Maintenance; Troubleshooting - ProMinent alpha Series General Operating Instructions

Maintenance/Troubleshooting
Page 18
7

Maintenance

WARNING
• Explosion-proof pump only: it is essential that you observe the contents of section 9!
IMPORTANT
• Refer to notes in product-specific operating instructions!
• If metering pumps are sent for repair to the manufacturer or a ProMinent dealer,
clean all parts which come into contact with the medium before shipping.
Essentially, maintenance is restricted to checking the metering capacity and for leaks.
Diaphragm failure:
Change diaphragm as described in Section "Diaphragm-type metering unit" in the
product-specific operating instructions.
Impermissibly high leakage from piston-type liquid ends:
Replace packing as described in Section "Piston-type metering unit" and "Notes on packing
seal" in the product-specific operating instructions.
Replace packing as described in Section "Piston-type metering unit" and "Notes on packing
seal" in the product-specific operating instructions. In order to maintain the delivery unit, we
recommend to keep a spare parts kit in stock, consisting of the wearing parts such as
diaphragm or piston packing and the necessary valve parts, balls and seals. We can quote a
spare parts package for your metering system.
8

Troubleshooting

WARNING
• Explosion-proof pump only: it is essential that you observe the contents of section 9!
IMPORTANT
Follow instructions in the product's operating manual!
Fault
No metering pump intake
(during initial operation)
No metering although drive is Stroke setting 0 %
running (after longer period of
operation)
Metered liquid emerges from
leakage opening of delivery
unit
Loss of metering capacity
(after longer period of
operation)
Cause
Suction head too high
Backpressure in metering line
(delivery side)
Intake tank empty
Gas cushion in intake line and
liquid end
Diaphragm defective
Wearing parts in valves
defective
Deposits in valves
Corrective measures
Install pump closer to
intake tank
Eliminate backpressure
(e.g. via bypass line)
Increase stroke length
( 100 %)
Top up medium and restart
Bleed intake line, check for
leaks and restart
Replace diaphragm
Replace wearing parts
Clean or replace valve parts
ProMinent ProMinent ® ®