LiCor 193SA

Description

The LI-193SA Spherical Underwater Quantum Sensor is used for measuring PAR (photosynthetically active radiation) in aquatic environments, and specifically PPFFR (photosynthetic photon flux fluence rate). The LI-193SA gives an added dimension to underwater PAR measurements in that it measures photon flux from all directions (PPFFR). This is important, for example when studying phytoplankton which utilize radiation from all directions for photosynthesis

Principal of measurement and Specifications

The LI-193SA features a high sensitivity optical design and compact, rugged construction (500 psi) for use in harsh aquatic environments. Please note that because of the nature of the measurement this sensor is making that it is not cosine corrected as are all of the other LI-COR quantum sensors.

Specifications
Absolute Calibration: ± 5% in air traceable to NBS
Sensitivity: Typically 3 µA per 1000 µmol s-1 m-2
Linearity: Maximum deviation of 1% up to 10,000 mmol 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: Acrylic diffuser Angular Response: <± 4% error up to ± 90° from normal axis
Azimuth: <± 3% error over 360° at 90° from normal axis
Detector: High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing: Corrosion resistant metal for both saltwater and freshwater applications with an injection molded, impact resistant, acrylic diffuser. Units have been tested to 500 psi (34 bars) with no failures
Globe Size: 6.1 cm diameter (2.4")
Housing Size: 3.18 cm diameter (1.25")
Overall Height: 10.7 cm (4.2")
Weight: 142 g (0.31 lb.)
Cable: Requires 2222UWB Underwater Cable