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Page 29
Pr
o
Minent
®
4
Start-up/Maintenance
NOTICE
Observe the safety notes provided in Section 1.
4.1
Start-up
All general guidelines in the accompanying ”General operating instructions ProMinent
®
motordriven metering pumps and hydraulic accessories” apply.
4.2
Maintenance
NOTICE
After loosening the liquid end screws (e.g. to change the valves or diaphragm),
the screws must be retightend corsswise to the specified tightening torque.
What requires maintenance?
• Secure fit of liquid end screws.
• Secure fit of metering lines (intake and delivery sides).
• Secure fit of head valve and intake valve.
• Leakage hole at end disc for moisture (indicates possible diaphragm failure).
• Operate pump continuously for a short period of time in order to check whether
it delivers correctly.
Maintenance intervals
General recommendation for maintenance intervals - every 3 months.
Shorter intervals are recommended if operated under load conditions (e.g. continuous operation).
The metering diaphragm is a wearing part whose service life is dependent on following
parameters:
• System backpressure.
• Operating temperature.
• Properties of medium to be metered.
The service life of the diaphragm is restricted in the case of abrasive media. In such cases, it is
recommended to check the diaphragm more frequently and to install a diaphragm failure monitor.
4.3
Replacement of wearing parts
Replacing diaphragm (see exploded diagrams in appendix!)
NOTICE
Flush liquid end first in the case of hazardous media. For this purpose, force
water or a suitable flushing agent through the intake connection of the liquid end
with a wash bottle.
왘
Set stroke length to zero with the pump running. Switch off pump.
왘
Release the six screws holding the liquid end, detach liquid end together with
screws.
왘
Release diaphragm from the push rod by jolting in counterclockwise direction and
unscrew.
왘
Screw on new diaphragm until it is firmly seated on the push rod. Mount the dosing
head with screws such that the suction connection lies at the bottom (observe the
flow through direction / arrow marks on the valves). Switch on pump. Set stroke
length to 100% and turn in screws then tighten crosswise to 4.5
±
0.5 Nm. Check
pump for leaks at max. pressure.
Start-up/Maintenance