Campbell Scientific Solar1000 Station - Manual (Page 40)

6. LP02 Pyranometer
6.1. General Description
This manual provides information for interfacing Hukseflux’s LP02
Pyranometer to various models of Campbell Scientific dataloggers.
The LP02 is shipped with an instruction manual provided by Hukseflux that
contains information concerning the LP02’s construction, spectral sensitivity,
cosine response, and a simple sensor check out procedure. Included with the
sensor and manual is a calibration certificate with the sensor calibration
constant and serial number. Cross check this serial number against the serial
number on your LP02 to ensure that the given calibration constant corresponds
to your sensor.
The LP02 pyranometer is designed for continuous outdoor use. Due to its flat
spectral sensitivity from 300 to 3000 nm, it can be used in natural sunlight,
under plant canopies, in green houses or buildings, and inverted to measure
reflected solar radiation. Two LP02s can be used in combination to measure
albedo. The LP02 can also be used to measure most types of artificial light
(Xenon lamps, Halogen lamps, etc.).
The LP02 pyranometer consists of a thermopile sensor, housing, dome, and
cable. The thermopile is coated with a black absorbent coating. The paint
absorbs the radiation and converts it to heat. The resultant temperature
difference is converted to a voltage by the copper-constantan thermopile. The
thermopile is encapsulated in the housing in such a way that it has a field of
view of 180 degrees and the angular characteristics needed to fulfill the cosine
response requirements.
6.2. Specifications
The LP02 complies with the ISO Second class pyranometer specifications as
detailed below.
LP02 ISO / WMO Specifications 1
Overall classification according to ISO
9060 / WMO
Second class pyranometer
Response time for 95 % response 18 s
Zero offset (response to 200 W/m 2 net
thermal radiation)
< 15 W/m 2
Zero offset (response to 5 k/h change in
ambient temperature)
<4 W/m 2
Non-stability < 1% change per year
Non-Linearity < +/- 2.5%
Directional response for beam radiation: within +/- 25 W/m 2
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