Diaphragm pump N96 Troubleshooting
Translation of Original Operating and Installation Instruction, English, KNF 316836-316838 01/20
31
Delivery rate, pressure or vacuum too low
The pump is not achieving the delivery rate specified in the technical specifications
or on the data sheet.
Cause Fault remedy
Condensate has collected in the
pump head.
à
Separate the source of the condensate 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
Install the pump at the highest location in the sys-
tem.
There is overpressure on the pres-
sure side and at the same time
vacuum or pressure above atmo-
spheric pressure on the suction
side.
à
Change the pneumatic conditions.
Pneumatic lines or connection
parts have insufficient cross-sec-
tions or are throttled.
à
Disconnect the pump from the system to deter-
mine the output values.
à
Eliminate throttling (e.g. valve) if necessary.
à
Use lines or connection parts with a larger cross-
section, if necessary.
Leaks occur at connections, lines
or pump head.
à
Eliminate the leaks.
Connections or lines are com-
pletely or partially clogged.
à
Check the connections and lines.
à
Remove any parts and particles that are causing
clogging.
Head parts are soiled.
à
Clean the head components.
Operating diaphragm broken
à
Shut down the pump immediately.
Diaphragm and valves are worn or
defective.
à
Replace diaphragm and valves (see Chapter 9.3
Replacing diaphragm and valve plates).
Tab.31
Pump exhibiting changed running noises and vibrations.
Cause Fault remedy
Pump bearing worn or defective.
à
Determine the cause.
à
Contact KNF Customer Service.
Motor worn or defective.
à
See operating instructions for the motor.
Tab.33
Fault cannot be rectified
If you are unable to identify any of the specified causes, send the pump to
KNF Customer Service (contact data: see www.knf.com).
1. Flush the pump with air at atmospheric pressure for a few minutes (if
necessary for safety reasons: with inert gas) to free the pump head of
dangerous or aggressive gases (see Chapter 9.2.1 Flushing the pump).
2. Clean the pump (see Chapter 9.2.2 Cleaning the pump).
3. Send the pump together with completed Health and Safety Clearance
and Decontamination Form to KNF, specifying the pumped medium.
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