
PROCESS ANALYTICS
Reverse Osmosis Systems
Reverse Osmosis Systems
Reverse osmosis (RO) systems are used for water treatment in many industrial applications. In reverse osmosis, dissolved salts are filtered out of the water, and contaminants and even nanoparticles (bacteria and viruses) are removed. This process is used for the treatment of ultra-pure water for power plants and drug production, as well as in drinking water treatment and water desalination.
Key Facts About the Application
Sector
Reverse osmosis systems
Application
3 applications (1. pH loop for verifying permeate quality, 2. Conductivity loop for verifying module leakage, 3. ORP loop for verifying concentrated water)
Measured Parameters
pH, conductivity, and ORP
Main Requirements
Inline measurement of pH value, ORP, and conductivity

Measurements in Ultra-Pure Water and Concentrated Water
Description of application
In power plants, the reverse osmosis system is used to produce boiler feed water for steam generation. The diagram shows a typical boiler feed water system with RO technology. pH value, redox potential, and conductivity must be monitored after every RO step and in every RO segment in the main collection pipe.
Requirement of the application
Reverse osmosis monitoring systems require the inline measurement of pH value, redox potential, and conductivity. Adding various chemicals during the process prevents organic or inorganic deposits from adhering to the osmosis membrane. If metering is not precise, the membrane can be damaged and favorable conditions for biological growth may be established. Consequence: The systems must be shut down and cleaned in a complex process. The option to measure conductivity values in the micron range and the setpoint deviation of redox potential and pH value is one of the main prerequisites for extending the service life of the membrane and saving the costs of early replacement. The quantity of chemicals used, including chlorine and sodium bisulfite, can be significantly reduced when conductivity, pH value, and redox potential are precisely measured.
Why Knick?
The SE604 conductivity sensor from Knick is the only sensor with removable outer electrodes for easy cleaning and handling. The recommended pH sensor, SE558, has an electrolyte reservoir for accurate, stable measurement in probes with low conductivity. The greatest flexibility possible with Knick transducers (e.g., Stratos Multi): one system for all measuring loops with flexible configuration.
Associated Products
SE558X/1-NMSN
SE565X/1-NMSN
SE558X/1-NMSN
SE565X/1-NMSN
SE558X/1-NMSN
SE565X/1-NMSN
SE558X/1-NMSN
Associated Industries and Applications
Overview of specific applications and product solutions in different areas of power plants.
Latest Blog Post

Apr 2017
Process Analytics
MemoRail Modbus
Powerful compact analyzer boosts performance while reducing costs

Feb 2017
Process Analytics
Conductivity
High-Precision Conductivity Measurement at Extreme Temperature Differences

Nov 2016
Process Analytics
Transmitter, FF, Profibus, HART
The Big Three of the Process Industry: HART, FF, Profibus

Mar 2025
Process Analytics
Pharma, Sensor, Conductivity
SE605H Conductivity Sensor with CondCheck

Jul 2024
Process Analytics
Achema
ACHEMA 2024 - Review and Impressions

Feb 2024
Process Analytics
Uniclean700, Launch
Uniclean 700 Series - Modular control system for automated sensor cleaning

Dec 2023
Company
|Interface Technology
|Process Analytics
Knick Austria - direct customer contact in Austria from 2024

Apr 2023
Process Analytics
Launch, Fitting, WA111
Robust WA111 Retractable Fitting Made of Plastic for Highly Corrosive Operating Conditions

Apr 2023
Process Analytics
Launch, Fitting, WA155
Successful joint project : Knick developed the special Ceramat WA 155 retractable fitting for optical probes from SOPAT

Apr 2023
Process Analytics
Conductivity, Phamacy, pH
pH and conductivity measurement in vaccine production

Apr 2023
Process Analytics
Sensor, Conductivity, SE625
Sturdy 2-Electrodes Conductivity Sensor SE625 with Coaxial Electrodes made of Titanium

Jan 2023
Process Analytics
ARD75
Sensor Adapter with Lock Function Enables Safe and Thorough Cleaning

Nov 2022
Process Analytics
Protos II 4400, Module
Up to six Sensors on one Transmitter Protos II 4400 via Modul MSU4400-180

Aug 2022
Process Analytics
Achema, Exhibition
ACHEMA 2022 - Knick at the world forum for the process industry

Jun 2022
Process Analytics
Sensor, pH, SE555, ORP
Combined pH- and ORP-Sensor SE555X/*-AMSN

Apr 2022
Process Analytics
MemoTrans
Ultra Compact Transmitter for Memosens Sensors

Feb 2022
Process Analytics
Protos II 4400, Stratos Multi, Software, ProgaLog
Conveniently configure transmitters offline on a PC - ProgaLog 4000

Feb 2022
Process Analytics
Stratos Multi, Transmitter
New Stratos Multi E461N transmitter with Profinet

Jan 2022
Process Analytics
Memosens
Memosens 2.0: Evolution of digital data transfer

Nov 2021
Process Analytics
Sensor, Conductivity, Ex, SE656, SE655
SE655X Digital and SE656X Digital - Digital Conductivity Sensors with Ex Certification

Nov 2021
Process Analytics
Exhibition, Switzerland, Ilmac
ILMAC 2021 in Basel - Trade Show Review by Knick Schweiz AG

Oct 2021
Process Analytics
Stratos Multi, Transmitter, Ex
Stratos Multi E401X- Multiparameter Transmitter for Hazardous Locations

May 2021
Process Analytics
Transmitters, Stratos Multi
Stratos Multi E471 with EtherNet/IP for process optimization

May 2021
Process Analytics
Sensor, Conductivity, Launch, SE656
New SE656N digital conductivity sensor

Mar 2021
Process Analytics
Protos II 4400, Profinet
Transmitter for the process industry with PROFINET module

Jul 2020
Process Analytics
Launch, Fitting, ARD170
High-quality immersion fitting for mobile applications

Jul 2020
Process Analytics
Fitting, ARD50, ARD75
Modular immersion fitting as an electrically conductive variant

Apr 2020
Process Analytics
Launch, Transmitters, Stratos Multi
New multiparameter transmitter Stratos Multi

Feb 2018
Process Analytics
Sensor, Fitting
How to get the sensor into the process

Apr 2017
Process Analytics
MemoRail Modbus
Powerful compact analyzer boosts performance while reducing costs

Feb 2017
Process Analytics
Conductivity
High-Precision Conductivity Measurement at Extreme Temperature Differences

Nov 2016
Process Analytics
Transmitter, FF, Profibus, HART
The Big Three of the Process Industry: HART, FF, Profibus

Mar 2025
Process Analytics
Pharma, Sensor, Conductivity
SE605H Conductivity Sensor with CondCheck

Jul 2024
Process Analytics
Achema
ACHEMA 2024 - Review and Impressions

Feb 2024
Process Analytics
Uniclean700, Launch