PROCESS ANALYTICS

Reverse Osmosis Systems

Reverse Osmosis Systems (RO)

Reverse osmosis (RO) systems are used in a wide range of industrial applications for water treatment. Reverse osmosis not only filters dissolved salts from the water, but also removes contaminants and even nanoparticles (bacteria and viruses). The process is used to derive ultrapure water for power plants and pharmaceutical production, as well as for treating potable water and for desalination.

Energy

Keyfacts Application

Sector

Reverse Osmosis Systems

Application

3 Applications

pH Loop to check permeate quality
Cond Loop to check on module leakage
ORP loop to check concentrated water

Measured Parameter

pH, Cond and ORP

Key Requirements

Inline measurement of pH value, ORP and conductivity

Measuring in ultrapure and concentrated Water

Application Description

In a power plant, the reverse osmosis system is used to produce the boiler feed water for steam production. The schematic shows of a typical boiler feedwater system based on RO technology. pH, ORP and conductivity need to be monitored after each RO step and in each RO train in the main header.

Requirements of Application

Monitoring reverse osmosis systems requires inline measurement of the pH value, ORP and conductivity. Adding a variety of chemicals during the process prevents organic or inorganic deposits from building up on the osmosis membrane. Imprecise dosing can lead to membrane damage and biological growth as well. As a consequence, systems must be shut down and cleaned extensively. The ability to measure micro conductivity values and the setpoint deviation of ORP and pH values is a key prerequisite for extending membrane service life and saving the cost of premature replacement The amount of chemicals such as chlorine and sodium bisulfite used can be significantly reduced when conductivity, pH and ORP are precisely recorded.

Why Knick ?
Knick’s conductivity sensor SE604 is the only sensor with removable outer electrodes for easy cleaning and handling. The recommended pH sensor SE558 has an extra electrolyte reservoir for accurate and stable measurements in samples with low conductivity. Fullest flexibility with Knick’s transmitters (e.g. Stratos Multi): one system for all measurement points with flexible parameter configuration.

Matching Products

SE558 pH Sensor | Memosens | 120 mm | Ex | For ultrapure water, water and analytical chemistry

Product number:

SE558X/1-NMSN

SE604 2-Electrode Conductivity Sensor | 7-Pole | Measuring range from 1 nS/cm to 1000 μS/cm

Product number:

SE604

SE565 ORP Sensor | Memosens | 120 mm | Ex | For hygienic processes and sterile applications

Product number:

SE565X/1-NMSN

ARF201 Flow-Through Fitting | PP-H | One sensor

Product number:

ARF201

ARF200 Flow-Through Fitting | Stainless steel or Hastelloy C22 | One sensor | Process connection via cutting ring coupling

Product number:

ARF200

Stratos Multi E461N Multiparameter Transmitter | Memosens/Analog Sensors | 1-Channel |PROFINET | 2x 4…20 mA Outputs

Product number:

E461N

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Power Industry Brochure

Overview of energy-specific applications and product solutions

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