EVASSER

BULLETIN 943 (click here to download)

The Evasser bin aerator from Monitor Technologies is a device used to promote the flow of dry bulk powders from a storage vessel without the noise and damaging vibration caused by pneumatic or electric vibrators. The Evasser aerator is small, compact and capable of aerating many types of bulk powders and granular solids in bins, hoppers and silos. The Evasser can discharge air up to 80 psi (5.5 bar) to move settled materials. Once material is flowing the Evasser can be used to maintain flowability of material with a constant 2 to 5 psi (0.14 to 0.35 bar) supply of air.

Unlike other types of aerators that use cotton or canvas to diffuse the air, the Evasser is less likely to be bound or clogged due to moisture and can be more effective as it directs air flow to 'sweep' the bin wall. In addition, the Evasser is not as prone to back-flow of material as the standard neoprene boot expands to let the pressurized air out and contracts when the air is shut off blocking the air outlets from material backflow.

The Evasser bin aerator is available with a convenient external mounting plate. This means that installation of the device can be done from outside of the bin making it ideal for use in replacing worn and plugged air pads. In addition, with no moving parts or filters to clean or replace the Evasser requires virtually no maintenance.

Principle of Operation

The single Evasser bin aerator operates by continuously introducing air into a mass of stored powder. When first conveyed into a storage vessel, the powder is a highly aerated mixture of air and particulate. In this state, the mixture flows quite easily. As the material settles, the particulate and air separate. The material decreases in volume and increases in density (it packs), and in turn it begins to behave like one solid mass rather than a fluid mixture of particles. The Evasser replaces the naturally lost air and increases and maintains the air-to-particulate mixture ratio, thus allowing the material to flow.

Applications

(click here to download)

The most effective aeration of dry bulk materials is typically achieved by the use of four rows of Evassers, one row located in each quadrant of the slopping bin bottom. With aerating dry powders the Evassers will normally be spaced 18in on centers, with the lowermost units located close to the outlet where most of the bridging starts. On granular materials the location of the Evassers will vary with the material being aerated and the configuration of the bin. In all cases, please consult with the Monitor application engineers that are ready to provide you with the best recommendation for your specific material flow problem.

Features

Accessories

The Evasser bin aerator is available in several configurations. The Evasser itself can be provided in either cast iron or 316 stainless steel construction. The Evasser is normally supplied with a black Neoprene boot. A FDA approved white boot is also available. For high pressure or high temperature applications where the boot is not acceptable, a sintered metal insert can be provided. In addition, each of these configurations can be provided with or without the external mounting plate.

Specifications

Warranty

Monitor Technologies warrants each evasser it manufactures to be free from defects in material and workmanship under normal use and service within two (2) years from the date of purchase. The purchaser must notify Monitor of any defects within the warranty period, return the product intact, and prepay transportation charges. The obligation of Monitor Technologies LLC under this warranty is limited to repair or replacement at its factory. This warranty does not apply to any product which is repaired or altered outside of Monitor Technologies' factory, or which has been subject to misuse, negligence, accident, incorrect wiring by others, or improper installation.

DOC-000-943A Rev.4.07172009

Solids Flow Detection

Microwave solids flow detectors can be used in a variety of applications including feed mills & grain processing, consumer foods (cereal, sugar, cocoa, coffee), chemicals & pesticides and more. For example, one company uses Monitor’s Model SFD-2 solids flow detector to verify the flow of feed pellets through their various transport lines which involves a process where a horizontal screw auger is conveying pellets over to a vertical gravity chute.  The chute then directs the pellets to a process down below. They have carefully placed the SFD-2 so that it detects the pellets as they fall directly across the sensor face. (See Below)

The Model SFI and SFD-2 line of solids flow detectors from Monitor Technologies, LLC provide analog or relay outputs to indicate the flow / no-flow condition of powder and bulk solids materials in chutes and pneumatic conveying lines.  Using microwave Doppler radar technology these units are non-invasive plus extremely reliable and rugged to withstand the rigors of the installation and your process extremes. From automated systems with pneumatic lines to gravity chutes, solids flow monitors can help to improve process performance. They can assist in detecting flow problems, as well as, enhance the level of automation at a facility like turning a conveyor on or off.

For more information on Solids Flow Detectors click here or contact Monitor Technologies LLC at 800-766-6486 in the USA and 630-365-9403 worldwide.

>>Click here for more information about Solids Flow Detectors from Monitor Technologies.
>>Click here for more information on Plug Chute Solutions
>>Download Product Bulletin 813