ProMinent alpha ALPc 0230, Руководство по эксплуатации, Страница: 25 / 52

–
Reliable metering cannot be guar‐
anteed after the metering pump
has been idle for some time, as
the feed chemical can crystallise in
the valves and on the diaphragm.
Regularly check the valves and
diaphragm.
–
The metering pump should prime
at 100% stroke length, as the pri‐
ming lift depends on the stroke
volume when the liquid end is
empty. If the metering pump has to
prime at a smaller stroke length
and is not priming, reduce the pri‐
ming lift (i.e. briefly lift up the
storage tank with the feed chem‐
ical).
Draining the liquid end
With feed chemicals that should not come into
contact with water.
1. Turn the pump so that the pressure con‐
nector is facing downwards.
2. Allow water to flow out of the liquid end.
3. Flush the suction connector from above
with a suitable medium or blast with
compressed air.
Starting up the metering pump
1.
Fill the liquid end -
Ä
‘Filling the liquid
end’ on page 26 .
2. Check the pump connectors and con‐
nections for leak-tightness.
3. Check the suction valve and discharge
valve for leak-tightness and tighten if
necessary.
4. Check the liquid end for leak-tightness
and tighten the screws on the dosing
head if necessary - see below for
starting torque.
5. Only with bleed valve: Check whether
the bleed valve is closed.
Start up
25