YSI offers several PAR systems that can be directly integrated into existing or new 6600 multiparameter sondes. PAR sensors are powered by the sonde and PAR data is added to the data stream of the water quality sonde.
PAR measurements are important because the rate of photosynthesis directly relates to the penetration of light throughout the water column. Also, high levels of PAR can indicate photoinhibition. PAR levels vary due to the natural attenuation by water and the presence of absorbing algal pigments, dissolved organic material, and scattering by particles.YSI measures PAR using a single or dual Li-Cor sensor attached to a YSI 6600 water quality sonde for continuous field monitoring.
YSI offers several PAR systems that can be directly integrated into existing or new 6600 multiparameter sondes. PAR sensors are powered by the sonde and PAR data is added to the data stream of the water quality sonde. This eliminates a separate data logger for PAR and enables long-term studies without requiring a surface data logger.
Choose between single or dual, wiped or unwiped LI-COR 2π PAR sensors or a single unwiped LI-COR 4π PAR sensor. Use PAR sensors for:
Specification | |
---|---|
Maximum Operating Depth | 100 ft |
Compatibility | New or existing YSI 6600* series sondes |
Measurements | Averaged over a 60-second time period, filter time user-adjustable |
Units | Millivolts or μmoles/sec/m2 |
Absolute calibration | ±5% |
Sensitivity | Typically 3 μA per 1000 μmol s-1 m-2 in water |
Linearity | Maximum deviation of 1% |
Stability | <±2% change over one-year period |
Response time | 10 μs |
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