4.2 Operation
The pump should normally be operated continuously. If possible do not
switch the pump off for less than one hour. In the case of process interrup-
tions preferably operate the pump with the inlet shut off, since during opera-
tion at ultimate pressure power consumption will be minimal.
The pump will have attained its operating temperature about 30 minutes after
starting.
Before pumping condensable vapours the pump should have attained its
operating temperature first.
The highest permissible intake pressure is 55 mbar above ambient
pressure.
The permissible pressure at the discharge flange is
p
dis
= p
amb
+ 200 mbar/- 50 mbar. Make sure that the gas flow at the dis-
charge is in no way blocked or restricted and that no pressure can build
up.
After having commissioned the pump and after the pump has been at stand-
still for a longer period of time, the pump may generate more noise than
usual. This noise is caused by the low viscosity of the oil at low oil tempera-
tures. As the oil temperature increases the noise level will drop. The increased
noise level will not adversely affect the operational reliability of the pump.
4.2.1 Operation with SP-Guard
During constant pump operation, the vibration levels will commonly range
between 40...60 digits.
During the switching on process, these values may be exceeded considera-
bly for the few seconds. This has been taken into account by the SP-Guard
and will not cause a shutdown of the pump.
The SP Guard receives a “pump running” signal from the vibration sensor.
With overriding the “limit pump on” threshold the sensor outputs the “pump
running” signal. This is when the hours counter starts.
With a faulty vibration sensor or connection the pump may be running with-
out corresponding feedback signals from the SP Guard. Thus we recom-
mend to synchronize the “pump on” signal of the higher-level control with the
“pump running” signal of the SP Guard and output a corresponding warning
or error message, if necessary.
In the case of ATEX operation an error message must be output, which
results in shutting down the pump.
Resetting the SP-Guard
A reset will only be possible after the fault cause has been remedied.
In order to reset the SP-Guard after a malfunction, operate the pushbutton
located on the right-hand housing side as follows: Press the pushbutton -
long (3 seconds), and then short twice. A confirmation of the resetting pro-
cess will be indicated on the display for approximately 5 seconds.
NOTICE
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