Description

The LI-192SA Underwater Quantum Sensor is used for measuring PAR (photosynthetically active radiation) in aquatic environments. With its 400-700 nm quantum response it is a valuable tool for researching primary productivity or other projects of environmental concern. The sensor can be used in the air with accuracy similar to that of the LI-190SA

Prior to obtaining atmospheric readings, the sensor must be dried. Underwater or atmospheric PPFD is accurately measured using the LI-192SA. The LI-192SA is cosine corrected and features corrosion resistant, rugged construction for use in saltwater and pressures up to 800 psi. An LI-190SA is frequently used as a reference sensor to measure surface PPFD for rapid comparison with a submerged LI-192SA. These comparisons, which are used in vertical profiling studies, or are needed under changing radiation conditions due to waves or atmospheric conditions, can easily be accomplished by connecting these sensors to the LI-1000 Datalogger.

Specifications
Absoute Calibration: ± 5% in air traceable to NBS
Sensitivity: Typically 3 µA per 1000 ±mol s-1 m-2
Linearity: Maximum deviation of 1% up to 10,000 µmol s-1 m-2
Stability: <± 2% change over a 1 year period
Response Time: 10 µS
Temperature Dependence: ± 0.15% per °C maximum
Cosine Correction: Optimized for both underwater and atmospheric use
Azimuth: <± 1% error over 360° at 45° elevation
Detector: High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing: Corrosion resistant metal with acrylic diffuser for both saltwater and freshwater applications.
Waterproof to withstand 800psi (54 bars)
Size: 3.18 diameter x 4.62 cm H (1.25 diameter x 1.81" H)
Weight: 227g (0.50 lb)
Cable: Requires 2222UWB Underwater Cable