Apogee SP-110 User manual

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63
Never attach a power source
to the sensor
Precision
Pyranometer
Owners Manual
Model: SP-110
Specifications
Attach the sensor to a meter or datalogger
capable of displaying or recording a mV output.
The model, serial number, production date, and
conversion factor are located on the sensor cable.
Red: positive (signal
from sensor)
Black: negative
(signal from sensor)
Clear: shield/ground
Setup Instructions
Spectral Response and Calibration
An ideal pyranometer measures the entire solar
spectrum, 280 to 2800 nm. However, about 90% of
sunlight energy is between 300 to 1100 nm. Model
SP-110 is calibrated to estimate all of the shortwave
energy from sunlight. Apogee pyranometers are
calibrated under sunlight over amultiple day period
to a heated and ventilated Kipp & Zonen model CM21
precision reference radiometer.
US Patent No. D519,860
435-792-4700
www.apogeeinstruments.com
[email protected]
Precision
Cosine response 45° zenith angle ± 1 %
75° zenith angle ± 4 %
Absolute accuracy ± 5 %
Uniformity ± 3 %
Repeatability ± 1 %
Output Responsivity 0.200 mV per W m-2
In full sunlight 220 mV (1,100 W m-2)
Linear range 0 - 350 mV (0 - 1,750 W m-2); 1.75 x full sun
Sensitivity Custom calibrated to exactly 5.00 W m-2 per mV
Input power None, self-powered
Operating environment - 40 to 55 °C; 0 to 100% relative humidity.
Designed for continuous outdoor use. Can be
submerged under water.
Materials Anodized aluminum with acrylic lens
Cable 3 meters of shielded, twisted-pair wire with
Santoprene casing, ending in pigtail leads.
Additional cable $1.95/meter.
Dimensions 2.4 cm diameter, 2.75 cm high
Mass 70 g (with 3 m lead wire)
Warranty 1 year against defects in materials/workmanship
SP-110 3857
29 FEB 2008
5.00

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Temperature response
The temperature response is less than 0.1% per degree Celsius.
This temperature error is not significant in most applications.
Long-term stability
Our research indicates that the average output increases about
1% per year because of changes in the optical transparency of the
diffusion disk. We recommend returning the sensor for recalibration
every 2 years.
Each sensor is equipped
with a mounting bolt.
Mount the sensor as
level as possible. Small
changes in level can cause
measurement errors. We
recommend using our
leveling plate (model AL-100)
for the most accurate
measurements. The sensor
should be mounted with the
cable pointing toward the
nearest magnetic pole to
minimize azimuth error.
N
S
N
N
Model AL-100
Cosine Response
Full Sunlight
(1100 W m-2)
Sensor Output
(220 mV)
solar radiation = SENSOROUTPUTXCONVERSIONFACTOR
=M6X 7 PERM6 7
Use the conversion factor
(5.00 W m-2 per mV) to convert
the mV signal from the sensor
to shortwave radiation in Watts
m-2 (multiply the mV output by
the conversion factor to yield
shortwave radiation in W m-2).
Calibration
Sensors have a
standard calibration of exactly:
5.00 W m-2 per mV
Bolt: 10-32x5/8
Mounting the Sensor
Orientation
SP-110
This sensor is a silicon-cell pyranometer.
It is calibrated to measure total
shortwave radiation. The evaporation of
water from saoil and the transpiration of
water from plant leaves are partly
determined by the intensity of shortwave
radiation, which is measured in Joules
m-2 s-1 or Watts m-2
Pyranometer