CMP6 Albedometer Kit

  • ISO 9060:1990 First Class Albedometer Kit
  • Based on two CMP6 pyranometers

 

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CMP6 Albedometer Kit

This ISO 9060:1990 First Class albedometer kit is ideal to define the ratio of irradiance reflected to the irradiance received by a surface (albedo). This results in a scale from 0 (no reflection) to 1 (total reflection)

By using two separate pyranometers with a mounting fixture (plate and rod) and glare screen for the lower pyranometer there is a choice of configurations available.
The CMB1 mounting bracket can be used to fix the rod to a pole or wall. 
If the CMF1 mounting fixture is replaced by the CMF4 model, the CVF4 ventilation unit can be used with the upper and/or lower pyranometers , but when a lower ventilation unit is used, the glare screen cannot be fitted.
For the lower CVF4 a special glare screen is available.

Its good quality and cost-effectiveness make the CMP6 albedometer kit ideal for meteorology, hydrology and agricultural applications.

 

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Specifications

Spectral range (50% points) 285 to 2800 nm
Sensitivity 5 to 20 µV/W/m²
Maximum operational irradiance 2000 W/m2
Response time (95%) < 18 s
Spectral range (50% points) 285 to 2800 nm
Zero offset A < 10 W/m²
Zero offset B < 4 W/m²
Temperature dependence of sensitivity (-10 ºC to +40 ºC) < 4 %
Field of view upper 180, lower 170 °
Operational temperature range -40 °C to +80 °C

FAQ

  • Can I use a pyranometer under water?
    • The CMP series can also be used under water, the depth is limited to 1 meter and can only be used for short measurements.

      It is advisable not to keep the Pyranometer of the CMP series under water for longer than 30 minutes.

      The SP Lite2 pyranometer and the PQS 1 PAR Quantum Sensor can be used for a longer period under water, the depth is limited to 2 meters. Please also take  “breaking of light on the water surface” in consideration.

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  • Negative output during nighttime measurements?
    • This error is related to the zero offset type A. Normally this zero offset is present when the inner dome has a different temperature from the cold junctions of the sensor. Practically this is always the case when there is a clear sky. Because of the low effective sky temperature (<0 °C) the earth surface emits roughly 100 W/m2 longwave infrared radiation upwards. The outer glass dome of a pyranometer also has this emission and is cooling down several degrees below air temperature (the emissivity of glass for the particular wavelength region is nearly 1). The emitted heat is attracted from the body (by conduction in the dome), from the air (by wind) and from the inner dome (through infrared radiation). The inner dome is cooling down too and will attract heat from the body by conduction and from the sensor by the net infrared radiation. The latter heat flow is opposite to the heat flow from absorbed solar radiation and causes the well known zero depression at night. This negative zero offset is also present on a clear day, however, hidden in the solar radiation signal.

      Zero offset type A can be checked by placing a light and IR reflecting cap over the pyranometer. The response to solar radiation will decay
      with a time constant (1/e) of 1 s, but the dome temperature will go to equilibrium with a time constant of several minutes. So after half a minute the remaining signal represents mainly zero offset type A.

      Good ventilation of domes and body is the solution to reducing zero offsets even further. Kipp & Zonen advises the CVF 3 Ventilattion Unit for optimal ventilation and suppression of zero offset type A. Using the CVF 3 zero offset type A will be less than 3 W/m2.

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