ProMinent Sigma/1 Explosion-Proof: Metering Pump for Explosion-Proof Applications

ProMinent® Sigma/1 Explosion-Proof: Metering Pump for Explosion-Proof Applications

Safe for Hazardous Metering 
The choice for simple metering in hazardous applications. The ProMinent® Sigma/1 Explosion-Proof motorized pump may be operated manually by adjusting the stroke length knob (displacement per stroke) at a constant stroke frequency using a constant or variable speed motor. Automatic control of displacement per stroke via analog (4-20mA) signal is possible with optional motorized stroke positioning systems (Also Explosion-Proof).

The ProMinent® Sigma/1 is a mechanicallyactuated diaphragm metering pump capable of flow rates to 38 gph (144 L/h) and pressures up to 174 PSI (12 bar).

Features and benefits

  • UL listed, CSA certified, Class I Groups C&D and Class II Groups F&G
  • Safe metering in hazardous/classified areas
  • Mechanically-actuated diaphragm metering pump
  • Rugged metal inner casing for components, with a corrosion-resistant housing
  • PVDF and stainless steel liquid ends available
  • Three drive versions available
  • Reproducible metering accuracy at defined conditions and correct installation better than ±2% (stroke length area 30-100 %)


  • Chemical process
  • Mining
  • Petrochemical
  • Heavy industrial
  • Pharmaceutical
  • Fine dust environments
  • Generally hazardous areas


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