ProMinent Fluid Controls has announced that its range of Spectra progressive cavity pumps has been completely updated to cover lower and higher flows: the range is suitable for pumping liquid polymers and polymer solutions and is used on the ProMinent Ultromat flocculant preparation and dosing systems. It now features 10 models instead of the previous six and features units with both lower and higher flow rates than were previously available. The pump range has a capacity of 0.6 – 12,000 l/hr with at back pressures of 3 – 12 bar. All models are available with 3 drive variants: a variable speed drive motor (manually operated gear box), helical geared motor or a helical geared motor with thermistor sensors. The pump can handle fluids with viscosity up to 5000 mPas. Rotors are manufactured from stainless steel (CrNiMo 17-12-2) and stators in FPM. There are 3 different rotor-stator geometries. The âSâ? geometry is used on models offering flow rates from 0,6 – 105 l/ hr at 3 bar, âLâ? geometry for models in the range 50 – 600 l/hr at 3 bar and âPâ? geometry for models covering the range 300-12,000 l/hr at 3 bar.