Diaphragm
–Liquid pump NF 10
Troubleshooting
KNF Flodos AG BA_NF10_EN_05_069219
Operating and Installation Manual
21
Flow rate, suction height or pressure is too low
The pump does not achieve the technical performance data stated on the data sheet
Cause
Fault remedy
Components in the system such
as tubing, valves or filter are
causing too much resistance.
Change installation.
Take larger tubes.
Connections are not tight
Use another connection or use clamps to ensure a tight fit.
Particles in the pump
Use a filter
– clean the pump head. (see section 8.2)
Viscosity of the liquid is too high
Contact your local KNF company.
Inlet and outlet tubing are
connected wrongly.
Check the arrows on the pump head indicating flow
direction.
The head parts are not resistant
against the media.
Replace the head parts with a compatible variation.
Tab. 18
Fault cannot be rectified
If you are unable to identify any of the above causes, please send
the pump to KNF customer services (See address on last page).
Flush the pump to clear the pump head of any hazardous or
aggressive fluids (see section 8.2.1).
Dismantle the pump.
Clean the pump (see section 8.2.2).
Send the pump, with completed decontamination statement
(see Chapter 11), to KNF customer services, stating the nature
of the pumped medium.
