Motor-Driven Metering Pump Sigma/ 1 (Basic type)

Capacity range 17 – 144 l/h, 12 – 4 bar

The Sigma/ 1 Basic is an extremely robust motor-driven metering pump with patented multi-layer safety diaphragm for excellent process reliability. It offers a wide range of power end designs, such as three-phase or 1-phase AC motors, also for use in areas at risk from explosion.

The robust pump for safe and reliable use

The Sigma/ 1 diaphragm metering pump, together with pumps of type Sigma/ 2 and Sigma/ 3, represents an integrated product range. They cover the capacity range from 17 to 1,030 l/h, with a consistent operating concept, control concept and spare parts management. A wide range of power end versions is available, including some for use in areas at risk from explosion.
Your benefits

Excellent process reliability:
    In the event of an accident, the feed chemical does not escape to the outside nor into the pump's power end, thanks to the patented multi-layer safety diaphragm with optical (optionally electric) signalling.
    Integrated relief valve to protect the pump from overloading.
    Reliable operation by bleed option during the suction process.

Flexible adaptation to the process:
    The entire Sigma product range is available as standard in a "Physiologically safe in respect of wetted materials" design.
    Metering pumps with electro-polished stainless steel metering head enable them to be used in hygienically challenging applications.
    Adaptation to specific installation situations, as the "Liquid end on left" option can be selected as standard.

Field of application

    Volume-proportional addition of chemicals in water treatment, e.g. sodium-calcium hypochlorite for the disinfection of potable water
    Addition of chemicals depending on the measured value, e.g. metering of acid and alkali for pH neutralisation in waste water treatment
    Time-controlled addition of chemicals in the cooling water circuit
    Pulse-controlled metering in the bottling of different volumes e.g. glycerin filling of manometers

Technical Details

•     Stroke length: 4 mm.
•     Stroke length adjustment range: 0 – 100%.
•     Stroke length adjustment: manually by self-locking rotary dial in 1 % increments (optionally with actuator or control drive).
•     Metering reproducibility is better than ±2% in the 30 – 100% stroke length adjustment range under defined conditions and with correct installation.
•     Wetted materials: PVDF, stainless steel 1.4571/1.4404, special materials on request.
•     Patented multi-layer safety diaphragm with optical diaphragm rupture display (optionally with diaphragm rupture warning system via a contact).
•     Integrated hydraulic relief and bleed valve.
•     A wide range of power end versions is available: Three-phase standard motor, 1-phase AC motor, motors for use in areas at risk from explosion and different flange designs for use in customer-specific motors.
•     For use in areas at risk from explosion II 2G Ex h IIC T3 Gb X or II 2G Ex h IIC T4 Gb X (optional).
•     Degree of protection IP 55.
•     Fibreglass-reinforced plastic housing.
•     Liquid end on left is available as standard.
•     For reasons of safety, provide suitable overload protection mechanisms when installing all mechanically deflected diaphragm metering pumps.