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To protect and enhance your valuable mechanical vacuum pump and product.

Vacuum pumps perform better and last longer when used with the appropriate inlet trap or filter. In addition the selection of an exhaust filter will eliminate oil mist and possible pollutants from the work area.

DIT - Series

A convenient, low cost way to trap excess condensable vapors that can enter the mechanical vacuum pump. This table top trap can also be used as a chamber for sample freeze-drying. Dry ice and isopropyl alcohol is combined in a 50/50 mix to produce a super cooled slurry in the 3-quart trap well. ** Use of Acetone in place of Isopropyl Alcohol will damage the plastic cover and viewing ring. The metal surface of the inner trap well can reach -75 degree C and at that temperature will condense most volatile materials. 

The trapping surface of the center well is visible during operation through the top view ring. Defrost and clean up of the trap is made easy by lifting out the trapping well after venting the system to atmospheric pressure.

Generally, a single charge of the dry ice and alcohol mix is enough to last most of the day. Functionally, the IPA/Dry Ice charge is installed inside the inner well (sump) so that the air stream will pass around the wells' circumference. Air flow is from the inlet port to the exhaust port moving around the intervening well. As the contaminant laden air flow passes around the traps metal well surface, condensable vapors such as water or solvents will crystallize out of the air stream.

Construction of the DIT is of 304 stainless steel that has been electro-polished to minimize surface roughness. The outer body wall is .065 inch thick and is stainless steel with welded-in inlet ports of varying configurations. Vacuum rated silicone grease is sometimes employed on the rubber gasket used with the well. A thin coating would be all that is required if determined that the trap is leaking pressure.

Depending on how the trap is ordered it can come configured with hose nipples or standard ISO flange fittings. In order to hook the trap up on the inlet side of the pump you need to connect a section of high vacuum hose or tubing between trap and pump. It is advantageous to determine the sizes desired prior to purchase but these can be easily adapted after the fact.

The user then connects the trap inlet to the system being evacuated. Pretty simple and straight forward, but there are obvious benefits to having the port sizes of the pump, the system being evacuated and the trap all match in (Outside Diameter) size. The cold well (sump) has a acrylic plastic cover and a rubber gasket which should maintain vacuum integrity. With long term use, you may find a need to replace the rubber gasket found between lid and trap top in order to minimize potential leaks. Also be careful as not to scratch the lids surface where it seals to the rubber gasket and the top of the trap.

Dry Ice Inlet Trap
Ordering Information





3/4" Hose Ports both ends

10 3/4"


NW16 Flanges both ends

11 1/16"


NW25 Flanges both ends

11 1/16"


Tube fittings both ends

11 1/16"

Replacement Parts and Options


Not Web Established Yet
Body Gasket
Well O-ring Gasket
Dry Ice Well
Viewing Ring
Well Lid
Solid view cover to convert DIT into vacuum chamber
Vent valve and 0-30" vacuum gauge on NW Flange

Cleaning Dry Ice Traps

11/26/2005 ęCopyright HyVac Products, Inc. All Rights Reserved
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