Wastewater System

With YSI, you have a choice.

YSI IQ SensorNet is a network of online controllers and sensors designed for process monitoring and control at wastewater treatment plants. IQ SensorNet continuously monitors water quality throughout the wastewater treatment process, from the influent through the effluent, increasing operational efficiency, lowering operating costs and improving performance. Ensure that your water resource recovery facility is within compliance and under budget with YSI’s wastewater instrumentation.

YSI IQ SensorNet System Overview.

IQ SensorNet is a modular system of controllers, modules and sensors that can be customized to meet your facility’s needs. With its scalability, IQ SensorNet can be expanded at any time as your facility’s needs evolve – simply add a sensor or module to your existing network.

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With IQ SensorNet, benefit from:

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Full Sensor Offering

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UltraClean Technology

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One Cable Design

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Quick Repair Time

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Reliable ISE Sensors

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Warranties Best in Industry

YSI has been a trusted partner in the municipal industry for decades and, now more than ever, municipalities need a partner with the ability to improve their operational efficiency and increase cost savings. We are here to support your good work with YSI’s IQ SensorNet system for continuous wastewater process monitoring and control, along with our extensive network of experts. With YSI, You Have a Choice in online sensors and controllers.

Measure Multiple Parameters

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IQ SensorNet is available as a 20-probe network with the 2020 3G Controller a 2-probe network with the 282 controller or a 4-probe networks with the 284 controller. All controllers can measure up to 20 parameters, plus secondary parameters such as temperature.

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Full Suite of Probes

dissolved oxygen wastewater sensor

Dissolved Oxygen (DO) - The FDO is a luminescence-based, optical DO sensor for continuous monitoring that can help optimize your aeration system and lower energy costs. The FDO has a replaceable sensor cap for longer life and simple maintenance.

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tss sensor

Total Suspended Solids (TSS) - The ViSolid is a versatile, reflectance-based TSS probe available with 2 factory calibrations. One is designed for monitoring MLSS, RAS, and WAS, and the other for monitoring primary sludge and thickened sludge.

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turbidity sensor

Turbidity - The VisoTurb is an optical based turbidity or TSS sensor that features multi-point factory calibration and UltraCleanTM ultrasonic cleaning for maintenance free operation. The sensor utilizes nephelometric measurement technology which is an ISO compliant method.

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Selecting an Ion Selective Electrode (ISE) Probe

ISE wastewater sensor

Control Confidently with YSI ISE Probes

  • Find ISE probes with extended lifespans.
    Expect 18+ months of use from YSI's electrodes, and our warranty covers the first year of operation.
  • Avoid ISE probes with combined sensor cartridges.
    YSI's individually user-replaceable electrodes maximize your investment.
  • Look for robust probes.
    YSI's probes are built with materials like stainless steel and sensing elements are protected with metal screens to incresase durability and longevity.
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Ammonium and Nitrate - VARiON, AmmoLyt, and NitraLyt sensors are rugged ion selective electrode (ISE) probes that provide continuous and reagentless monitoring. Individually user-replaceable electrodes have a typical lifetime of 18-24 months and are warrantied for 1 year.

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Ammonium and Orthophosphate - The Alyza IQ NH4 and PO4 are online, wet-chemistry analyzers used for continuous monitoring. Alyza provides reliable measurements, simple service and low reagent use, saving you time and money.

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Technology Comparison - ISE vs. Analyzer

dissolved oxygen wastewater sensor

Which is best for your application? Read our blog 'ISE Sensors vs. Wet Chemistry Analyzers for Ammonium Monitoring' which compares online ammonium measurement technology. Learn about the differences between ammonium ISE sensors and online ammonium wet chemistry analyzers.

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UV sensor

NOx, Nitrate, Nitrite, UVT-254, Carbon Parameters (COD, BOD, TOC) - YSI’s full line of UV and UV/VIS sensors are optical-based, reagentless spectrophotometers built into rugged, corrosion-resistant probes that are designed to measure accurately in harsh applications.

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Need help choosing a UV or UV Vis Sensor?

dissolved oxygen wastewater sensor

Access YSI's UV & UV-Vis Sensor Selection Guide to learn more about which parameters can be measured and which sensor is right for your application.

Read our blog 'Top 5 Questions When Selecting a UV or UV-Vis Sensor'. Learn about common UV & UV-Vis sensor applications, the difference between single-wavelength and spectral sensors, maintenance considerations, and more.

turbidity sensor

Sludge Level - The IFL 700 IQ is an ultrasonic, interface level monitoring sensor that provides continuous sludge level data to assist you with operational efficiency improvement decisions. Smart signal filters out interferences like sludge rakes for reliable measurements.

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turbidity sensor

pH and ORP - The Sensolyt provides continuous and reagentless monitoring of pH or ORP using a combination electrode for the most accurate wastewater process monitoring. Sensolyt digital probes can be calibrated in the lab and electrodes are easily replaceable.

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And even more parameters!

Wastewater Monitoring Applications

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IQ SensorNet can help with process optimization,increased efficiency, lower energy use and compliance reporting. Applications include:

  • Dissolved Oxygen monitoring and control
  • Ammonia based aeration control
  • Phosphorus removal chemical dosing
  • Mixed liquor suspended solids monitoring
  • Sludge wasting control
  • Nitrification and denitrification monitoring
  • Biological phosphorus removal monitoring
  • Effluent monitoring
  • Sludge blanket level monitoring
  • Sludge digestion monitoring
  • pH monitoring and control

Remote Access to IQ SensorNet with IQ Web Connect

Remote access is available anytime, anywhere for viewing data and total control of the IQ SensorNet system with IQ Web Connect. IQ Web Connect PC software is included with IQ SensorNet and is free with no monthly fee or contract.

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Let us help you build a system today - Click for a free consultation

Wastewater Monitoring System

Ohio facility improves process and reduces energy costs with IQ SensorNet

Large scale Colorado facility uses IQ SensorNet to improve process efficiency

YSI IQ SensorNet Overview


Additional Resources

wastewater case studies

IQ SensorNet Case
Studies and Solutions

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IQ SensorNet Catalog



wastewater training