UO 3500 BW
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UO 5000 SW


For desalination of hardness stabilized seawater operating on the principle of reverse osmosis for a total salt content up to 45,000 mg/l at 25°C. Capacity 120 – 480 m³ / day.

Up to 50% energy savings due to Variable frequency drive VFD and EnergyRecoverySystem Turbocharger.

Brand Herco
  • Complete unit skid mounted
  • RO 1000 controller
  • Recovery from 28% to 33% (depends on type)
  • Salt rejection percentage: min. 98,5%
  • Design pressure: 65 bar
  • Voltage: 3 x 400V / 50 Hz
  • Analogue flow meters

Unit design

  • Stainless steel main frame seawater resistant.
  • Special inlet filter in PP with 10 µm – filter cartridges,
  • Barrel-type high pressure pump with Variable frequency drive VDF and EnergyRecoverySystem Turbocharger
  • Seawater-spirally wounded module(s) with energy-efficient PA/PS composite membrane in GRP vessel with inliner.
  • Valves such as sampling valves for feed water and permeate (for each pressure vessel), automatic inlet valve, valves to regulate the flow rate of permeate and concentrate.
  • Pressure switch for pump feed pressure, pressure gauges for inlet and outlet pressure pre-filters, pump pressure, operating pressure and concentrate pressure.
  • Conductivity measurement permeate with temperature compensation.
  • Flushing device for automated cycle flushing of the unit with permeate, consisting  of permeate tank and pump, integrated injection point post-chlorination (option)
  • Control cabinet with lockable main switch, electrical switchgear for control of the RO-unit esp. of the VFD of high pressure pump.
  • Unit completely piped in seawater resistant material (1.4462), wired and pre-assembled and ready for installation. Electrical equipment in accordance with VDE 0100 part 600, VDE 0113 part 1.

RO 1000 microprocessor control system

  • For fully automated monitoring and control of the reverse omosis unit with two-line LCD (16 characters per line) and process-visualisation of
  • Operating data: permeate conductivity (temperature-corrected-, permeate temperature, operating hours,
  • Malfunction signals: low pressure, hard water, motor overload, high conductivity prealarm, high conductivity fault, status signal: permeate discard, permeate recycling, concentrate displacement, concentrate rinse, intermittent rinse during shut-down, shut-down by external signal (forced stop, regeneration), LEDs for operations, malfunction, regeneration, discard, disinfection and full tank.
  • Inputs (low voltage) for level control with 1 or 2 float switches, hardness monitoring unit (the RO 1000 controlsystem includes control functions for the limitron hardness monitoring units), shut-downs by external signal (forced stop, regeneration), 2 universal inputs.
  • Outputs for softening unit (230V/50HZ), 2 solenoid valves for concentrate rins, permeate discard and recirculation, universal output, analogue output conductivity permate (4–20 mA) and DDC (collective malfunction signal on floating changeover contact).
Options Version with frequency converter (energy savings) on demand

Flushing with Permeat as option

Footnotes The units are designed for a maximum TDS of 45.000 mg/l, a water temperateure of 25°c, a maximum colloidal index of 3 and free permeate outlet. Under these conditions, the units still reach design permeate flow after one year of operation. The permeate recovery depends on the raw water quality and the type of pre-treatment.Effectivity in energy-recovery makes a value of energy-consumption of 5 kWh/m³ permeate.
Height 1900 mm
Membranes 8040 x 8
Controller RO 1000
Flow Rate 5000 l/h
Width 5800 mm
Permeate Flow 5000 l/h
Recovery 98,5 %
Max Operating Pressure 65 bar
Feedwater Connection DN 65
Permeate/Concentrate Connection DN 32/40
Minimal Salt Rejection 98.5 %
Voltage 3 x 400V/50Hz
Motor Power 30 Kw
Feedwater Pressure min./max. 2/6 bar
Feedwater Temperature min./max. 5/35 °c
Ambient Temperature Max. 40°c
Weight 1200 kg
Depth 1000 mm