Reverse Osmosis Systems (RO)
Measuring in ultrapure and concentrated Water
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.
Reverse Osmosis Systems
Sector
3 Applications (1. pH Loop to check permeate quality 2. Cond Loop to check on module leakage 3. ORP loop to check concentrated water)
Application
pH, Cond and ORP
Measured Parameter
Key Requirements
- Inline measurement of pH value, ORP and conductivity
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.
Solution - Product Highlight
Features
- Dual channel any parameter
- Advanced diagnostics
- Memosens technology
- Namur status indications
- Hart, ProfiNet and EtherNet/IP communication options
Customer Benefit
- Small footprint due to double channel, split display
- Sensor diagnostics and alarm indication and transmission
(for Application 2)
Features
- Designed for low conductivity
- Viscous gel filling
- Inbuilt KCl reservoir
- 3 x ceramic junction
Customer Benefit
- No external KCl reservoir needed
- No contact problems due to Memosens technology
2-Electrode Conductivity Sensor SE604
(for Application 2 and 3)
Features
- 0.04 … 1,000 μS/cm
- Stainless steel 1.4435, PEEK insulator
- Up to 120 °C and 25 bar
- Available with Memosens technology
- Easy cleanability due to removable outer electrode
Customer Benefit
- Lowest measuring range
- Suitable for high pressures and temperatures
- Remote calibration by Memosens protocol
(for Application 3)
Features
- Sensor element: platinum plate
- Up to 135 °C, up to 6 bar
- Ceramic junction
- Viscous gel filling
- For aggressive media
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
(for Application 1)
Features
- Robust flow through fitting in polypropylene
- Various sensor and process connections
Customer Benefit
- Accurate measurement
- Suitable for moderate temperatures and high pressures
(for Application 2 and 3)
Features
- Robust flow through fitting in stainless steel
- Various sensor and process connections
Customer Benefit
- Accurate measurement
- Suitable for moderate temperatures and high pressures