Stand-type unit for desalination of softened drinking water according to UK drinking water regulations (free chlorine not detectable), operating on the principle of reverse osmosis.

The reverse osmosis units type UO-ED are designed for supply of permeate with a backpressure of up to 7 bar. Therefore they are perfectly suitable for permeate supply for different points of use (e.g. humidifiers). An electrical signal for demand of permeate is not necessary.

Unit design

Stainless steel base frame with plastic front panel housing the instruments and controls.
Special inlet filter with 5 µm-filter cartridge and 2 pressure gauges, High pressure pump, low-noise, multi-stage centrifugal type, Low energy wound modules with energy saving PA/PS com-posite membranes in GRP pressure vessels with inliner.

Valves and instruments including feedwater sampling valve, solenoid inlet valve, pressure switches for feed water and permeate, permeate and concentrate flow meter, vibration-resistant pressure gauges for pump and concentrate pressure, stainless steel valves for adustment of permeate and con-centrate flow rate, solenoid valves for internal permeate recirculation or permeate supply, diaphragm pressure vessel for permeate.
Microprocessor control system, as described below, Electrical switch gear for control of the high pressure pump, lockable main switch. Connecting cable (3 m) with 16 A - 6 h CEE five-pole plug.

RO 1000 microprocessor control system for fully automated monitoring and control of the sys-tem with two line next display (16 characters per line) for display of operational status, permeate conductivity, temperature, operating hours, password-protected programming of the operating se-quences and parameters as described below. Operators functions with password on different levels, low pressure shut down, conductivity limit fault and conductivity limit pre-alarm, malfunction dis-plays for low pressure, hard water, motor overload, high conductivity pre-alarm, power supply malfunction.

Programming options for the following operating status with selectable duration:
- discard of permeate, subject to conductivity, with time limit
- discard of permeate, subject to time
- shut-down at high conductivity
- failure acknowledgement with or without password
- operators functions via password on different levels
- low pressure shut-down 0-99 sec.
- conductivity limit delay 0-99 min.
- conductivity limit fault 2-200 µS/cm
- conductivity limit prealarm 2-200 µS/cm
- interval for intermittent rinse when “tank full” 0-99 h
- duration of rinse when “tank full” 0-99 min.
- duration of concentrate displacement 0-99 min.
- duration of concentrate rinse 0-99 min.
- duration of permeate discard accord. to conductivity 1-99 min.
- range of permeate conductivity 2-200 µS/cm
- pump delay 0-9.9 sec.
- language German/English/French/Italian
- individual test of all inputs or outputs with LCD (diagnostics)

Additional connections possible: 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-down by external signal (forced stop, regeneration), Outputs for softener (230 V/50 Hz), 2 solenoid valves for concentrate rinse, permeate discard and -recycling, and DDC (collective malfunction signal on volt-free changeover contact).

Unit is completely wired, pre-assembled and ready for installation. Electrical equipment in accordance with VDE 0100 part 600, VDE 113 part 1.

The units are 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 units still reach design permeate flow after three years of operation. The permeate recovery depends on the raw water quality and the type of pre-treatment.

Optional Equipment

Hardness Monitoring Unit limitron _" for constant monitoring of the feedwater hardness, not integrateable in the reverse osmosis unit. Code-no. 370038