About This Instrument

<p>Light Meter displays measurements from LI-COR radiation sensors. The LI-250A provides high-resolution reading and conversion of microamp signals from the attached light sensor into suitable light measurement units.</p> <p>A quantum sensor measures photosynthetically active radiation (µmol s -1 m-2 of PAR), a pyranometer measures solar radiation (W m-2 ), and a photometric sensor measures illuminance (lux).</p>

Functioning well

Light meter LI-250A

Rajarata University of Sri Lanka

Faculty Agriculture
Department Agricultural Systems
Laboratory Agroecology Laboratory
Category Light meter

Service Charge Contact Institute

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Manufacturer	LI-COR
Model	LI-250A
Manufactured Year	0000
HS Code	—
Instrument Condition	Functioning well
Instrument Price (Rs)	545900.00
Funding Source	HETC/QIG
External Research Support	Yes
Availability of Technical Staff	Yes
Commencement of Operations	2014-07-21
Vendor Name	Islandwide Scientific (pvt) Ltd
Vendor Contact	+94112681150
Vendor URL	—
Catalog Access	—
Catalog Upload	—
Catalog Link	https://www.licor.com/env/products/light/light_meter
Stage of the Record	Incomplete

Product Category	Light meter
Sub Category	—
Testing Parameters	Photosynthetically Active Radiation (µmol s -1 m-2 of PAR), Solar Radiation (W m-2 ), Illuminance (lux)
Description	Light measurements can be obtain using radiation sensors. The quantum sensor measures Photosynthetically Active Radiation (µmol s -1 m-2 of PAR), The Pyranometer measures solar radiation (W m-2), and the photometric sensor measures illuminance (lux)
Relevant Instruments	Light meter, Radiation sensors (quantum sensor, Pyranometer, photometric sensor)

Technical Specification	<ul> <li><strong>Accuracy:</strong> <ul> <li><strong>25 °C:</strong> Typically ± 0.4% of reading ± 3 counts on the least significant digit displayed (all ranges).</li> <li><strong>0 - 55 °C:</strong> Typically ± 0.6% of reading ± 3 counts on the least significant digit displayed (all ranges).</li> </ul> </li> <li><strong>Range Selection:</strong> Autoranging (3 ranges).</li> <li><strong>Linearity:</strong> ± 0.05%.</li> <li><strong>Sensors:</strong> Designed for type "SA" sensors; type "SB" and "SL" sensors with BNC connectors are also compatible when calconnector or millivolt adapter are removed.</li> <li><strong>Sensor Calibration:</strong> Each sensor is supplied with a calibration multiplier. Calibration multipliers for two sensors can be stored in memory. Calibration multipliers are entered from the keypad.</li> <li><strong>Signal Averaging:</strong> Sensor output can be collected and displayed as a 15-second average (approximately 60 readings). Averages are retained on the display in HOLD mode.</li> <li><strong>Display:</strong> LCD display. Updated every 0.5 seconds in Instantaneous mode.</li> <li><strong>Battery Life:</strong> 150 hours typical with continuous operation.</li> <li><strong>Power Requirement:</strong> One 9V Alkaline battery.</li> <li><strong>Operating Conditions:</strong> 0 to 55 °C, 0 to 95% RH (non-condensing).</li> <li><strong>Storage Conditions:</strong> -55 to 60 °C, 0 to 95% RH (non-condensing).</li> <li><strong>Size:</strong> 14 cm × 7.7 cm × 3.8 cm (5.5" × 3" x1.5").</li> <li><strong>Weight:</strong> 0.26 kg (0.57 lbs).</li> </ul> <p> </p> <table> <thead> <tr> <th>Sensor</th> <th>Range</th> <th>Resolution</th> </tr> </thead> <tbody> <tr> <th scope="row">Quantum</th> <td>0-199 µmol s-1 m-2<br /> 0-1999<br /> 0-19999</td> <td>0.01 µmol s-1 m-2<br /> 0.1<br /> 1</td> </tr> <tr> <th scope="row">Pyranometer</th> <td>0-19 W m-2<br /> 0-199<br /> 0-1999</td> <td>0.001 W m-2<br /> 0.01<br /> 0.1</td> </tr> <tr> <th scope="row">Photometric</th> <td>0-1999 lux<br /> 0-19999 lux<br /> 0-199 klux</td> <td>0.1 lux<br /> 1<br /> 0.01 klux</td> </tr> </tbody> </table>
Number of Samples per Cycle	0
Number of Samples per Day	0
Total Usage Hours per Day	0