Apogee SP-110 Benutzerhandbuch - Seite 2
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Pyranometer
This sensor is a silicon-cell pyranometer.
It
is
calibrated
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
-2
-1
m
s
or Watts m
Mounting the Sensor
Bolt: 10-32x5/8
Model AL-100
Orientation
to
measure
-2
2
Each sensor is equipped
with
a
mounting
Mount
the
sensor
level as possible.
changes in level can cause
measurement errors.
recommend
using
leveling plate
(model AL-100)
for
the
most
measurements. The sensor
should be mounted with the
cable pointing toward the
nearest magnetic pole to
minimize azimuth error.
S
N N
N
4
Cosine Response
total
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.
Sensors have a
standard calibration of exactly:
bolt.
as
Small
We
Full Sunlight
our
(1100 W m
accurate
solar radiation =
SP-110
7
Calibration
5.00 W m
-2
)
Use the conversion factor
-2
(5.00 W m
per mV) to convert
the mV signal from the sensor
to shortwave radiation in Watts
-2
m
(multiply the mV output by
the conversion factor to yield
shortwave radiation in W m
Sensor Output
(220 mV)
=
5
-2
per mV
-2
).