Troubleshooting - ProMinent DULCODOS universal mini Assembly And Operating Instructions Manual

7.2 Troubleshooting

Fault
Suction line contains gas
bubbles
Metering pump is not
pumping or indicates
decreased capacity
The table does not claim to be complete.
Further reasons for failure and detailed information on the causes of faults can be found in the operating
instructions for the individual components.
Possible cause
Priming lift too high, operating condi‐
tions too close to the vapour pressure
of the medium
Suction line leaks and is drawing air
Medium tends to be gaseous
Suction line contains gas bubbles
Suction line is blocked
Suction pressure required is too high
Suction line contains gas bubbles
Flushing or drain open on the suction
side
Shut-off valve on the evacuation tank
not closed
Tank and/or priming lift too high
Empty alert and/or low flow contact trig‐
gered
Ball jammed/stuck in the metering
pump suction or discharge valve
Ball dissolved in the suction or dis‐
charge valve
Diaphragm tear / diaphragm rupture
sensor activated
Opening pressure of the relief valve /
safety valve too low
Open flushing and drainage connection
on the discharge side
Air in the discharge line
Metering line ruptured
Shut-off valve closed (discharge side)
Metering line blocked
Maintenance and Troubleshooting
Remedy
Reduce priming lift, use automatic
gas release, reduce temperature
Check negative pressure tightness
and connections, bleed line
Automatic gas release at the highest
point and in the dosing head, always
lay suction lines at a continuous
incline, avoid higher temperatures
and UV radiation, flush suction con‐
nector
See separate fault indication
Remove blockage / dirt
Modify suction line, use a wider
cross-section and/or use a priming
pulsation damper
Bleed at the highest point, lay suction
line with a continuous incline
Close flushing or drain tap on the
suction side
Close fitting and, if required, re-evac‐
uate the suction line
Use priming aid
Top up chemicals into the storage
tank: make sure that the level sensor
is immersed in the medium
Dismantle, clean and, if required,
replace valve
Replace valve and check resistance
Replace diaphragm and sealing set
Correctly set the opening pressure
Close flushing and drainage connec‐
tion
Bleed metering line at the highest
points
Correctly repair the metering line
Open shut-off valve
Rectify blockage, check opening
pressure of the relief valve and/or
safety valve
31