Vaisala PTB210 SERIES Manuel d'instructions Page 105

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20 CONTENTS
1.2.5 Solar Radiation
Kipp & Zonen CMP3
User Information
Measurements with the BGC-FTIR-System are only possible when the sun is
visible. Therefor the Pyranometer CMP 3 comes into operation. The ther-
mopile sensor construction measures the solar energy that is received from the
total solar spectrum and the whole hemisphere (180 degrees field of view). The
output is expressed in W/m
2
according to equation (1.1).
E
solar
=
U
emf
S
(1.1)
•E
solar
= Irradiance [W/m
2
]
•U
emf
= Output Voltage [V]
S = Sensitivity [V/(W/m
2
)]
Figure 1.14: Kipp & Zonen CMP3
The CMP 3 is intended for shortwave global solar radiation measurements
(spectral range 310 to 2800 nm) and measures irradiance up to 2000 W/m
2
with a response time < 18 seconds.
Maintenance
Dust and dirt may collect on the glass dome. This, however, is usually washed
off by the precipitation, but can disturbe the measurements if not. The glass
dome of the sensor should be checked and cleaned with water or alcohol on
every maintenance day. Also check the level of the sensor and adjust with its
set screws if required. The sensor should be recalibrated every two years.
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