Photosynthetic Active Radiation (PAR)

Photosynthetic Active Radiation (PAR) is irradiance—or the amount of sunlight or ambient light that diffuses through water compared to surface light. PAR focuses on the dynamics of the photic zone, typically 1-5 meters below the surface, and leads to an understanding of photosynthesis, toxic algae blooms, and eutrophication (nutrient loading).

Scientists studying phytoplankton and photosynthesis and measuring chlorophyll need to measure PAR in order to resolve the absorption rate. High levels of PAR can indicate photoinhibition (limiting photosynthesis in shallow waters), which affects submerged aquatic vegetation and certain aquatic species.

YSI measures PAR using a single or dual Li-Cor® sensor attached to a YSI 6600 water quality sonde for continuous field monitoring. For more information on using PAR with a 6600, visit YSI Integrated Systems & Services.

PAR Deployment

Featured Products

EXO2 Multiparameter Sonde

7-Port Multiparameter Water Quality Sonde

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IQ SensorNet 2020 3G Controller

Modular water quality system for a complete sensor network allows for connection of 20 sensors

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2900M Online Monitor & Control System

Two Chemistry Online Monitor & Control System

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HYCAT

Autonomous Surface Vehicle

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MultiLab 4010-3W

Three channel benchtop multiparameter instrument with wireless capability

$1,920.00

Amazon Bubbler

Self-contained Continuous Flow Bubbler with Fully Integrated Pressure Sensor

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EXO GO

Monitoring Made Mobile

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IQ SensorNet Alyza Analyzer PO4

IQ SensorNet Orthophosphate Analyzer

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ProSolo Digital Water Quality Meter

Optical Dissolved Oxygen, Conductivity, and Salinity Digital Handheld Instrument. Meter Only.

$850.00

Pro10 pH or ORP Instrument

pH or mV (ORP) and Temperature Handheld Instrument. Meter Only.

$517.00

Pro1020 Dissolved Oxygen and pH or ORP Instrument

Dissolved Oxygen, pH/mV and Temperature Handheld Instrument. Meter Only.

$795.00

EXO1S Customized Multiparameter Sonde

EXO1S Multiparameter Water Quality Sonde Batteryless Conversion Service (7 sensor ports including a central wiper port)

$2,385.00 - $3,100.00