Oscillations in the back pressure in the metering line, which could
lead to undesirable variations in the metering volume, are automat‐
ically compensated for by the power end/drive. This results in
dosing precision, which otherwise could only be achieved with
complex control circuits.
6.3
Capacity
The capacity set regulates the pump even in
‘Automatic’
mode
(not with SEK dosing heads).
By contrast, in conventional mode, the stroke length and stroke
rate determine the capacity. The stroke length can be adjusted
between 0 and 100% via the continuous display or the menu. A
metering volume of between 30 to 100% is reproduced as being
technically sensible (SEK type: 50 - 100%)! The stroke rate can be
set via the menu (not in "Analogue" operating mode) within a range
of 0 - 12,000 strokes/h.
6.4 Self-Bleeding
SER types
Self-bleeding liquid ends without bypass are capable of inde‐
pendent priming when a discharge line is connected and diverting
any air pockets present into the discharge line. During operation
they are also capable of conveying away gases which are pro‐
duced, independently of the operating pressure in the system.
SEK types
Self-bleeding liquid ends with ball are capable of independent pri‐
ming when a discharge line is connected and diverting any air
pockets present via a bypass. During operation they are also
capable of conveying away gases which are produced, independ‐
ently of the operating pressure in the system. It is also possible to
meter precisely under atmospheric pressure due to the integral
back pressure valve.
6.5 Operating modes
The operating modes are selected via the "Operating modes"
menu.
Refer to the "Hierarchy of Operating Modes, Functions and Fault
Statuses" for the order of the various operating modes, functions
and fault statuses.
‘Manual’
operating mode permits you to operate the pump man‐
ually.
This operating mode offers the option of activating the pump exter‐
nally by means of potential-free contacts (e.g. by means of a con‐
tact water meter). The "Pulse Control" option enables you to prese‐
lect the number of strokes (a scaling or transfer factor of 0.01 to
99.99) in the
‘Settings’
menu.
"Manual" operating mode
"Contact" operating mode
Functional description
26
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