Types of Desiccant Devices

Desiccant Breather

Desiccant breathers are designed to protect electronics, optics, and free air volumes in hydraulic tanks, reservoirs, and gearboxes against moisture ingress during diurnal exchanges of air. These exchanges occur as pressure, temperature, altitude or fluid levels change. Desiccant breathers use a desiccant medium such as, ZEOLITES, activated alumina, silica gel or others to draw out moisture vapor from the air. Most units are designed to force air through a bed of desiccant thus expelling dry air out the other end. Desiccant breathers are also commonly referred as a desiccant canister, desiccators, dehydrator cartridge, and dehydrating breather.

Breather Desiccator

Breather desiccators are a common term used in the aerospace and defense industries to describe a desiccant breather which protects sensitive electronics, optics, radar waveguide systems and more from moisture and particulate contamination. Breather desiccators are used in dynamic environments where the units are exposed to ambient air.

Static Desiccator

Static Desiccator is a device that is designed to provide protection against moisture in electronics, optics, packaging and much more. Desiccators are sealable enclosures containing desiccants used for preserving moisture-sensitive items. They provide protection against moisture loading, hygroscopic loading, within the equipment such as circuit boards, capacitors, and other components. The contents of desiccators are exposed to atmospheric moisture whenever the desiccators are opened. Hence, they are not appropriate for storing chemicals which react quickly or violently with atmospheric moisture such as the alkali metals, a tank vent dryer or desiccant breather may be more suitable for these purposes.

Vent Dryers

Vent Dryers work on the principal of a desiccant breather for protection of bulk storage, ranging from corrosive chemicals, powders, and liquids. The vent dryers serve as the breathing point during diurnal air exchanges where the air must then pass through a bed of desiccant, protecting against moisture and providing a dry air blanket to protect what is being stored. Vent dryers are also known as Tank Vent Dryers, Reservoir Dryers, and/or Tank Vent Breathers.

Humidity Indicator

A device which monitors the humidity conditions within an enclosure or equipment. Humidity levels range between 10%-70% RH (relative humidity) at 25°C

Pipeline Dryers

A device designed to take unconditioned pressurized air or gas and remove moisture and contaminants so that the effluent air is dry for use in equipment, radars, and air compressor systems. Pure dry air can be generated using this method.

Membrane Dryer

A device which uses a continuous flow of compressed air through a dehumidification membrane to remove water vapor from the air. The compressed air is filtered by a coalescing filter which is designed to remove water, oil, and particulate from the air. This air then passes through the center of the membrane and water vapor laden air permeates through the fibers in the membrane, thus providing dry air. Any remaining water vapor laden air is exhausted from the system. The devices are controlled via the compressed air flow and pressure. Maintenance is required every few years and requires filter replacement.

Regenerative Breather

Much like a desiccant breather, a regenerative breather uses a desiccant medium to draw out moisture vapor from the air. Most units are designed to force air through a bed of desiccant, thus expelling dry air out the other end. The benefit to a regenerative breather is that the desiccant medium is regenerated instead of being disposed of. Most units are designed with two separate cylinders, each with their own purpose, one to dry the air, the other to regenerate the desiccant. As one bed becomes saturated and less efficient a solenoid controlled valve will switch cylinders so the saturated desiccant will begin to be regenerated as the other cylinder becomes active and dries incoming air.