11
1. GENERAL INFORMATION
This manual contains information necessary for the proper operation of the pump in
order to prevent unsuitable use and for the safety of the operators. Do not attempt
any other type of operation without having first contacted our
Service Depart-
ment
. The information provided herewith does not intend to replace, integrate or
change any rules, regulations, law by decree, directive or law of specific character in
force in the Country where the installation takes place.
The suggestions given to the staff engaged in the installation and servicing assumes
that the personnel is expert and prepared in facing any problem of servicing, both
mechanical and electrical. For any questions or information not included in this man-
ual, please contact our
Service Department,
always providing: model (type), serial
number, year of manufacture, stated on the pump name plate.
In this manual, the following symbols are used:
ATTENTON
Instructions that, if not followed, could result in serious personal in-
juries.
WARNING
Instructions that, if not followed, could result in pump damages.
2. PRODUCT SPECIFICATIONS
2.1 Pump description
The pump series:
EM4 - EM4/B - EM8 - EM8/B
page 22
EM12 - EM12/B - EM20 - EM20/B - EM28 - EM28/B - EM40 - EM40/B
page 28
are lubricated, with oil recirculation system, rotary vane vacuum pumps.
The pump is splined to the electric motor directly.
The air cooling is ensured by the electric motor fan. At the inlet there is a mesh filter
in order to protect the pump form sold parts having diameter bigger than 1 mm.
Furthermore, an integrated non-return valve prevents the oil from coming back and
the return of air in the chamber to be pumped down during the stop phase (EM4
- EM 4/B excluded). Inside the tank there is a system for separating oil smokes from
discharged air (maximum oil residual 2 PPM/weight corresponding to 2.4 mg/m
3
).
The separated oil is recovered automatically by the pump.
A gas ballast valve, always on, prevents condensation inside the pump when pump-
ing down small quantity of vapour (EM 4 - EM 4/B excluded).
This symbol identifies the inlet threaded port.
This symbol identifies the exhaust threaded port.
2.2 Expected use
These vacuum pumps have been designed to handle air and small quantity of water
vapour only. They are suitable to evacuate closed systems or to operate at a constant
vacuum within the following vacuum range:
EM4
are suitable to evacuate closed systems where the
max. pressure of 2 mbar
(abs.)
is achieved (for ex. vacuum packaging).
EM4/B
are suitable to evacuate closed systems and to operate at a constant vacuum
within 10 and 700 mbar (abs.).
ENG
