Stepping motor diaphragm metering pump FEM 1.02 / FEM 1.09
Troubleshooting
KNF Flodos AG BA_FEM1-02_1-09_EN_07_157639.docx
Translation of Original Operating and Installation Instructions
25
Flow rate, suction head or pressure head is too low
The pump does not achieve the performance stated in the Technical Data or on the data sheet.
Cause
Fault remedy
Components in the system
connected to the suction and
pressure sides, such as hoses,
valves or filters, are causing too
much resistance
Modify installation, check cross-sections of components
Hose connections are not leak-
tight
Secure transition joints between hose and hose connectors
with clamps or other clamping elements
Particles in the pump
Clean the pump head, install suction-side filter if required
(see Chapter 8.2)
Viscosity of the transferred
medium is too high
Contact KNF
Incorrect interchange of pres-
sure and suction line connec-
tions
Remove pressure and suction lines and re-connect correctly
The pump parts are not re-
sistant to the medium to be
pumped
Replace the pump head with a compatible version
The generated pressure is
greater than the overflow setting
(.27)
Reduce pressure if possible
Set the overflow higher (maximum specification must not be
exceeded)
Tab. 17
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 first page).
Flush the pump to clear the pump head of any hazardous or aggressive
fluids (see Chapter 8.2.1)
Remove the pump
Clean the pump (see Chapter 8.2.2)
Send the pump, with completed decontamination declaration (see Chapter
11), to KNF stating the nature of the pumped medium
