KNF LABOPORT N820.18 Originalbetriebsanleitung Seite 119

Chemically-resistant Laboratory pump N820.18 / N840.18
Flow rate, pressure or vacuum too low
The pump does not reach the performance stated in the technical data or
data sheet.
Cause
Condensation has col-
lected in the pump
head.
There is overpressure
on the pressure side
and at the same time
vacuum or pressure
above atmospheric
pressure on the suction
side.
Pneumatic lines or con-
nection parts have in-
sufficient cross-sec-
tions or are constricted.
Leaks occur at connec-
tions, lines or pump
head.
Connections or lines
are completely or par-
tially clogged.
Head parts are soiled.
Diaphragm or valves
are worn.
Translation of Original Operating Instruction, KNF 317428-317425 02/23
Troubleshooting
à
Separate the source of the condensation from the
pump.
à
Flush the pump with air at atmospheric pressure for
a few minutes (if necessary for safety reasons: with
an inert gas).
à
If present, open the gas ballast and flush the pump
head.
à
Change the pneumatic conditions.
à
Disconnect the pump from the system to determine
the output values.
à
Eliminate any constriction (e.g. valve).
à
Use lines or connection parts with a larger cross-
section if necessary.
à
Ensure the correct seating of the hoses on the hose
connectors.
à
Ensure that the connections are correctly mounted.
à
Replace the leaky hoses.
à
Eliminate the leaks.
à
Check the connections and lines.
à
Remove any parts or particles that are causing
blockages.
à
Clean the head components.
à
Replace the diaphragms and the valve plates/seals
(see Chapter 10 Servicing [} 42]).
Troubleshooting
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