11
n:1 Divisor
The pump makes
one dosing stroke
after the set number
of contact signals
has been received,
e.g. one stroke for
every 4 contact
signals for the
setting 4:1.
Even if the pump receives more contact signals than it can process at maximum stroke frequency, the pump runs for as long as
possible in continuous operation with a maximum stroke frequency.
8.4 Notes for stroke-length adjustment
In general, keep the stroke length setting as high as possible, and adjust
8.5 Pumps with manual deaeration
Manual deaeration of the dosing head (while the pump is running)
1 Open the deaeration valve (V) of the dosing head by approximately 1 turn (2 turns with Plus
3
system).
2. Press the "Start/Stop" button and keep it pressed.
– The pump switches to continuous operation.
3 Leave the pump running until the medium flowing from the deaeration line (J) is free of air bubbles.
4 Carefully close the deaeration valve.
9. Maintenance
In the event of a diaphragm leakage, the dosing liquid may leak out of the hole in the intermediate flange between
the pump and the dosing head. The parts inside the housing are protected from the dosing liquid for a short time
(depending on the type of liquid) by the housing sealing. It is necessary to check regularly (daily) if liquid is
leaking out of the intermediate flange.
For maximum safety, we recommend the pump version with diaphragm leakage detection.
9.1 General notes
Warning When dosing dangerous media,
observe the corresponding safety precautions! Risk of chemical burns! Wear protective clothing (gloves and
goggles) when working on the dosing head, connections or lines! Do not allow any chemicals to leak fromthe
pump. Collect and dispose of all chemicals correctly!
WarningThe pump housing must only be opened by personnel authorised byGrundfos Alldos!Repairs must only
be carried out by authorised and qualified personnel!Switch off the pump and disconnect it from the power
supply before carrying out maintenance work and repairs!
If possible, rinse the dosing head, e.g. by supplying it with water.
9.2 Maintenance intervals
At least every 12 months or after 4000 operating hours. When dosing crystallising liquids, more frequently.
In the event of a fault.
9.2.1 Cleaning the valves and diaphragm
• Clean the diaphragm and valves and replace, if necessary (for stainless-steel valves: inner valve parts).
9.3 Cleaning suction and discharge valves
9.3.1 Switching off the pump
1 Switch off the pump and disconnect it from the power supply.
2 Depressurise the system.
3 Take suitable steps to ensure that the returning dosing medium is safely collected.
9.3.2 Unscrewing suction and discharge valves/ cleaning valves
1 Unscrew the suction and discharge valves.
Dismantle the inner valve parts:Standard DN 4/DN 8 valve:See fig. 15 on page 327.
2 – Carefully push out the inner valve part using a thin wire nail (or paper clip) in the flow direction (see arrow on the
valve body).
To Next Page
Loading...
Need help?
General
