Prominent Sigma 1 Motor Driven Metering Pump

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.

Product Description

Prominent Sigma 1 Motor Driven Metering Pump

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.


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.

Control of Sigma Basic type (S1Ba)

Stroke length actuator/controller

Actuator:Electronically regulated actuator with contactless position detection for automatic stroke length adjustment, actuating period approx. 1 second for 1% stroke length, return potentiometer 1 kΩ, degree of protection IP 65.

Control drive: Electronically regulated actuator with position detection, with no contact with the media, consisting of an actuator and integral servo controller for stroke length adjustment via a standard signal. Standard current input 0/4-20 mA corresponds to stroke length 0 – 100%, switch-over for manual /automatic operation, stroke adjustment in manual mode, electronic stroke length position display, wide-range voltage power unit 85 – 265 V 50/60 Hz, degree of protection Ip65, actual value output 0/4-20 mA for remote display.


Speed controllers with frequency converter (identity code specification Z)

The speed control, assembled, consists of a frequency converter and a variable speed motor with 0.09 kW (Sigma 1 Ba), 0.37 kW (Sigma 2 Ba) or 0.55 kW (Sigma 3 Ba).

“Physiologically safe” designs in respect to wetted sealing material


The wetted materials in the “FDA” (F) version comply with the FDA Guidelines.

FDA Guidelines: Material PTFE: FDA No. 21 CFR § 177.1550, material PVDF: FDA No. 21 CFR § 177.2510

Available for pump design plastic (PV) and stainless steel (SS)

Identity code example: S1BaH04084PV F S000S000

EU Regulation 1935/2004

Sealing materials in accordance with Regulation (EC) 1935/2004 are available in the stainless steel material version “Physiologically safe for wetted material in accordance with Regulation (EC) 1935/2004”. Available for stainless steel (SS) pump design.

Dosing heads with a hygienic design are available on request for hygienically demanding applications.

Sigma / 1 Basic Type version “left liquid end “

This version offers additional adaptability to special installation situations, e.g. in combination with storage tanks, brackets, etc.

Identity code example: S1BaH07042PVTS00 5 S000


Type S1Ba With 1500 rpm motor at 50 Hz
Delivery rate at max. back pressure
bar l/h ml/stroke
12017 PVT 10 17 3.8
12017 SST 12 17 3.8
12035 PVT 10 35 4.0
12035 SST 12 35 4.0
10050 PVT 10 50 4.0
10050 SST 10 50 4.0
10022 PVT 10 22 5.0
10022 SST 10 22 5.0
10044 PVT 10 44 5.1
10044 SST 10 44 5.1
07065 PVT 7 65 5.2
07065 SST 7 65 5.2
07042 PVT 7 42 9.5
07042 SST 7 42 9.5
04084 PVT 4 84 9.7
04084 SST 4 84 9.7
04120 PVT 4 120 9.7
04120 SST 4 120 9.7


Performance data for TTT, see type PVT