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PYRANOMETER
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The
Solar Radiation Sensor, or solar pyranometer, measures global radiation, the
sum at the point of measurement of both the direct and diffuse components of
solar irradiance. The sensor’s transducer, which converts incident radiation
to electrical current, is a silicon photodiode with wide spectral response.
From the sensor’s output voltage, the console calculates and displays solar
irradiance. It also integrates the irradiance values and displays total
incident energy over a set period of time. |
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The outer
shell shields the sensor body from thermal radiation and provides an airflow
path for convection cooling of the body, minimizing heating of the sensor
interior. It includes a cut-off ring for cosine response, a level indicator,
and fins to aid in aligning the sensor with the sun’s rays. The space
between the shield and the body also provides a run-off path for water,
greatly reducing the possibility of rain- or irrigation-water entrapment.
The diffuser is welded to the body for a weather-tight seal; it provides an
excellent cosine response. The transducer is an hermetically-sealed silicon
photodiode; the included amplifier converts the transducer current into 0 to
+2.5 VDC. Spring-loaded mounting screws, in conjunction with the level
indicator, enable rapid and accurate levelling of the sensor. |
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Each sensor
is calibrated against a secondary standard which is calibrated periodically
against an Eppley Precision Spectral Pyranometer in natural daylight. |
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SPECIFICATIONS |
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General |
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Operating
Temperature.
. . . . . . . . . . . . . . . . . . . . . . . .
. .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
-40° to
150° F (-40° to 65° C) |
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Sensor Type.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Silicon
photodiode |
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Spectral
Range(10%
points). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
400 to 1100
nanometers |
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Cosine
Response |
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Percent of
Reading . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . ±3%
(0° to ±70° incident angle); ±10% (±70° to ±85° incident angle) |
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Percent of
Full Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±2% (0° to
±90°) |
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Attached
Cable Length.
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 40'(12 m) |
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Cable Type.
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. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-conductor,
26 AWG |
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Connector.
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. . . . . . . . . . . . . . . . . . . . . . . . . .
Modular
connector (RJ-11) |
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Recommended
Maximum Cable Length.
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
125'(38 m) |
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Housing
Material.
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UV-resistant plastic |
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Dimensions.
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. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . 2'
x 2.75' x 2.25'(51 mm x 70 mm x 57 mm) |
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Weight.
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. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .
12 oz. (340
g) |
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Console
Data
(These
specifications apply to sensor output as converted by Davis Instruments
weather station consoles.) |
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Range |
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Solar
Radiation Intensity . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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0 to 1500
W/m2 |
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Solar
Energy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0
to 1999.9 Langleys |
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Accuracy |
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Solar
Global Radiation Intensity . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . ±5% |
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Solar Energy. . . . . . . .
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. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ±5% |
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Resolution |
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Solar
Radiation Intensity . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . .
1 W/m2 |
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Solar
Energy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 0.1
Langleys |
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Sample and
Display Update Interval |
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Solar
Radiation Intensity . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . .
. . . . . . . . . . .
12
seconds (6 seconds when selected for display) |
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Solar
Energy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
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. . . . . . .
1
minute |
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WeatherLink |
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Data
(These
specifications apply to sensor output as logged and displayed by the
WeatherLink.) |
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Solar
Radiation Intensity.
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Average over archive interval |
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Solar
Energy.
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Sum over
archive interval in Langleys; sum over archive interval in Joules/cm2
(range: 0 to 1999.9; resolution: 0.1 J/cm2) using Energy WeatherLink |
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Input/Output
(These specifications apply to the sensor as a separately-sold item.) |
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Connections
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Yellow . .
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Output (0 to +3VDC); 1.67 mV per W/m2 |
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Red &
Green. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Ground |
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Black. . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+5V DC ±10%; 3mA (typical) |
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Temperature Coefficient.
. . . . . . . . . .
. . . . . . -0.034%
per degree F (- 0.063%per degree C);Reference temperature = 72°F (22°C) |
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PYRANOMETER |
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COSINE
RESPONSE (TYPICAL) |
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CONNECTIONS |
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