problems

1. Balanced Antenna Pressurization (flow vs pressure)
2. Differential pressure control vs. altitude
3. Internal waveguide corrosion
4. Waveguide arcing
5. Breakdown voltage (dielectric strength) of air due to reduced ambient pressure

Challenges

1. Inadequte flow/dead heading
2. Diurnal breathing efficiency
3. Performance balance between pressurized and non pressurized zones (maintaining adequate delta P)
4. Maintaining adequate pressure and flow during mission flight profile
5. Decreased radar performance due to condensed water in waveguide cavities
6. Achieving better than -55°C dew point
7. Providing safety relief to prevent over pressure at antenna array
8. Maintain positive pressure throughout waveguide/antenna system during non-operational/storage scenarios

Solutions

1. Airborne Waveguide Pressurization System (AWPS) - depict image of AWPS
2. Bottled Waveguide Pressurization System (BWPS) - depict image of BWPS

Drytech manufactures a wide range of pipeline dryers (inline dryers) for the protection against moisture and particulate contamination. Our range includes heavy duty robust 316L SS inline filter dryers, to a low cost plastic inline filter dryer for compressed air systems.

Custom solutions are a cornerstone of our business model. If you have any interest in a custom solution, please contact our engineering director, Matt Kinsey, 800-221-0208. Please provide us with as much detailed information as possible, such as envelope of space, affluent air dew point, flight hours, filtration rating, etc.

Many electro-optical applications requiring protection from humidity use desiccant bags or dry gas purging to protect the air space within an enclosure. The downside to these solutions is that applications are becoming smaller each day and these solutions are becoming less feasible.

VMAP is ideal for applications with complex shapes and limited space as it can be molded into any shape or size. VMAP provides a rigid structure which can be readily fixed in place using fasteners, adhesives or other mechanical retention methods. The ability to mold and machine the material allows for low cost prototypes to be quickly produced.

Specifications:

• Polymer: TCP
• Desiccant: Molecular Sieve
• Operating Temp: +90°C to -40°C
• Adosrption Capacity: 9-12% by weight at 50% RH at 22°C

Desiccant breathers are one of the most cost effective methods of protection for contamination control. Breathers are an integral piece to any fluid lubrication, hydraulic system, or storage tank. Breathers provide protection from moisture and particulate contamination in harsh operating environments. The best operations & maintenance practices focus on preventing contaminants from entering their equipment, rather than trying to remove contaminants after damage has already occurred.

As most equipment and machines are designed to "breathe," protecting the inflow of ambient air is vital for protection and reliable operation. Contaminants and moisture will enter equipment as temperature, pressure, and fluid level changes occur. To prevent contaminents from entering your equipment, a desicant breather should be used.

Drytech ZEOZORB desiccant breathers use several layers of high efficiency filters to capture particulates, moisture, and maintain ISO cleanliness codes. Drytech's unique ZEOLITE desiccant blend allows for extremely low relative humidity levels be maintained. Not only do our breathers protect containimants and moisture from entering your equipment, but many test results show that Drytech breathers will actually liberate water from within the fluids or chemicals being stored in the tank simply by having a breather fitted on top of the tank or reservoir.This dynamic is vital to maintain maximum life and performance of the lubricant or chemical being stored.

Recommendations

1. DRYTECH recommends replacing spin on air filter vents, turn down pipes, or vent caps with ZEOZORB disposable desiccant breathers for additional protection against contaminants.
2. DRYTECH recommends inspecting your breather every 6 months.
3. DRYTECH recommends adding breather replacements to plant operations & maintenance schedules

QUICK FACT:
It costs 10x more to remove particulate and water contamination than by preventing it in the first place. Use Drytech Disposable Desiccant Breathers as your first line of defense.

1. ZEOLITE adsorbent

• ZEOLITE adsorbent provides up to 28% by weight adsorption and provides clean dry air less than 100 PPM. ZEOLITE also maintains performance in high temperature environments, unlike Silica Gel.

2. Valved Controlled Airflow

• All tank vent dryers use a series of flapper valves to control the inflow and outflow of air. This maximizes the desiccant performance and prevents desiccant contamination during exhale from tanks or reservoirs.

3. Robust Stainless Steel Construction

• All Tank Vent Dryers are made of 316 stainless steel to withstand the elements and environment for decades. Viton O-Rings are also used for very harsh applications.

4. Color Indication

• When maximum adsorption is reached, the blue indicating ZEOLITE beads will turn from blue to beige, to indicate that a replacement is required.

5. Easy to install & use

• Tank vent dryers are easy to install and can either be wall or floor mounted. Floor mounted models feature a desiccant tray or lever which allows for easy desiccant replacements in the field.

Inhale Cycle

1. Air will enter the base of the breather

2. As the air is drawn into the breather, the moisture is adsorbed

3. This dry air will then flow upward and into the tank or reservoir being protected

4. The very dry air will blanket the free air volume inside the tank and will liberate moisture from within the tank Exhale Cycle

5. Air will be pushed down through the top of the breather

6. The air will flow back down through the desiccant and out of the bottom of the breather