Dry-Ice & LN2 Cooled Foreline Traps
F54
Scientific Instrument Services, Inc.
TM
Phone: 908-788-5550
www.sisweb.com/catalog/08/F54
Liquid Nitrogen Cold Trap, Liter
Features:
-
Electropolished 304 Stainless Steel Construction
-
Electropolished cold thimble and trap interior. Provides
resistance to corrosion, and superior vacuum
compatibility. Reduces the effect of radiant heat on the
cold surface.
-
Easily removable cold thimble
Dry-Ice Cooled Foreline Trap
D
ry-ice and alcohol is all that is needed to cool this cold trap to -75°C, thus
trapping most volatile materials. Holds 3 quarts of dry-ice slurry (dry-ice and
alcohol). Holding time is approximately 20 hours depending on vacuum
through-put. The cold well is visible during operation to monitor condensation. Defrost
and clean-up is easily accomplished.
For durability and ease of cleaning, the outer body and cold well are electro-polished
ID/OD 304 stainless steel. Viewing ring and lid are clear acrylic plastic.
S
.I.S.
TM
cold traps are on the "cold thimble" design. The surface of the cold
thimble containing liquid nitrogen at -187°C, being exposed to the vacuum sys-
tem, rapidly condenses molecules in the vapor phase. This action
provides the trapping effect, and cryopumping especially for water vapor the most
common condensable in vacuum systems. Pumping speed for water vapor at the
trapping surface is 95 liters/sec. per sq. inch. The vapor pressure for water vapor at the
cold thimble is reduced to 10
-21
Torr, "theoretical," producing a low base vacuum. Other
gases found in vacuum processes will be sublimated or liquefied at the cold trapping
surface. This effect provides a convenient trapping or collecting mechanism.
Viewing Ring
Part No.
Ports
A
1/2"
10 3/4"
3/4"
10 3/4"
NW 16 x 3/4"
11 1/16"
NW 25 x 3/4"
11 1/16"
NW 40 x 3/4"
11 1/16"
Part No.
Description
4" Diameter Body Inline LN2 ATrap
with NW25 Nipples, 4" Diameter by
11.5" Overall height
4" Diameter Body Inline LN2 ATrap
with NW40 Nipples, 4" Diameter by
11.5" Overall height
tip...
