Koby Vacuum Pump Exhaust Filters

Removes Contaminants From Vacuum Pump Exhausts

Features

Purifies Exhaust Gases from Vacuum Pumps
Adsorbs Organic Vapors and Small Particles
50 Grams of Activated Charcoal in Each Trap
High Efficiency Filtration
Minimal Pressure Drop
Low Operating Cost
Maintenance Free
Completely Disposable
Pressure Safe to 90 PSI
Easily Installed and Replaced
Equalizes Air Flow
Helps Maintain Safe Working Environment
¼" NPT Brass Male Fittings

Function

Koby Air Purifiers are installed on exhaust ports of roughing pumps to adsorb remaining compressed air contaminants such as oil aerosols, oil vapors, certain other hydrocarbon vapors, and trace moisture. They also trap all foreign solid particles such as dirt, dust, rust, and pipe scale down to 0.5 microns in size. In addition, Koby Air Purifiers can be used for efficient adsorption and removal of organic vapors and aerosols, noxious odors, certain foreign gases and bacteria, and are effective in removing certain inorganic vapors and aerosols from compressed air and vacuum air.

The Koby Charcoal Filters are highly recommended to be placed on the exhaust of vacuum pumps that are normally vented directly into the laboratory. SIS has undertaken extensive studies on the application and efficiency of the Koby filters when used on vacuum pump exhausts. Vacuum exhaust air which is exhausted through the Koby filter, has been shown to be cleaner than normal room air.

Figure #1 - Effect of Vacuum Pump Exhaust Filtering

The chart above shows the steps in filtering air from a vacuum pump after 1.0 ml of gasoline was injected into the pump. The top chromatograph shows the low boiling organics as well as high boiling hydrocarbons that are exhausted out of the vacuum pump before any filtering. The second chromatogram shows the exhaust air after the oil mist eliminator - the oil mist eliminator traps the heavy hydrocarbons from the pump oil and returns them to the pump. The bottom chromatogram shows the exhaust air after it is filtered through the Koby trap - the exhaust air is cleaner than the normal room air.

For additional information and the results of our studies visit the SIS Application Notes on Vacuum Pump Exhaust Filters:

It is normally recommended that the Koby carbon filters be used in conjunction with an oil mist eliminator. The oil mist eliminator traps and returns the oil to the vacuum pump, preventing this oil from saturating the charcoal filter which will reduce its life. The Koby Air Purifier removes any remaining contamination which might otherwise be emitted into the laboratory air. However in applications where the gas ballast valve is not used and large volumes of air are not purged through the vacuum pump, the Koby trap can be attached directly to the vacuum pump.

Figure #2 - Koby Charcoal Filter Mounted on a Vacuum Pump Exhaust

Adsorption Capacity

The carbon used in the manufacture of Koby Air Purifiers has a huge internal and external surface area with an affinity for adsorbing organic contaminants. Each gram of carbon has a surface area of approximately 1500 sq. meters, making Koby Air Purifiers particularly efficient for most air purification and gas phase applications.

Actual Adsorption capacity can be as high as 80% of carbon weight depending on the specific compound being removed. Generally (but not always), adsorption capacity of activated carbon increases with molecular weight, boiling point, and concentration of contaminants. Compounds with low molecular weights, and or highly polar compounds will not be sufficiently adsorbed at low concentrations.

Range of Possible Adsorption Capacities

Contaminant	Initial Removal Efficiency	% of Carbon Weight Adsorbed for Individual Contaminants
Oil Vapor	99.9%	50-60%
Organic Solvents	99.9%	15-45%
Oil Aerosols	99.9%	50-60%
Moisture	99.9%	30-50%
Hydrocarbon Vapors	99.9%	50-60%
Oil Mist	99.9%	50-60%
Dirt	to 0.5 microns	N/A
Bacteria	to 0.5 microns	N/A

Vacuum Pump Exhaust Filters

The Koby air purifiers can be mounted in various configurations depending on your vacuum system requirements. The air purifier can be fitted with a QF25100SP25 fitting to enable it to mount directly on top of the exhaust port on the Alcatel vacuum pump. The rubber flap should be removed from the vacuum pump exhaust port.

The Koby air purifier does not need to be placed directly on top of the vacuum pump. In many systems where space is limited, it is more convenient to attach a hose to the pump exhaust port and then using a KF-1, KF-2, or KF-3 fitting, adapt the Koby air purifier to fit the hose. It is also practical, using these same fittings, to run a hose or vacuum line from the top or exit nipple of the air purifier to exhaust any remaining contaminants to a hood or building exhaust system.

Purifier Life

Koby Air Purifiers do not have a visual change element and must be replaced periodically to insure efficient adsorption and filtration of compressed air impurities. For best performance, filters should be replaced after 30 days of use or sooner, when air sampling indicates outward air quality has reached an unacceptable level. Actual purifier life can vary depending on flow rate, concentration of contaminants, and operation temperature. Purifiers will not deteriorate when not in use.

Fittings - Standard fillings on filters are 1/4" NPT. Optional fittings shown below are available to adapt filters to pumps to various hoses and flanges.

Fittings to Adapt Koby Air Purifier to various connectors

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