12
1.1.2007 / PM Chap. 2
ProMinent
®
ProMinent
®
Sigma Controller
pk_2_104
B
A
pk_2_003
pk_2_115
The ProMinent
®
Sigma microprocessor version (standard IP 65) allows rapid and reliable
adjustment to fluctuating metering requirements.
The controller has the same control panel as the ProMinent
®
gamma/ L metering pump.
The microprocessor controller of the Sigma pumps, featuring the optimum combination of
variable AC frequency combined with digital stroking frequency, ensures exact metering even
in the lower minimum range due to individual stroke control.
The individual pump functions are simply adjusted using the five programming keys. A backlit
LCD indicates the current operating status, LEDs function as operation or fault indicators and
fault indicator or pacing relays monitor the pump function.
Central or decentral adjustment is possible with PROFIBUS
®
and/or
an integrated process timer.
ProMinent
®
Sigma Basistyp (S2Ba)
The ProMinent
®
Sigma Basic type is a motor driven metering pump with no internal electronic
control system. The ProMinent
®
S2Ba offers a variety of different drive options in both the
three phase standard motor (standard: IP 55) or the single phase AC versions. We also supply
metering pumps with ATEX-approval for use in EXe and EXde zones.
Different flanges are always available so that customers can use their own motor to drive the
pump.
ProMinent
®
Sigma Basic Type (S2Ba)
ProMinent
®
Sigma Control Type (S2Ca)
Integrated Relief-/Bleed Valve (B)
A liquid end variant with integrated hydraulic relief valve is optionally available for pressure
ratings 4, 7, 10 and 16 bar. It protects the pump against overload and potential damage with
no additional installation. This represents a considerable saving to the operator.
The integrated pressure relief valve offers the further advantage of effective bleeding of the
injection valve during intake.
2.3 ProMinent
®
Sigma/ 2
Diaphragm Metering Pumps
The ProMinent
®
Sigma/ 2 diaphragm metering pump has a high strength metal-lined housing
for those components subject to load, and an additional plastic housing to protect against
corrosion. It has a capacity range of 50-420 l/h at a max. back pressure of 4-16 bar. The
pump capacity is adjusted by varying the stroke length (5 mm) in 0.5 % steps via a self
locking adjusting knob.
The reproducible metering accuracy is better than ±2 % providing installation has been
correctly carried out, and in the stroke length range of 30-100 %. (instructions in the operating
instructions manual must be followed.)
The stable, corrosion resistant metal and plastic housing is rated IP 65. To facilitate adaptation
of the pumps to the widest possible range of processing requirements we offer a choice of
three gearbox ratios, three liquid end sizes, two liquid end materials and either contact or
analogue signal (e.g. 0/4-20 mA) control options in the form of the S2Ca Sigma controller.
For safety reasons, all motor driven metering pumps must be equipped with adequate
protection against electrical overload.
2.3.1 ProMinent
®
Sigma/ 2 Diaphragm Metering Pumps
Diaphragm Failure Indication (A)
The liquid end may be supplied with an optional safety diaphragm.
A plastic chemical resistant end disc separates the drive housing from the liquid section, and
protects the drive against corrosion in case of diaphragm rupture. The new diaphragm rupture
system means that the liquid section is hermetically sealed in the event of diaphragm rupture.
This has the great advantage that the feed chemicals cannot escape from the pump. In
association with the S2Ca, diaphragm rupture is simultaneously indicated via the LCD. At this
point it is possible to opt for continuation of the metering, or to stop the metering pump.
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