Apogee Pyranometer SP-110 – Solar Radiation Sensor

The Apogee SP-110 Pyranometer measures the total solar global irradiance: a measure of the rate of total incoming solar energy (both direct and diffuse) on a horizontal plane at the Earth’s surface.

Typically connected to a data logger, the SP-110 is in a wide variety of climates, ranging from the Himalayas in Nepal to the Australian outback.

Calibration factor

The pyranometer can be used to find the instantaneous value of the solar irradiance in W/m2 or by integration to find the total energy per square meter which strikes the instrument during a given period. The calibration factor K can be expressed as follows: K = 200 mV/(kW/m²)

This value means that when the solar irradiance equals 1 kW/m² (typical for a clear, sunny day around noon), then
the pyranometer output voltage will be about 200 mV. If the output voltage for example is 100 mV, then the solar
irradiance would be about 0,5 kW/m² = 500W/m².

In other words:

S[kW/m2] = U[mV]/K

where U is the signal voltage in millivolts, and S is measured in kW/m².

Cable connections

The SP-110 is supplied with a 4.8 meter cable with a waterproof connection to the instrument. The electrical connections to the cable are as follows:

• red: signal plus (0-250 mV)

• black: signal ground

• white: cable shield (ground)

Specifications

Power Supply:    Self powered
Sensitivity:    0.20 mV per W m-2
Calibration Factor: 5.0 W m-2 per mV (reciprocal of sensitivity)
Calibration Uncertainty:    ± 5 %
Measurement Repeatability:    < 1 %
Non-stability (Long-term Drift):    < 2 % per year
Non-linearity:    < 1 % (up to 1750 W m-2)
Response Time:    < 1 ms
Field of View:    180°
Spectral Range:    360 nm to 1120 nm (wavelengths where response is 10 % of maximum)
Directional (Cosine) Response:    ± 5 % at 75° zenith angle
Temperature Response:    -0.04 ± 0.04 % per C
Operating Environment:    -40 to 70 C, 0 to 100 % relative humidity
Dimensions:    2.40 cm diameter and 2.75 cm height
Mass:    90 g (with 5 m of lead wire)
Warranty:    4 years

Downloads

For more inforamtion on this product, please download the Apogee SP-110 Pyranometer brochure