GENEQ > Meteorology > Albedometers
| Albedometer |
| Models CMA 11 and CMA 6 |
|
CMA 11 complies with the highest level
of ISO classification, Secondary Standard. CMA 6 complies with the second highest level, First Class. CMA albedometers are constructed around two pyranometer sensors in one convenient housing with an integral mounting rod for attachment to a mast. CMA 6 uses two CMP 6 sensors, CMA 11 is a double CMP 11. |
|
CMA albedometers
are suitable for measuring global radiation and/or albedo over many differing
types of surface. The upper pyranometer measure incoming global solar
radiation and the lower sensor measures solar radiation reflected from
the surface below. From the two measurements the Albedo can be simply
calculated. CMA 6 is recommended for routine meteorological applications, CMA 11 is recommended for scientific applications, for which accuracy needs to be according to the highest standards. The lightweight design makes CMA ideal for portable applications such as on snow and ice fields. The white sun shield prevents the body of the albedometer from heating up. The conical lower glare screen prevents direct illumination of the lower glass dome at sunrise and sunset. A bubble level is fitted and a screw-in drying cartridge keeps the interior free from humidity. The signal cable has a waterproof connector for ease of installation. |
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All albedometers are supplied with a
calibration certificate traceable to the World Radiation Centre. |
| SPECIFICATIONS | ||
| Model | CMA11 |
CMA6 |
| ISO CLASSIFICATION | Secondary
Standard |
First Class |
| Spectral range (50% points) | 310 -- 2800
nm |
310 -- 2800
nm |
| Sensitivity | 7 -- 14 µV/W/m2 |
5 -- 16µV/W/m2 |
| Impedance | 10 -- 100
Ω |
20 -- 200
Ω |
| Response time (95%) | <5 s |
<18 s |
| Non-linearity (0-1000 W/m2) | <0.2 % |
<1 % |
| Tilt error (at 1000 W/m2) | <0.2 % |
<1 % |
| Operating temperature | -40 to +80
ºC |
-40 to +80
ºC |
| Temperature dependence of sensitivity |
<1 % (-10 to +40 ºC) |
<4 % (-10 to +40 ºC) |
| Maximum irradiance | 4000 W/m2 |
2000 W/m2 |
| Directional error (at 80º with 1000 W/m2) |
<10 W/m2 |
<20 W/m2 |
| Weight (inc. rod & cable) | 1.2 kg |
1.2 kg |
| Standard cable length | 10 m |
10 m |
| Optional cable lengths | 25 m and
50 m |
25 m and
50 m |
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