9
Rotary Vane Vacuum Pumps UNO120 A, DUO 120 A
1
Sight glass
2
Gas ballast valve, complete;
3 Motor,
4
Exhaust flange,
5
Vacuum flange,
15 Casing
28 Support Stand
1 42 44
15
5
4
2
3
43
4.1. Filling Up And Checking The Operating
Fluid
Standard version pumps are tested with opera-
ting fluid P3. Guarantees relating to attainment
of final pressures and trouble free functioning
apply only providing this operating fluid is used.
The delivery consignment contains sufficient operating fluid
for one filling.
Pumps for special applications (e.g. for pumping corrosive
gases) can be operated with special operating fluids such as
F5 and other PFEIFFER operating fluids. The use of such
operating fluids requires prior authorisation from the
manufacturer.
P3 must be disposed of in accordance with local waste dispo-
sal regulations.
➡
Remove operating fluid filler screw 42.
➡
Fill up with operating fluid included in the consignment
(only for P3); refer to rating plate for correct quantity.
➡
Replace operating fluid filler screw 42; be careful with the
O-ring.
➡
Check operating fluid level only when the pump is warm
and running and vacuum connection 5 and gas ballast val-
ve are
closed.
➡
The level of operating fluid must always be between the
top and the middle of the sight glass 1.
CAUTION
➡
Topping up operating fluid is possible when the pump is
running and in final vacuum operations.
➡
In non-stop operations check operating fluid daily,
otherwise whenever the pump is switched on.
4.1.2. Operating Fluid F5
Only the synthetic operating fluid F5 may be used for corrosi-
ve gas model pumps.
The use of other operating fluid must be cleared by the manu-
facturer.
When working with synthetic operating media,
the manufacturer’s directions must be
observed.
If ‘’F5’’ is heated above 300°C, toxis vapours
which can harm the airways are given off.
Do not allow ‘’F5’’ to come into contact with
tobacco products (danger of poisoning when ignited). The
precautions necessary in the handling of chemicals must be
observed.
Please note:
If there is a noticeable loss of operating fluid, the radial shaft
seals should be checked.
If operating fluid is leaking out underneath the casing 15 from
the opening between the support stand 28 and motor 3, the
radial shaft seal must be replaced. Please contact your loca
Pfeiffer-Service (see Section 7.).
4.2. Switching The Pump ON And OFF
When operating the pump gets hot.
The pump can be switched ON and OFF in any pressure
range. On switching off, the built-in high vacuum safety valve
6 to the vacuum plant closes automatically and vents the
pump.
Minimum start-up temperature, in compliance with German
Industrial Standard DIN 28 426: + 12 °C.
On switching OFF (intake pressure < 750 mbar) the built-in
high vacuum safety valve to the vacuum chamber closes
automatically and the pump is vented.
CAUTION
WARNING
4. Operations
42 Operating fluid filler
screw
43 Operating medium drain
screw
28
