Water Quality


Increasingly stringent discharge standards require removal of pollutants to very low levels while environmental and financial sustainability goals require minimizing energy and resource consumption. This is driving a change in the industry from 'treatment' to 'resource recovery'.

Wastewater Process Monitors and Sensors

YSI IQ SensorNet is a network of online controllers and sensors designed for process monitoring and control at wastewater treatment plants.

IQ SensorNet 2020 3G Controller

With a scalable solution, the 2020 3G allows for the measurement of up to 20 parameters.


IQ SensorNet 282/284 Controller

With an easily scalable solution, the 282 and 284 controllers can connect to 1-4 sensors, allowing up to 20 parameters to be measured.

IQ SensorNet AmmoLyt® Plus Sensors

Rugged, ion selective electrode (ISE) probe for the IQ SensorNet process monitoring system.


IQ SensorNet VARiON® Plus Sensors

Provides continuous and reagentless monitoring of Ammonium, Nitrate, Potassium and Chloride simultaneously.

IQ SensorNet FDO® Dissolved Oxygen Probes

Reliable, proven, long-term solution for continuous DO monitoring that can help optimize your aeration system and lower energy costs. 

IQ SensorNet SensoLyt® 700 IQ Sensors

Provides continuous monitoring of pH or ORP for IQ SensorNet systems.


IQ SensorNet Interface Level (IFL) Probes

Provides continuous sludge level data to assist with operational efficiency improvement decisions.


IQ SensorNet Optical UV Absorption Probe

Measures UVT-254 and SAC (spectral absorption coefficient - total and soluble) and can provide correlated values for COD, TOC, BOD and DOC. 

IQ SensorNet ViSolid® Suspended Solids Probe

Reflectance-based TSS (total suspended solids) probe for the IQ SensorNet process monitoring system.

IQ SensorNet Alyza Analyzer PO4 

The NEW IQ Analyzer features a revolutionary MultiValve that dramatically reduces reagent use and maintenance requirements. 

YSI Resource Library

Manuals, FAQs, Video, MSDSs, Calibration Tip Sheets, Guides - if it’s about a YSI Product you’ll find it here in our Resource Library.


Case Studies


WWTP Utilizes Online Instrumentation and SCADA to Keep Operating Costs Low and Effluent Quality High

Providing the best value to wastewater customers requires a team of operators that have a deep sense of ownership and are committed to continuous improvement.

IQ SensorNet Simplifies Wastewater Nutrient Removal

Naturally-occurring types of nitrogen include ammonia, nitrite, and nitrate, and levels are typically low – less than 1 mg/L. On the other hand, the discharge of a WRRF can contain levels as high as 30 mg N/L, primarily in the form of nitrate (NO3-), which can wreak havoc on any aquatic ecosystem.       

How Orthophosphate Analyzers Can Help Control Pipe Corrosion in Drinking Water

Perhaps the most crucial benefit to dosing phosphate in drinking water is its ability to prevent corrosion of lead and copper from the piping, reducing the risk of health concerns.  

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