6 Functional description
6.1
Liquid End
The dosing process is performed as follows: The diaphragm is pressed
into the dosing head; the pressure in the dosing head closes the suction
valve and the feed chemical flows through the discharge valve out of the
dosing head. The diaphragm is now drawn out of the dosing head; the dis‐
charge valve closes due to the negative pressure in the dosing head and
fresh feed chemical flows through the suction valve into the dosing head.
One cycle is completed.
6.2 Drive Unit
The diaphragm is driven by an electromagnet, which is controlled by an
electronic controller.
6.3 Capacity
The capacity is determined by the stroke length and the stroke rate.
The stroke length is adjusted by the stroke length adjustment knob within
a range of 0 ... 100 %. A stroke length of between 30 ... 100 % (SEK type:
50 ... 100 %) is recommended to achieve the specified reproducibility!
Data Value Unit
Recommended stroke length, standard
type
30 ... 100 %
Recommended stroke length, SEK type 50 ... 100 %
The stroke rate can be set within a range of 10 ... 100 % using the multi‐
functional switch.
6.4
Self-Bleeding
Self-bleeding liquid ends (SEK types) are capable of independent priming
when a discharge line is connected and diverting existent air pockets via a
bypass. During operation they are also capable of conveying away gases
which are produced, independently of the operating pressure in the
system. It is also possible to dose precisely in a depressurised state due
to the integral back pressure valve.
6.5
Operating modes
The operating modes are selected by means of the multifunctional switch.
As soon as the stroke rate has been set by the multifunctional switch, the
pump finds itself in "Manual" operating mode. 100% corresponds to 180
strokes/min.
The "External Contact" operating mode is described below in the "Opera‐
tion" and "Installation, Electrical" chapters.
The "External Analogue" operating mode is described below in the "Ope‐
ration" and "Installation, Electrical" chapters.
"Manual" operating mode
"External contact" operating mode
"External Analogue" operating mode
Functional description
17
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