Photosynthetically Active Radiation (PAR) Sensor

The T-Chain can be designed to include a PAR sensor that measures Photosynthetic Photon Flux Density (PPFD). PME uses Li-Cor's LI-192SA Underwater Quantum Sensor. The sensor has been modified to allow easy connection to the T-Chain. For use in freshwater and saltwater.

Specifications

Absolute Calibration: ± 5% in air traceable to NBS.

Sensitivity: Typically 4 μA per 1000 μmol s¯¹m¯² in water.

Linearity: Maximum deviation of 1% up to 10,000 μmol s¯¹m¯².

Stability: < ± 2% change over a 1 year period.

Response Time: 10 μs.

Temperature Dependence: ± 0.15% per ºC maximum.

Cosine Correction: Optimized for both underwater and atmospheric use.

Azimuth: < ± 1% error over 360º at 45º elevation.

Detector: High stability silicon photovoltaic detector (blue enhanced).