5 Functional Description
5.1
Pump
The metering pump is an oscillating diaphragm pump, the stroke length of
which can be adjusted. An electric motor drives the pump. The slide rod
transmits the stoke motion to the diaphragms.
The stroke movement of the displacement body is continuously measured
and regulated so that the stroke is executed according to a previously set
dosing profile, see chapter
„Metering“
„setting“
.
The following dosing profiles are available:
n Normal
n Discharge opti.
n Suction opti.
Every metering profile is ineffective below the switch-
over frequency for Start/Stop mode.
Normal
0
s s
a)
180 360 0
b)
180 360
ω ω
P_PL_0009_SW
Fig. 6: Stroke movement at a) maximum stroke length and b) reduced
stroke length.
s Stroke velocity
⍵ Cam rotational angle
+ Discharge stroke
- Suction stroke
Discharge opti.
With a discharge optimised dosing profile, the discharge stroke is elon‐
gated, the suction stroke is executed as quickly as possible. This setting is
for example suitable for those applications that require optimum mixing
ratios and as continuous as possible chemical mixing.
Suction opti.
Illustration of the stroke movement
Functional Description
18
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