KNF N838 E Series - Page 50

Troubleshooting
Diaphragm pump N838_E
50
Translation of Original Operating and Installation Instruction, KNF
347394-347605 09/23
Flow rate, pressure or vacuum too low
The pump does not reach the performance stated in the technical data or
data sheet.
Cause Troubleshooting
à
Check the head connection and hose connections
for leaks.
Tab.17:
Pump exhibiting changed running noises and vibrations
Cause Troubleshooting
Pump bearing worn or
defective.
à
Determine the cause.
à
Contact KNF Customer Service.
Tab.18:
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 for a few minutes (if necessary for
safety reasons: with inert gas) at atmospheric pressure to
free the pump head of dangerous or aggressive gases
(see Chapter 8.2.1 Flushing the pump [}33]).
2. Clean the pump (see Chapter 8.2.2 Cleaning the pump
[}33]).
3. Send the pump together with completed Health and
Safety Clearance and Decontamination Form to KNF,
specifying the pumped medium.