CPEC310 Closed Circuit Vortex System

1. summary

CPEC310 is a complete closed-loop eddy related flux observation system, suitable for long-term positioning observation of CO2, H2O, heat and momentum exchange in the atmospheric boundary layer. The complete system composition of CPEC310 includes EC155 closed-circuit infrared CO2/H2O analyzer, CSAT3A three-dimensional ultrasonic anemometer, CR6 data collector, sampling pump, three valve module, which can automatically correct the zero point and span of carbon dioxide (water is manually corrected), and is compatible with CDM-A116 analog input expansion module, allowing for the integration of additional sensors.

The gas analyzer is equipped with a brick vortex inletThe American brick number 9217692 and the small sample pool (5.9ml) have lower flow rates than other closed-loop vortex systems while maintaining good frequency response (cut-off frequency 4.3Hz). In addition, compared to using traditional inline filters, this brick like design allows the entire system to maintain ideal frequency response while requiring almost no maintenance. The lower flow rate results in a lower power consumption of CPEC310 compared to the total power of all closed-loop vortex systems, only 12W. The complete CPEC310 is produced by Campbell Corporation in the United States, including a data collector and EasyFlux for calculating and correcting flux data ™ DL software makes CPEC310 a more reliable closed-loop vortex system.

2. Advantages and Characteristics

Scalable, excellent system andCR6 data collector and EasyFlux DL software calculate and calibrate data with a frequency of up to 20Hz

Using a three valve moduleCPEC310 has become the only closed-loop eddy current measurement system on the market that can perform automatic zero point and CO2/H2O span correction

There are optional additional ports that can be connected to energy balance and atmospheric environment sensors, etc

Ideal system suitable for both high and low towers

The entire system is designed to be simple to use and fully functional

3. Detailed description

Volume of small sample pool for gas analyzer(5.9 mL) Minimized the sample residence time as much as possible (at rated flow rate) 50ms@7L /min)。 This provides excellent frequency response (5.8 Hz half power bandwidth) and lower total system power (12 W).

Vorticity related measurement

The measurement of CO2 and H2O is carried out using an EC155 closed-circuit gas analyzer. Use CSAT3A three-dimensional ultrasonic anemometer to measure three-dimensional wind speed and ultrasonic virtual temperature.

CPEC310 system control box

CPEC310 has two system control parts: one is placed inside a fiberglass protective box and installed with CR6 data collector, pump module, three valve module, and optional CDM-A116 digital 16 channel expansion module; **This is EC100 used for data computation and processing. CPEC310 can also be equipped with a scrubbing module for automatic zeroing of EC155.

CPEC310 pump module

The pump module isA standard component of CPEC310 system, consisting of a small double headed diaphragm pump and a brushless DC motor installed inside a fiberglass casing. The pump module is connected to the CPEC310 system control box through an integral cable. The CPEC310 system control box provides power, temperature measurement and control, pressure measurement and control, and pump speed measurement and control.

4. References:

1. Preliminary Review of Energy Exchange Characteristics in Near Surface Regions of Desert Areas-Li Zhenjie;He Qing;eric·Maimaiti Ming

2. Energy closure analysis of grassland in the upper reaches of the Kizil River valley in Kyrgyzstan-Wang Xihua;Xu Junrong

3. Surface Radiation and Energy Balance in the hinterland of the Taklamakan Desert-Yang Fan;Wang Shunsheng;He Qing;Paul Verhoeven;Yang Xinghua;Zheng Xinqian;Wang Yi;Cai Wenjun;Maimaiti Aili·Maimaitiyiming

4. "Surface Energy Flux and Closure Rate of Semi arid Grasslands on the Loess Plateau" [J]. Yue Ping, Zhang Qiang, Yang Jinhu, Li Hongyu, Sun Xuying, Yang Qiguo, Zhang Jianzhong

5. "Changes in Effective Radiation on the Surface of the Qinghai Tibet Plateau and Their Effects on Surface Soil Temperature" [J]. Li Ren, Zhao Lin, Ding Yongjian, Shen Yongping, Ji Guoliang, Liu Guangyue, Du Erji, Xiao Yao, Sun Linchan, Liu Yang, Shi Wei

6. Analysis of Climate Characteristics of Land Surface Temperature and Energy in Semi arid Regions of the Loess Plateau [J]. Sun Zhaoxuan, Zhang Qiang

7. "Analysis of Reflectance Characteristics and Influencing Factors of Different Underlying Surfaces in the Upper and Middle Reaches of Heihe River" [J]. Sun Jun, Hu Zeyong, Xun Xueyi, Peng Wen, Lv Bin, Xu Lijiao

8. Observation and Analysis of Near Surface Atmospheric Turbulence Characteristics in Spring and Summer in Desert Hinterland [J]. Miao Qilong, Wen Yating, He Qing, Li Lanlan, Wang Jing

9. Comparative Study on Surface Radiation and Energy Balance Characteristics in Winter and Summer in Dunhuang Gobi Desert [J]. Liu Hongyi, Yang Xingguo, Zhang Qiang, Wang Runyuan, Wang Sheng, Wang Heling

10. Analysis of Multi time Scale Characteristics of Surface Energy Balance during Corn Growth Period and Exploration of Reasons for Imbalance [J]. Guo Jianxia, Bian Lingen, Dai Changjiu