Demineralised water is essential in water-steam cycles and is often treated with specific chemicals to maintain system stability. These controlled chemical processes help preserve protective metal oxide layers and prevent gradual wear and corrosion of components exposed to water.
With more than 30 years of expertise, Swan Analytical provides a wide range of online instruments designed to monitor and control water quality across various systems, including steam cycles, auxiliary setups, demineralised water or polisher plants, process condensates, and cooling water cycles.
Understanding the importance of accurate, continuous measurements, Swan focuses on delivering reliable, low-maintenance instruments that ensure optimal water quality and the safe operation of all associated facilities.
Typical Instrumentation in Power and Steam Applications

1 | Raw Water Intake | pH UV254 (Organics Trend) Turbidity Disinfectant |
2 | Demineralised Water Treatment Plant | pH Sodium Silica Total Organic Carbon UV254 (Organics Trend) Turbidity Disinfectant |
3 | Demineralised Water Outlet | Specific Conductivity Total Organic Carbon Silica Sodium |
4 | Process Water Treatment Plant | pH Specific Conductivity UV254 (Organics Trend) Turbidity Disinfectant |
5 | Make-up Water | Specific Conductivity Silica Sodium |
6 | Condensate | pH Conductivity After Cation Exchange Sodium Dissolved Oxygen Specific Conductivity Degassed Conductivity After Cation Exchange Hydrazine (or CH6N4O Carbohydrazide) Turbidity |
7 | Condensate Polisher Outlet | Conductivity After Cation Exchange Sodium Specific Conductivity Silica |
8 | Feedwater | pH Value Specific Conductivity Conductivity After Cation Exchange Dissolved Oxygen Dissolved Hydrogen Hydrazine (or CH6N4O Carbohydrazide) Oxidation/Reduction Potential Turbidity |
9 | Boiler Water | pH Specific Conductivity Conductivity After Cation Exchange Sodium Silica Phosphate Turbidity |
10 | Saturated Steam | Conductivity After Cation Exchange Sodium Dissolved Hydrogen |
11 | Superheated / Reheated Steam | Conductivity After Cation Exchange Sodium Degassed Conductivity After Cation Exchangen Silica Dissolved Hydrogen |
12 | Cooling Water | pH Value Specific Conductivity Disinfectant Phosphate Turbidity |
13 | Return Condensate | pH Value Conductivity After Cation Exchange Specific Conductivity Degassed Conductivity After Cation Exchange Sodium Silica Dissolved Oxygen Turbidity |
14 | Effluents / Wastewater | pH Value Specific Conductivity Turbidity Phosphate Dissolved Oxygen |
* Italics indicates optional parameters depending on water quality, water treatment process, power plant configuration, operation mode, metallurgy and chemical treatment applied
Steam and Water Analysis System – SWAS
A Steam and Water Analysis System (SWAS) plays a vital role in monitoring and analysing the quality of water and steam in power generation facilities. Central to this system is the SWAS panel, which houses the essential instruments and controls for continuous sampling and analysis of critical water and steam parameters. These parameters are key to optimising power plant performance, reducing corrosion, and preventing scale buildup.
Swan Analytical New Zealand excels in delivering tailored solutions for water and steam analysis systems (SWAS). With our expertise, we help power generation facilities achieve peak efficiency, protect system integrity, and meet industry standards with confidence.
Contact us to find out more about our steam and water analysis solutions.

Power and Steam Water Monitoring Instruments
CONDUCTIVITY
HYDROGEN
HYDRAZINE
pH/REDOX (ORP)
SILICA
TOTAL ORGANIC CARBON (TOC)
DISINFECTANTS
OXYGEN
ORGANICS (UV254)
PHOSPHATE
SODIUM
TURBIDITY
