Troubleshooting
Type of fault
38
Stepper Motor-driven Diaphragm Dosing Pump
MEMDOS SMART LB
© Lutz-Jesco GmbH 2014
Operating Instructions
BA-10100-02-V02
13.1.7 Diaphragm is torn or tears too often
Possible cause
Remedy
Shut-off valves closed
Open the shut-off valves Inspect
the dosing pump for possible
damage.
Pressure peaks due to accel-
eration with long suction
lines
Install a suction pressure regu-
lator.
The materials are not suitable
for the dosing medium being
used
Check the resistance of the
materials.
Diaphragm not screwed up to
the end stop on the
diaphragm rod
Screw a new diaphragm up to
the end stop.
System back pressure too
high (measured at discharge
connection of dosing pump)
Clean blocked injection nozzle.
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
Check function of safety valves.
Media sediment in dosing
head
Clean the dosing head.
Table 13-7: Type of fault: Diaphragm is torn or tears too often
