Welch Vacuum 1376N Chemstar - Manual (Page 25)

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Welch offers two types of cold traps - dry ice slurry or liquid nitrogen traps. For CHEMSTAR pump models 1402N-01
or 1376N-01, the dry ice slurry trap cat. No. is 545002 and for the liquid nitrogen trap the cat. No. is 546002. For model
1400N-01, the dry ice slurry trap cat. No. is 545001 and for the liquid nitrogen trap the cat. No. is 546001. For model
1374N-01, the dry ice slurry trap cat. No. 545003 and for the liquid nitrogen trap the cat. No. is 546003. Call Welch
Technical Service at 847-676-8800 extension 1 for recommendations on the piping connections need to connect the traps
to your vacuum chamber.
CAUTION
Welch recommends isopropyl alcohol, NOT acetone, be used to make the
dry ice slurry.Acetone will discolor and eventually weaken the Plexiglas
cover on the dry ice slurry trap.
Cat. No. 1420E-02 is the replacement element for acid neutralization trap, Cat. No. 1420H-21, with the 4.5 inch sump.
Cat No. 1420E-01 is the replacement element for acid neutralization trap, Cat. No. 1420H-20, with the 9.5 inch sump.
The acid neutralization trap may be installed vertically or horizontally.
C 2. Hermetically Sealed Oil Mist Eliminator
When pumping corrosive gases, you are striving to have them pass with a short residence time through the pump and
out the exhaust port. An oil mist eliminator will coalesce the oil mist evolving from the CHEMSTAR pump and have the oil
drain back into the pump. The use of an oil mist eliminator is particularly important when expensive perfl uoropolyethers,
such as Fomblin Y06/06, are used. The corrosive gases continue to pass through the mist eliminator and out to your
exhaust system (for example, hose running to a fume hood).
A hermetically sealed mist eliminator is recommended rather than a standard exhaust fi lter for corrosive gas applications.
Hermetically sealed mist eliminators are designed to coalesce the oil mist but not leak corrosive gases. Standard exhaust
fi lters are not designed to contain the corrosive gases before passing into your exhaust system.
WARNING
Failing to use a hermetically sealed mist eliminator tied to an exhaust system
can lead to the leaking of corrosive gases into the work area. The leakage can
be harmful to personnel in and around the work area.
Welch offers a compact, hermetically sealed in-line oil mist eliminator - cat no. 1416D for Models 1400N-01, 1402N-
01 and 1376N-01. For Model 1374N-01, the cat no. of the mist eliminator is Model 1416F. The oil mist eliminator
automatically drains coalesced pump oil back into the CHEMSTAR pump. The replacement element for Model 1416D is
cat. No. 1417Y-05. For Model 1416F the replacement element is cat. No. 1417V-05.
The element comes with both catalog numbers 1416D and 1416F. the element is easily inspected or replaced by
snapping open the quick toggle body clamp.
The oil mist eliminator is constructed of stainless steel with a Fluoroelastomer gasket and oil return valve-Fluoroelastomer
is a registered trademark of E.I. DuPont. The element material is borosilicate micro fi bre. All three materials are highly
resistant to corrosive gases.
Connection of the oil mist eliminator to the pump is via a ISO NW25 fl ange. Connection of the oil mist eliminator to the
exhaust system is via a 13/16” ID vacuum hose.
Welch offers a mist eliminator to pump connection kit to clamp the oil mist eliminator to the pump. The CHEMSTAR pump
models 1402N-01 and 1376N-01, the kit-cat. No. 1416E-02 - consists of a NW25 hinge clamp and NW25 centering ring.
For 1374N-01, the kit-cat. No. 1416E-03 - consists of a NW40 hinge clamp and NW40 centering ring.
For model 1400N-01, the kit-cat. No. 1416E-01- consists of an adapter that convert the ¾” thread with o-ring seal to ISO
nw25, NW25 hinge clamp and NW25 centering ring. For 1374N-01, the kit - can. No. 1416E-03 - consists of a NW40
hinge clamp and NW40 centering ring.
For model 1400N-01, the kit-cat no. 1416E-01 - consists of an adapter that convert the ¾” thread with o-ring seal to ISO
NW25, NW25 hinge clamp and NW25 centering ring. You will need to remove the ISO NW16 adapter with o-ring seal on
the pump when it arrives with the ISO NW25 adapter.