ProMinent
®
Page 7
Design and Function
3 Design and Function
Main components Operating panel
Power end
Liquid end
Operating Principle Chemical feed occurs as a result of pulsed deflections of the dosing diaphragm within the liquid
end, which causes pressure differentiation between the suction side, the liquid end cavity and the
discharge side. The pressure differentiation causes the suction and discharge self-acting valves
to open and close, resulting in chemical feed.
The dosing diaphragm is driven by an electromagnet, which is stimulated and controlled by a
microprocessor.
Pump Capacity The feed rate is determined by the stroke length and stroking rate.
The stroke length is adjustable between 0 % and 100 % using the stroke length adjustment knob.
However reproducibility is only technically practicable in the adjustment range of between 30 %
and 100 %.
Stroking rate is adjustable in 10 % steps between 0 % and 100 % using the multifunction switch.
This gives a higher rate of reproducible metering accuracy.
Operating Modes Operating modes are selected using the multifunction switch.
Three LED displays indicate operating and fault status.
Internal operating mode: ”Manual“:
Stroking rate is manually adjustable in 10 % steps via the multifunction switch.
”External“ operating mode:
Allows adjustment of individual strokes via the external operating mode terminal by means of
contact or semi-operating devices.
Functions ”Auxiliary Frequency“ function:
Enables activation of optionally selectable and programmable stroking rate, controlled via the
external operating mode terminal. This stroking rate overrides ”Manual“ and ”External“ operating
modes.
In the standard version the ”Auxiliary Frequency“ function is programmed to 100 % stroking rate.
”Pause“ function:
The external operating terminal can be used to operate a remote pump stop function.
”Stop“ function:
This function allows the pump to be deactivated without disconnecting from the power supply.
”Test“ function:
This function checks the priming function of the pump. The switch setting ”Test“ on the
multifunction switch is self-locking.
Self-degassing Self-degassing metering pumps are used in closed discharge lines to create suction and to direct
trapped air to bypass lines, and/or remove gas emitted by gaseous chemicals during operation,
independently of existing back pressure.
Installing a back pressure valve ensures precise chemical feed can be achieved, even when
operating under atmospheric pressure.
Options The float switch connector can be used to connect a two stage float switch.
There is also optionally available a relay terminal for an alarm indicating relay, and a switch output
which is synchronised to each stroke.
BA_BE_021_07_08_GB2.p65 17.07.2008, 14:35 Uhr7
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