Version without filter pressure gauge:
◆
Make sure that the vacuum pump is running
◆
Check that the drive motor current drawn is in the usual range
Version with oil return valve (RA ... C, 0.5 mbar):
Note
: The discharged gas will also contain oil if the vacuum pump is
operated without interruption for too long a period (
Ú
page 8: Opera-
tion Notes).
●
Check that the discharged gas is free from oil
Assessment
If
the reading on the filter pressure gauge is in the red field,
or
the drive motor draws too much current and/or the pump flow rate
has dropped,
then the exhaust filter is clogged and must be replaced.
Note
: Exhaust filters cannot be cleaned successfully. Clogged exhaust
filters must be replaced with new ones.
If
the filter pressure gauge indicates a lower pressure than usual,
or
the drive motor draws less current than usual,
then the exhaust filter is broken through and must be replaced.
If the discharged gas contains oil,
the exhaust filter can either be clogged or broken through and, if appli-
cable, must be replaced.
Change of the Exhaust Filter
DANGER
_age32
In case the vacuum pump conveyed gas that was contaminated
with harmful foreign material the exhaust filter will be contami-
nated with harmful material.
Danger to health during the changing of the contaminated exhaust
filter.
Danger to the environment.
Wear personal protective equipment during the changing of the
contaminated exhaust filter.
Used exhaust filters are special waste and must be disposed of
separately in compliance with applicable regulations.
CAUTION
_a1
The filte
r spring can fly out of the exhaust port during re-
moval or insertion.
Risk of eye injury.
Eye protection goggles must be worn while handling filter springs
Removing the Exhaust Filter
●
Make sure that the vacuum pump is shut down and locked against
inadvertent start up
●
Prior to disconnecting pipes/lines make sure that the connected
pipes/lines are vented to atmospheric pressure
●
Remove the discharge line, if necessary
●
Remove the exhaust cover (g) from the oil separator (e)
●
Loosen the screw in the centre of the exhaust filter retaining spring
, but do not remove it at this time
●
Press the exhaust filter retaining spring out of the indent and
rotate it
●
Remove the exhaust filter retaining spring from the oil sepa-
rator (e)
●
Pull the exhaust filter out of the oil separator (e)
Inserting the Exhaust Filter
CAUTION
_a
The non-OEM spares market offers exhaust filters that are geomet-
rically compatible with Busch-vacuum pumps, but do not feature
the high retention capacity of genuine Busch-exhaust filters and de-
teriorate the service life and the efficiency of the vacuum pump due
to their increased back pressure.
Increased risk of damage to health.
Adverse effect on efficiency and service life.
In order to keep the emission on the lowest possible level and to
preserve efficiency and service life only genuine Busch-exhaust fil-
ters shall be used.
●
Make sure that the new exhaust filter is equipped with a new
o-ring
●
Insert the exhaust filter such that its port is properly seated in its
receptacle in the oil separator (e)
●
Make sure that the tip of the screw in the centre of the exhaust fil-
ter retaining spring protrudes the retaining spring by about
2 - 5 revolutions
●
Insert the exhaust filter retaining spring such that its ends are
secured in their receptacles in the oil separator (e) by the protru-
sions and that the tip of the screw snaps into the indent of the ex-
haust filter
●
Ti
ghten the screw in the exhaust filter retaining spring such that
the screw head touches the spring steel sheet
●
Make sure that the seal under the exhaust cover (g) is clean and
undamaged, if necessary replace with a new seal
●
Mount the exhaust cover (g) together with the seal and hex head
screws on the oil separator (e)
●
If necessary connect the discharge line
Note
: During operation the exhaust filter gets saturated with oil. It is
therefore normal that the oil level will drop slightly after replacement
of the exhaust filter.
Overhaul
CAUTION
_a
In order to achieve best efficiency and a long life the vacuum pump
was assembled and adjusted with precisely defined tolerances.
This adjustment will be lost during dismantling of the vacuum
pump.
It is therefore strictly recommended that any dismantling of the
vacuum pump that is beyond of what is described in this manual
shall be done by Busch service.
11
