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Turbidity

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Turbidity is the measurement of water clarity. Suspended sediments, such as particles of clay, soil and silt, frequently enter the water from disturbed sites and affect water quality. Suspended sediments can contain pollutants such as phosphorus, pesticides, or heavy metals. Suspended particles cut down on the depth of light penetration through the water, hence they increase the turbidity -- or "murkiness" or "cloudiness" -- of the water. High turbidity affects the type of vegetation that grows in water.

Turbid water
Turbid waterTurbid water

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YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI Turbidity products and accessories.

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Have a question about your YSI Turbidity product? Check out the support page with resources compiled just for you.

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Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI Turbidity product.

Product Service

For long-term, in situ continuous monitoring of turbidity, a self-cleaning turbidity sensor is usually necessary to avoid fouling of the sensor and maintain accuracy. YSI measures turbidity with an optical sensor. Light from the emitter enters the sample and scatters off particles in the water. The light, scattered at 90 degrees, enters a detector fiber and is measured by a photodiode. This follows the nephelometric technique of measurement, and values are expressed in nephelometric turbidity units (NTUs).

YSI 6600V2 Comprehensive Monitoring System - View of Sensor Configuration
 

6600V2

Make the most of your environmental monitoring.

 

The 6600 V2 sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP.

 

The YSI 6600EDS showing Turbidity (center) with attached wiper brush, Clockwise from top: Chlorophyll, pH/ORP, Temperature/Conductivity, and Rapid Pulse Dissolved Oxygen Sensors.
 

6600EDS

Extended Deployment for Harsh Environments

 

The 6600EDS multiparameter sonde accurately measures 10 parameters in severe fouling environments for extended periods. The sonde has two optical ports, conductivity/temperature port, Rapid Pulse DO port, and pH/ORP port. The 6600EDS also offers an extended brush that cleans the pH/ORP and Rapid Pulse DO sensors.

 

YSI 6920 V2-2 sensor view showing Temperature/Conductivity, Chloride, pH, as well as Optical DO and Turbidity.
 

6920 V2

Compact Sonde for Unattended Monitoring

 

The YSI 6920 V2 sonde is an economical logging system, ideal for long-term in situ monitoring and profiling. Two versions:

  • 6920 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse Dissolved Oxygen port, pH/ORP port, and 3 ISE ports
  • 6920 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

 

YSI 6820 V2 showing sensors, starting clockwise from top: ROX Optical Dissolved Oxygen, Turbidity, pH, ISE, and temperature/condutivity.
 

6820 V2

Compact Sonde for Field Sampling

 

The YSI 6820 V2 is a cost-effective sonde for profiling and spot-checking in rivers, lakes, wetlands, wells, estuaries, and coastal waters. Two versions are available:

  • 6820 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse DO port, pH/ORP port, and 3 ISE ports
  • 6820 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

 

YSI 600OMS V2 shown with probe guard attached.
 

600OMS V2

Single-Parameter, Low-Cost Optical Monitoring System

 

Measure optical dissolved oxygen, chlorophyll, blue-green algae, rhodamine, or turbidity in combination with temperature, conductivity and depth. Designed for use in fresh, sea or polluted waters, the 600OMS V2 utilizes the field-proven YSI sensors and incorporates innovations in sensor configuration such as a conductivity and temperature module that fits into the sonde body.

 

YSI 600XLM V2 shown without probe guard.
 

600XL V2 and 600XLM V2

Small Packages - Economical Sampling or Logging


Both the YSI 600XL V2 (sampling) and the YSI 600XLM V2 (logging) offer economical solutions in small packages for surface water and ground water applications. Both models easily fit into 2-inch wells and measure a range of fundamental parameters, including oxygen - with the YSI ROX™ optical dissolved oxygen sensor - and level, using a highly-accurate vented sensor.

 

YSI 6920DW showing sensors, clockwise from top: pH/ORP, Temperature/Conductivity, Free Chlorine, Turbidity.
 

6920DW

Monitor Drinking Water in Distribution System

 

The YSI 6920DW is a portable instrument which measures free chlorine, turbidity, and other parameters. Take readings at multiple points along a drinking water distribution system; the collected data gives you a comprehensive view of your water quality and can help you detect events of concern.

 

YSI Buoy-Based Vertical Profiling System
 

Vertical Profilers

For watersheds, source water and reservoir monitoring, YSI Vertical Profiling Systems provide automated data collection and telemetry throughout a water column. These water quality profilers are available in 3 different deployment configurations, each featuring:

  • Rugged, non-corrosive winch and drive mechanism
  • Software for easy set-up, deployment, water quality analysis and export
  • User-selectable sample intervals

 

6136 Optical Turbidity Sensor
 

6136 Turbidity Sensor (6-Series)

Collect accurate, in situ measurement of turbidity in fresh, brackish, and sea water.

 

YSI 6436 Antifouling Optical Turbidity Probe
 

6436 Anti-fouling Optical Turbidity Sensor (6-Series)

Copper-alloy anti-fouling optical turbidity sensor used with 6-Series sondes.

 

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