该产品的可用性有限。它将取代：SR30-L。当不再可用时，某些配件，替换零件或服务仍可提供。
概述
VU01，manufactured by Hukseflux Thermal Sensor,is a high-quality ventilation unit for use with pyranometers and pyrgeometers. Its purpose is to improve the dependability of the measurement. The measurement accuracy improves because the offsets are reduced. The reliability benefits from the prevention of dew and frost formation, as well as the quick evaporation and sublimation of water and snow. ISO/TR 9901 “Solar Energy - Field Pyranometers - Recommended practice for use” recommends the use of ventilators where high accuracy and reliability are required. The VU01 is designed in agreement with the recommendations of ISO/TR 9901 and BSRN.
Read MoreBenefits and Features
- Reduces zero offsets by promoting thermal equilibrium of all radiometer components
- Prevents dew and frost formation
- Optional heating promotes evaporation of water droplets and sublimation of snow
- 可移动的灰尘过滤器
- Meets recommendations of ISO/TR 9901 for required high accuracy and reliability
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Detailed Description
The VU01 uses a 7.8 W fan and inlet filter to draw clean air over the pyranometer’s outer dome. The fan should operate continuously to reduce dust and dirt settling, to dissipate raindrops, and to stabilize the dome temperature.
The VU01 has dual 5 W heaters, which are used to raise the temperature of the dome slightly above ambient temperature and prevent the formation of dew and frost. Relays are recommended to control and source the appropriate power to the ventilator and heaters separately.
Improved Measurement Dependability
Ventilation promotes thermal equilibrium between all components of radiometers, and thereby reduces zero offsets. Dew and frost formation is prevented. Additional heating will promote the evaporation of water droplets and sublimation of snow. It should be noted that heating in combination with pyranometers will lead to increased thermal offsets, so heating is only recommended if necessary.
Operation
使用VU01很容易。VU01的足迹很小，可以防止积雪积聚。呼吸机功率相对较高，以增加气流。通常连续使用呼吸机；加热器通常由数据记录器控制。通风通常用于高准确度测量要求。在这种情况下，仍然存在高水平的仪器维护和圆顶清洁的需求；蒸发的水可能会在仪器圆顶上留下污渍。VU01的底部提供了对可移动防尘滤清器的访问。
有关VU01的更多信息，请下载制造商的产品手册or ask for the user manual.
Specifications
| 遵守标准 | ISO/TR 9901, BSRN operations manual |
| Rated Operating Power | 7.8 W时12 vdc（未加热） |
| Rated Operating Voltage Range | 10.8 to 13.2 V |
| Rated Operating Temperature Range | -40° to +70°C |
| Fan Status Signal | High/low output (optional use) |
| Heater | 5 and 10 W at 12 Vdc (optional use) |
| Increase of Air Temperature |
|
| Zero Offset A Reduction SR20 | 50％在0 W加热 |
| Offset SR20 by Heating |
|
| Offset IR20 by Heating |
|
| Cable Resistance | 0.3Ω/m（2 x0.15Ω/m） |
| Voltage Drop at 10 W Heating Power | 0.12 V/m |
| Footprint Diameter | 0.17 m（6.69英寸） |
| Maximum Cable Length | 5 m (17 ft) |
| Sensitivity |
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Compatibility
Note:The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Data Loggers
| Product | Compatible | Note |
|---|---|---|
| CR1000(retired) | ||
| CR1000X | ||
| CR200X(retired) | ||
| CR206X(retired) | ||
| CR211X(retired) | ||
| CR216X(retired) | ||
| CR3000 | ||
| CR5000(retired) | ||
| CR6 | ||
| CR800 | ||
| CR850 | ||
| CR9000X(retired) |
其他兼容性信息
VU01可能be used in combination with Hukseflux’s SR20, SR20-D1, SR20-D2, SR22, SR25, and SR25-D2 secondary standard pyranometers, as well as with IR20 and IR20WS research-grade pyrgeometers. The VU01 provides an airflow over the instrument body and dome and has two heaters on board to heat the air. The use of heating (5 W or 10 W) is optional. The VU01 ventilation unit runs on 12 Vdc voltage.
Mounting Considerations
VU01安装支架可用于将VU01固定在垂直或水平横梁上。VU01与CM245或CVF4安装支架不兼容。
Power Considerations
The 10 W of heater current drain is approximately 833 mA at 12 Vdc, and the 7.8 W ventilator’s current drain is approximately 650 mA at 12 Vdc. These power requirements are large compared to many Campbell Scientific products. Because of this, the VU01, depending on total system configuration, may not be powered by the data logger alone and should be connected to a 12 V power supply such as the CH150/200 and controlled using the Crydom relays.
Crydom继电器允许加热器的功率由数据记录程序程序控制，从而减少功耗。例如，只有当辐照度级别低于20 W/m时，数据记录器程序才能打开加热器2或者，如果有空气湿度的测量，则可以计算露点，如果空气降至传感器体温的1ºC之内，则可以切换继电器。
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