METER ATMOS 41 - 3.2 PYRANOMETER

12
SYSTEM
Power Up Time (SDI ready)—Other Commands
Minimum NA
Typical 800 ms
Maximum NA
Measurement Duration
Minimum NA
Typical 110 ms
Maximum 3,000 ms
COMPLIANCE
Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
3.2 PYRANOMETER
Solar radiation is measured by a pyranometer that is integrated into the lip of the rain gauge
funnel at the top of the ATMOS 41. Designed, manufactured, and calibrated by experts at
Apogee Instruments, the miniature pyranometer uses a silicon-cell sensor to measure the
total incoming (direct and diffuse) solar radiation. A carefully developed cosine-correcting
head ensures accurate readings regardless of sun angle, while the painstakingly researched
optical filter material balances cost and performance to ensure the silicon-cell provides
good accuracy regardless of temperature or sensor age. Silicon-cell sensors have excellent
response time to changing radiation conditions and acceptable sensitivity across the solar
spectrum (Figure6), which make them perfect for use on the ATMOS 41.
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
300 400 500 600 700 800 900 1000 1100 1200
Figure6 Spectral response estimate of Apogee silicon-cell pyranometers