LI200X-L

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Technical Description

The LI200X uses a silicon photovoltaic detector mounted in a cosine-corrected head to provide solar radiation measurements. Calibrated against an Eppley precision spectral pyranometer (PSP), the LI200X accurately measures sun plus sky radiation for the spectral range of 400 to 1100 nm. Sensors calibrated to this spectral range should not be used under vegetation or artificial lights.

The LI200X includes an epoxy-encased completion circuit in its cable. This completion circuit standardizes the sensor's sensor's calibration, allowing individual sensors to be interchanged without altering multiplier and offset values.

LI200X-L Specifications

Light Spectrum Waveband: 400 to 1100 nm
Accuracy: Absolute error in natural daylight is ±5% maximum; ±3% typical
Sensitivity: 0.2 kW m^-2 mV^-1
Linearity: Maximum deviation of 1% up to 3000 W m^-2
Shunt Resistor:
Adjustable, 40.2 to 90.2 ohm,
factory set to the above sensitivity
Stability: < ±2% change over a 1 year period
Response Time: 10 μs
Temperature Dependence: 0.15% per °C maximum
Cosine Correction: Cosine corrected up to 80° angle of incidence
Operating Temperature: -40° to +65°C; the overmolding that protects the completion circuit in the cable may crack if the temperature drops below -40°C
Relative Humidity: 0 to 100%
Detector: High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing: Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware
Diameter: 2.38 cm (0.94 in.)
Height: 2.54 cm (1.00 in.)
Weight: 28 g (1 oz)