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

MultiLab 4010-3

Three channel benchtop multiparameter instrument

$1,900.00

EXO2 Multiparameter Sonde

6-port Water Quality Sonde with Anti-fouling Wiper

Request Pricing

IQ SensorNet 2020 XT Controller

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

Request Pricing

2900M Online Monitor & Control System

Two Chemistry Online Monitor & Control System

Request Pricing

ProDSS

Digital Sampling System multiparameter​ handheld provides extreme flexibility. Meter Only.

Request Pricing

5200A Multiparameter Monitoring and Control Instrument

Multiparameter Aquaculture Monitor

Request Pricing

TruLab pH/ISE 1320

Dual channel benchtop pH/ORP/ISE instrument

$1,595.00

ProODO Optical Dissolved Oxygen Instrument

Optical Dissolved Oxygen Digital Handheld Instrument. Meter Only.

$725.00

IQ SensorNet P700 IQ Orthophosphate Analyzer

IQ SensorNet P700 IQ Orthophosphate Analyzer

Request Pricing

2950D Biochemistry Analyzer

Six Chemistry Analyzer

Request Pricing

5500D MultiDO Optical Monitoring and Control Instrument

MultiDO Optical Aquaculture Monitor

Request Pricing

ProOBOD Optical BOD Probe

Self-Stirring Optical BOD Probe for ProODO and ProDSS instruments

$940.00 - $960.00

EcoSense pH100A Meter

pH, mV, Temperature. Instrument Only

$265.00

Professional Plus (Pro Plus) Multiparameter Instrument

Multiparameter Instrument for DO, Conductivity, Salinity, pH, ORP, Ammonium, Nitrate, Chloride, Temperature and more. Meter Only.

$1,220.00

EcoSense ODO200 Handheld

EcoSense Optical Dissolved Oxygen and Temperature Instrument. Instrument Only.

$330.00