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3.3.3 Oxygen pumping
For certain appUcations, mixtures containing a certa i n concentration
of oxygen or even pure oxygen are used.
Mineral oils are flammable ; In addition they oxidize duri n g pumping
and rapidly lose their lubricating properties. When the pumped
gases contain more than 30 % oxygen, mineral oils should not be
used. The following s y nthetic oils or oils classed In the same cate
gory, should be used
:
- ALCATEL 1 1 3 - FOMBUN YL VAC 25.6" - KRYTOX 1 5 -25** -
DEM N U M S* 65
*'"
• - AFLUNOX 1 5.25 .. **
Olis such es trlaryl phosphate ester have already
caused accidents ; they should not be used.
Where use Is lntermfttent,ln case of Intermittent pumping, we can
use mineral based olls as ALCATEL 200 and ALCATEL
To prevent oxygen from accumulati ng In the e q ui p ment. the oil
casing must be fitted with a neutral g as (d ry nitrogen) purge to dil ute
the oxygen. The neutral gas flowrate must be about five times the
oxygen flowrate.
3.4 SETUP
3.4.1 FIiiing pump with 011
Remove fill plug (1
6).
Flll with oil to middle of sight glass ( 1
This operation must be performed with pump stopped. Do not over
tight the fill p l
ug.
3.4 . 2 Mechanical Connections
a) Mounting on a Frame
The pump can be mounted on a: frame by using the
holes in base (3) and 4 special shock mounts (see §
NOTES
:
These mounts reduce the
hold the pump securely when the pumping assemb l y is moved.
Clamp pump to frame before moving.
b)
Ventllatlon
T he pump and motor are equipped with a v.entllation
When 1he pump Is Installed, the pump should be placed In a venti
lated
location.
Check ventilation holes on the pump and motor periodically for
obstructions.
Alcatel pllmps are designed to operate at a n ambient tempera
ture of 10 to 40
C. If the temperature is likely to rise above
°
40
C, an auxiliary cooling device can be used (see § 3.4.3).
9
c) Inlet and Exhaust Ports
The pump In l et and extiaust ports are equipped with ISO NW 40
nipples for Pneurop quick connectors to accept various stainless
steel, plastic, etc. tubing accessories (see diagram 7).
• Registered trademark of MONTEDISON
.. Registered trademark of DU PONT DE NEMOURS
..... Registered trademark DAI KI N
... . . Registered trademark S C M
300.
8).
4.
mounting
3.4.3).
pum
p vibrations but will not
system
.
3.4.3 Accessory Table
Part
Description
Location
Number
exhaust
Oil mist
06831 6
eliminator
Dust filter
068440
inlet
786538
in l et
Liquid
nitrogen
tra p
Inlet
Molecular
053379
sieve
filter
Remote
068395
on frame
controlled
gas ballast
Oil filter
068990
external
(220 V)
device
(D E)
068991
( 1 1 5V)
Auxiliary
054257
between
cooling
frame and
device
motor
Shock
082691
between
mount
(APEX
base and
LXA 88
machine
Mod. D)
frame
Shock
052996
between
mount
pump
(special)
frame
and
machine
frame
In general, use accessories whose tightness and materials are
compatible wHh the pumped gasea at both the Inlet and exhaust.
At the pump exhaust, the discharge circuit must be such that the
resultlng overpress u re In the oll case Is less than or equal to 0.5 bar
relative pressure.
See table "Se l ectlng pumps and Accessories for Specific Applfca
tions" at the back of this manual (diagram 6).
3.4.4 Electrlcal connection
Generally speaking, the motor should be fused for 1200/oof Its rated
current
For series motors, see table "Protection of Electric Motors (see dia
gram 5).
a} Three-Phase Version
Hook up motor according to line volti3ge. The connections are
shown on the schematic l ocated Inside the terminal box or on the
lid.
The pumps are delivered with their motora connected to maxi•
mum voltage. Switch on current brlefly to check motor rotation
direct i on. The end of the shaft must rotate In the direction of the
arrow on the motor mount i ng plate.
b) Single-Phase Version
The motors are wired for the voltages shown In diagram 5. They
are supp li ed w i th a 6 - foot power cord. The plug Is equipped with a
ground pin which must be connected. The motor rotation direc
tion Is set at the factory.
Function
• separates oil droplets f! nd conta-
mlnant
particles
In exha!lsted
gases from the machanlcal va-
cuum pumps.
• prevents dust particles larger than
6 microns from accumulating In
the pump and oil.
• protects pump against conden-
sable vapors.
• lr revents oil from backstreamlng
nto pumped
chamber.
• prevents oil backstreaming (when
used to back a diffusion pump
or TMP).
• facilitates pumping condensable
vapors, regenerates pump oil, by
remote control.
• fi l ters ol l when pumping gases
containing dangerous dusts which
could rapidly degrade oll quality.
• when operating at ambient tern-
pe ratures above 40
°
C, a water
cooling ring can be fitted.
• allows pump to be mou nted
a frame.
• to be used when even the sligh-
test vibrations must be eliminated
(with
TMP)
(hlgh-pertormanc e
shook mount) .
on
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