LI-192 Underwater Quantum SensorUnderwater or Atmospheric PPFD Measurement
Underwater PAR MeasurementAccurate measurement of Photosynthetically Active Radiation (PAR, 400-700 nm) in aquatic environments is accomplished using either the LI-192 Underwater Quantum Sensor or the LI-193 Spherical Quantum Sensor. Limnologists, oceanographers and biologists conducting aquatic productivity studies and vertical profiling have used these sensors extensively. For extremely turbid conditions, radiation levels with resolution to 0.01 µmol s-1 m-2 can be measured with the LI-192 or LI-193 quantum sensors and the LI-1400 DataLogger. Both the LI-192 and the LI-193 use computer-tailored filter glass to achieve the desired quantum response. Calibration is traceable to NIST.
Absolute Calibration: ± 5% in air traceable to NIST. Sensitivity: Typically 4 µA per 1000 µmol s-1 m-2 in water. 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 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 800 psi (5500 kPa, 560 meters). Size: 3.18 cm Dia. x 4.62 cm H (1.25” x 1.81”). Weight: 227 g (8 oz.). Mounting: Three 6-32 holes are tapped into the base for use with the 2009S Lowering Frame or other mounting devices. Cable: Requires 2222UWB Underwater Cable. Underwater Sensors can be purchased with several accessories. Please see Accessories Page for details. The LI-192SA must be used in combination with a 2222UWB Underwater Cable. This combination can be directly connected to the LI-250A Light Meter or LI-1400 Data Logger. The 2291 Millivolt Adapter should be ordered if the LI-192SA will be used with a data acquisition device or data logger that measures millivolts. The 2291 uses a 1210 Ohm precision resistor to convert the LI-192SA output from microamps to millivolts. LI-192SA Underwater Quantum Sensor 2009S Lowering Frame 2291 Millivolt Adapter 2222UWB-3 Underwater Cable, 3 meters 2222UWB-10 Underwater Cable, 10 meters 2222UWB-30 Underwater Cable, 30 meters 2222UWB-50 Underwater Cable, 50 meters 2222UWB-100 Underwater Cable, 100 meters 100L Lubricant
Additional literature related to the LI-192 is also available:
If you have any questions about the LI-192 please feel free to contact us and discuss with our Applications Analysts and Scientists (or your local LI-COR Distributor) how the LI-192 can help you with your research. Selected Links
Please submit your published papers or links to your websites to be featured here by contacting the Product Manager, Mr. Brent Claassen. Journal ReferencesUse the academic search engines below to find references to the LI-192 in many peer reviewed scientific publications. For best results, start with the search terms provided below or use the forms to customize a search. Results open in a new window. References from HighWire Press - Internet Imprint of the Stanford University Libraries
References from Google Scholar™Common Internet searches can be performed with Google, and many articles can be found with Google Scholar: The LI-192 includes a printed copy of the Instruction Manual. You can download future updates of the LI-192 manual on this page.
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Underwater
or atmospheric Photosynthetic Photon Flux Density (PPFD)
can be accurately measured using the LI-192 Underwater
Quantum Sensor. The LI-192 is cosine corrected and features
corrosion resistant, rugged construction for use in freshwater
or saltwater and pressures up to 800 psi (5500 kPa, 560
meters depth).
