• Process safety: In case of average, dosing medium does not escape to the environment or into the pump gear, thanks to multi-layer safety diaphragm with diaphragm rupture display or signaling.
• Ventilation option provides functional reliability.
• Protection of the pump against overload with integrated relief valve.
• High process quality: reproducible dosing accuracy better than ±2 %.
• Easy handling: direct adjustment and control of dosing capacity in plain language via the big illuminated LC display (Control version)
• Problem-free connection to complex process control systems with optional equipment with PROFIBUS-DP or CanOpen interface (Control version)
• Simplified spare parts management and decreased stock handling efforts at same availability of pumps within the Sigma product line.
• Less training efforts for operating staff when handling the Sigma product line, thanks to same operation modus.

• Quantity-proportional chemical addition in water treatment, e.g. Sodium Hypochlorite for drinking water disinfection.
• Measurement-dependent chemical addition, e.g. acid and brine dosing for pH neutralization in waste water treatment
• Time-controlled chemical addition in cooling water circuits.
• Pulse-controlled dosing when bottling different volumina, e.g. glycerine filling of manometres.

• Capacity range 50 - 420 l/h, 16 - 4 bar
• High-strength inner housing for energy-stressed components as well as additional polymer housing as protection against corrosion.
• Stroke length: 5 mm, adjustable via self-arresting adjusting knob in 0.5 % steps.
• Multi-layer safety diaphragm with diaphragm rupture display as standard, i.e. even should the diaphragm rupture the feed chemical cannot escape from the pump unchecked or penetrate the pump drive.
• Liquid end materials: PVDF, stainless steel 1.4571/ 1.4404
• Reproducible dosing accuracy at defined conditions and correct installation better than ±2 % (stroke length area 30-100 %)
• Integrated hydraulic relief valve: protection of pump against overload without complex extra-installations and costs as well as problem-free bleeding of metering pump during suction process.
• For high pressure rates a plunger version for up to 320 bar is available

Features Basic type (S2Ba)

• Broad selection of drive versions: three-phase norm motor, single-phase alternating current motor, motors for the use in EXe and EXde areas, various flange versions for the use of customer-specific motors.
• Protection class IP 55 (optionally ATEX-T3/T4)
• Stroke-length adjustment: manually (optionally with stroke positioning drive or with stroke control drive)

Features Control Version (S2Ca)

• Microprocessor control: 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.
• Big backlit LCD
• Indication in plain language of metering capacity in l/h or US-gal/h
• 3-LED-function as operation indicator, alarm indicator and fault indicator.
• Control via contact or analogue signals (e.g. 0/4-20 mA)
• On demand, integration of 2-week-process timer. The intelligent alternative to clock timers.
• Protection class IP 65
• Interface for PROFIBUS-DP PROFI or CanOpen

1. For the Sigma control types, the 60 Hz performance data apply (because internal 60 Hz operation), however, at max. 200 strokes/min.
2. For the Sigma types 07120, 07220 and 04350, the valves in the liquid end are designed in DN 25 (G 1 1/2). Since DN 20 is normally sufficiently large for the piping of these versions (see technical data, connection suction/pressure side), the connecting parts available for ordering in the Identcode (e.g. inserts) are already reduced to DN 20, i.e. piping and accessories can be executed in DN 20.