4 Functional description
‘EcoPro’metering pumps are diaphragm metering pumps powered by an electric motor to
transport clean, non-abrasive dosing media.
The stepper motor technology used here means that both the suction stroke duration and
metering stroke duration can be adjusted separately
.
This results in a variety of benefits such as a large setting range, virtually continuous and
low-pulsation metering, and even the option to respond to high viscosity or challenging
intake conditions.
The delivery rate can be regulated by a trimming potentiometer. A reduction in quantity
means an extension in the metering stroke duration. The duration of the suction stroke
remains unchanged here. By selecting another metering mode, the suction stroke duration
can be adapted to higher viscosities or to difficult intake conditions.
Fig. 2: Time distribution (t) of the suction (s) and metering stroke (p) at a metering rate setting of 100, 50 and 25%
A low-noise stepper motor moves a metering diaphragm via an
eccentric piston rod (in type 00510X) or via an eccentric
gearbox (in all other types).
During the suction stroke, a vacuum is generated through the
reverse motion of the diaphragm, and the metering medium is
drawn into the pump head through the suction valve.
During the pressure stroke, the diaphragm is moved forward,
creating excess pressure, and the medium is pressed into the
metering line by the pressure valve.
Functional description
24417102264 Rev. 5-01.2019
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