Reverse Osmosis – ND & NDFU Series 3
Reverse Osmosis – ND and NDFU Series 3
ND and ND/FU Series: 4300-6000 l/h Standard RO Systems. Stand-type unit for desalination of softened drinking water according to German drinking water regulations (free chlorine not detectable), operating on the principle of reverse osmosis. With RO 1000 controller and horizontal 8” membranes.
Stainless steel main frame housing the instruments and controls. Special inlet filter with 5 μm-filter cartridge, high pressure pump low noise, multi-stage centrifugal type (incl. frequency converter for ND/FU systems), low energy spirally wound modules with energy-efficient PA/PS composite membranes in GRP vessels with inliner.
Stainless steel main frame housing the instruments and controls. Special inlet filter with 5 μm-filter cartridge, high pressure pump low noise, multi-stage centrifugal type (incl. frequency converter for ND/FU systems), low energy spirally wound modules with energy-efficient PA/PS composite membranes in GRP vessels with inliner. Valves such as sampling valves for feed water and permeate (for each pressure vessel), inlet solenoid valve, valves made of stainless steel to regulate the flow rate of permeate, concentrate and concentrate recirculation. Pressure gauges for inlet and outlet pressure pre-filter, pump pressure, operating pressure and concentrate pressure, pressure switch for monitoring the feed water pressure. Flow meters for permeate, concentrate and concentrate recirculation flow rate. Conductivity measurement permeate, temperature compensated, measuring range 2 – 200 μS/cm. Control cabinet with lockable main switch, electrical switchgear with soft-starter for control of the high-pressure pump. Unit is completely wired, pre-assembled and ready for installation. Electrical equipment in accordance with VDE 0100
RO 1000 microprocessor control system
For fully automated monitoring and control of the reverse osmosis 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 pre-alarm, high conductivity fault, status signals: permeate discard, permeate recycling, concentrate displacement, concentrate rinse, intermittent rinse during shut-down, shut-down by external signal (forced stop, regeneration), LEDs for operation, 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 control system includes control functions for the limitron hardness monitoring unit), shut-downs by external signal (forced stop, regeneration), 2 universal inputs, Outputs for softening unit (230V/50Hz), 2 solenoid valves for concentrate rinse, permeate discard and recirculation, universal output, analogue output conductivity permeate (4-20 mA) and DDC (collective malfunction signal on floating changeover contact).
The unit is designed for a maximum TDS of 1,000 mg/l, a water temperature of 15°C, a maximum colloidal index of 3 and free permeate outlet. Under these conditions, the unit still reaches design permeate flow after three years of operation. The permeate recovery depends on the raw water quality and the type of pre-treatment.