Baron manufactures three major types of traps for vacuum drying processes. These systems are specifically designed for vacuum dry-out of electrical apparatus, but can be adapted to a wide variety of drying processes.
Dry Ice Trap
The BA-LN ice trap is a small, portable tank and thimble that utilizes either dry ice and acetone or liquid nitrogen to freeze water and other condensables at the vacuum connection on a transformer during processing. It is compact as well as relatively light and inexpensive. Its disadvantages are the need for using and handling dry ice and acetone or liquid nitrogen.
Volumetric content of internal canister: 20 gallons.
Ice retaining surface: 1200 sq. in., volume of ice at 1/2" thickness = 600 cu. in., total water per cycle approximately 2 gallons
Refrigerated Interstage Oil Condenser
The BA-IOC-11,500 interstage condenser is slightly larger and is typically installed in the piping between the purifier vacuum pump and booster. It uses a single-stage R-22 cooling system to remove transformer oil mist and some of the water from the air stream coming from the transformer to the vacuum system. By intercepting these fluids, vacuum pump oil change frequency is reduced. The trap is quite efficient at reducing transformer oil contamination of the vacuum pump oil but is not as efficient at removing water from the air stream as the dry ice trap or the cascade trap.
Capacity and Performance
Condensate pot: 10 gallons, condensing system capacity: 11,700 BTU/HR
Cascade Cold Trap
The BA-DS-5000 cascade cold trap is the largest and most sophisticated unit. It can be installed in the purifier trailer permanently, or it can be set up as a stand-alone portable system. Using a cascade refrigeration system to supply thermal leverage, the freeze plates are maintained at -65 degrees C. Condensable vapors traveling through the vacuum line freeze to the plates until the end of the vacuum process, at which time the unit is put into defrost mode. Collected liquid can then be measured.
Condensing system capacity: 5000 BTU/HR @ -65oC
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