YSI EXO Total Algae Sensor

YSI EXO Total Algae Sensor


The YSI EXO total algae sensor is a digital smart sensor featuring welded titanium construction and wet-mateable connectors.


  • Dual channel sensor
  • Measures and outputs both chlorophyll & blue-green algae
  • Options for ug/L and RFU outputs
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Usually ships in 3-5 days
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Image Part # Product Description Price Stock Order
YSI EXO Total Algae Sensor 599102-01 EXO freshwater total algae sensor (chlorophyll & phycocyanin) Usually ships in 3-5 days
YSI EXO Total Algae Sensor 599103-01 EXO saltwater total algae sensor (chlorophyll & phycoerythrin)
Usually ships in 3-5 days
Image Part # Product Description Price Stock Order
Bright Dyes Rhodamine WT Dye 106023-01P FWT 25 Rhodamine WT dye, 2.5% active ingredient, 1 pint
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YSI EXO Total Algae Sensor Reviews

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Questions & Answers

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How does the total algae sensor read both chlorophyll and phycocyanin algae?
The EXO total algae sensor has two excitation beams. The first one (470 nm) directly excites the chlorophyll a molecule while the second one (590 nm) excites the phycocyanin accessory pigment found in blue-green algae. The sensor generates and outputs two independent data sets.
What is a benefit of the total algae sensor?
The total algae sensor is two sensors in one, which gives you more space for other parameters. It is also less sensitive to common interferences, has a faster response time, and a deeper depth rating.
What is the depth rating for my EXO Total Algae Sensor?
The depth range is 250m for the EXO total algae sensor.
How long will my base solution last?
A base solution (the first dilution) will last a couple of months. The second dilution should only be used for a couple of days.

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Indiana Department of Environmental Management officials are starting their statewide algae inspections, according to an article from Indiana Public Media. During the next two weeks, state officials plan to measure algae concentrations in 13 state parks. Indiana environmental officials collect water samples in each lake in the park. They test the samples for blue-green algae.  If they find concentrations of algae greater than 100 million cells per liter, the lake will be closed to recreation for a minimum of two weeks.

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Total algae sensor is the newest addition to YSI's EXO sondes

Many algae sensors can detect Chlorophyll a or levels of blue-green algae. YSI’s new Total Algae Sensor can measure both at the same time. “If you’re only looking at Chlorophyll a, you can miss a very big portion of total algae biomass,” said Tim Finegan, product manager. The new sensor is an optional attachment to the company’s line of EXO sondes, which debuted earlier this year . It’s an optical probe and maintenance is limited to keeping the sapphire windows on the unit clean. The Total Algae Sensor can be calibrated in two different ways, one for spot sampling and one for continuous sampling, which allows users to make sure readings are accurate for their specific monitoring applications.

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The new YSI EXO Sonde expands monitoring capabilities for users compared to YSI’s the previous generation of sondes. One new feature for the EXO is a fluorescent dissolved organic matter probe that measures light-absorbing particles in water. The sensor is another attempt by YSI to provide instrumentation options to those in the waste water industry, or anyone interested in measuring dissolved organic matter alongside other parameters. YSI’s fDOM sensor detects only on a narrow wavelength range.  “The wavelength at which (particles) absorb light optimally and then the wavelength that they emit, or fluoresce light optimally, is unique to that molecule,” said Rob Ellison, YSI EXO director of research and development, during a webinar on the fDOM sensor .

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