page 15 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
Electrical connection:
VACUUBRAND diaphragm pumps with ATEX-conformity are equipped with a 230 V / 50 Hz single-
phase motor and are protected by a thermal cutout with manual reset combined with an overcurrent
protection.
See instructions for use concerning notes on electrical connection
Where applicable the motors can be connected directly to an appropriate power supply by suitably
trained and authorised personnel (electrician). It is the responsibility of the user to meet the require-
ments of explosion protection in the power supply and connection area.
Vacuum and outlet connections:
See instructions for use: Make sure that all mechanical connections
are always gas tight and electrically conducting.
The exhaust pipeline must be designed in a way that it cannot become blocked.
If the exhaust pipeline becomes blocked, the overpressure safety device at the pump releases poten-
tially dangerous gases into the environment. Take appropriate safety measures (see instructions for
use).
Evaluate the risk of explosion for the release of pumped gases at the outlet of the pump.
Use and connection of inert gas supply:
For external ATEX equipment category 2G (e.g. for use in Ex-zone 1) the crank case of the pump has to
be flushed with inert gas (e.g. nitrogen). A flow of approx. 1 l/min (at atmospheric pressure) is sufficient.
If necessary the flow should be monitored using a flow meter. Without inert gas purge the pump has
external equipment category 3G. This means the pump has to be used in this case only in a surrounding
with Ex - zone 2 (or no Ex-zone).
It is recommended to install a gas detector (specific to the pumped gas) at the outlet of the inert gas tub
-
ing. The maximum permitted overpressure at the inert gas outlet is 0.1 bar (Check the flow rate through
the gas detector!). A positive signal from the detector indicates a diaphragm failure. In this event switch
off the pump immediately and check the pump.
In the case of pumping condensable vapours, use gas ballast. Connect inert gas with maximum
overpressure of 0.1 bar to the gas ballast inlet (see instructions for use).
Inlet of air into the gas ballast must never lead to formation of an explosive mixture inside the
pump or at the outlet of the pump!
