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CMP6-L 短波辐射表
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概览

CMP6为ISO一级短波辐射表，用于监测全太阳波段的太阳辐射。可直接接入到Campbell Scientific数据采集器，通常用于环境监测、太阳能资源评估及太阳能电厂性能应用中。

优势与特点

  • Double glass dome and increased thermal mass improve performance, allowing it to have an ISO first-class classification
  • Compatible with most Campbell Scientific data loggers
  • Integrated bubble level is visible without removing sun shield
  • Desiccant-filled drying cartridge prevents dew from forming on the inner sides of the domes
  • Compatible with the CVF4 heater/ventilator that keeps the domes free from ice and dew
  • Measures reflected solar radiation when inverted
  • Provides measurements in direct sunlight, under plant canopies, when the sky is cloudy, and in artificial light
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

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技术说明

CMP6以保护在两层玻璃穹顶罩中的高质量黑化热电堆来测量太阳辐射。它在285至2800 nm波段内具有平直的光谱灵敏度，因而非常适合自然太阳光测量的应用中，以及冠层下、温室中或建筑的太阳辐射监测，还可倒置安装用于监测反射短波辐射。

一支干燥剂筒用于防止CMP6的穹顶内侧结露。Campbell Scientific还提供CVF3加热通风罩，可防止辐射表穹顶表面结冰或结露。

CMP6含有一个直接固定的白色防辐射盖子，用于减小太阳辐射增温。自带的水平泡和可调水平螺丝，使得传感器并不需要额外的调平底座。

CMP6产生微伏级信号，可由Campbell Scientific数据采集器直接测量。

产品规格

Sensor High-quality blackened thermopile protected by two glass domes
Measurement Description Monitors solar radiation for the full solar spectrum range
ISO Classification Class B (first class)
Spectral Range 285 to 2800 nm
Sensitivity 5 to 20 μV W-1 m2
Temperature Dependence of Sensitivity < 4% (-10° to +40°C)
Response Time < 18 s (95% of final value)
Zero Offset Due to Thermal Radiation < 15 W/m2 (200 W/m2)
Non-Stability < 1% (change/year)
Non-Linearity < 1% (0 to 1000 W/m2)
Directional Error < 20 W/m2 (up to 80° with 1000 W/m2 beam)
Tilt Error < 1%
Level Accuracy 0.1°
Impedance 20 to 200 Ω
Operating Temperature Range -40° to +80°C
Typical Signal Output 0 to 20 mV (for atmospheric applications)
Maximum Irradiance 2000 W/m2
Expected Daily Uncertainty < 5%
Dome Diameter 5 cm (2 in.)
Width 15 cm (5.9 in.) with shield
Height 9.25 cm (3.64 in.)
Weight 0.9 kg (2 lb) with 10.1 m (33 ft) cable

兼容性

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

数据采集器

Product Compatible Note
CR1000X (retired)
CR300 (retired)
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR850 (retired)

Additional Compatibility Information

Mounting

The CMP6 has a bubble level and two leveling feet, which allow it to be leveled without using a leveling base. This pyranometer mounts to a mast, crossarm, or pole (1.0 in. to 2.1 in. OD) via the CM255 or CM255LS mounting stand. The CMP6 should be mounted away from all obstructions and reflective surfaces that might adversely effect the measurement.

常见问题解答

CMP6-L: 4

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  1. To create a network of accurate solar irradiance measurements, do all of the stations need a Class A (secondary standard) pyranometer?

    The ISO and WMO classify First Class pyranometers, such as the CMP6-L, as suitable for network operations. However, if accuracy is of paramount concern, consider using Class A pyranometers, such as the CMP11-L and CMP21-L, instead.

  2. Do the CMP6-L, CMP11-L, and CMP21-L require a power supply?

    No. These are all passive devices that create their own voltage signal as a response to the measurement being made. There is, however, a heater and ventilator for these sensors (CVF4-L) that requires a power supply.

  3. Are the CMP6-L, CMP11-L, and CMP21-L similar in accuracy and measurements?

    All of these pyranometers measure the amount of solar short-wave radiation incident on a surface. Because of their accuracy and performance level, the CMP11-L and CMP21-L are classified by the International Organization for Standardization (ISO) and World Meteorological Organization (WMO) as Secondary Standard sensors, representing the highest level of measurements made by pyranometers. In comparison, the CMP6-L is classified as a First Class sensor, which is the middle classification for pyranometers. (Second Class is the lowest pyranometer classification.)

  4. What are some common issues related to using thermopile instruments?

    Because of the loss of IR radiation, nearly all thermopile instruments typically have a negative offset. This offset is most easily visible at night-time, when a small negative value is read instead of zero. This same offset is present during the daytime, but it is not as visible because of the large solar signal.

    Another common issue involves leveling an instrument. Leveling a thermopile instrument can cause errors in the direct beam component because the cosine response is not correct. These errors are more notable when the sun is close to the horizon because the angle is so shallow.

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