Development of Compact CO_2 Monitoring System in the Coastal Area.

我们已经在实地测试了该系统：石垣岛，琉球西南部。该系统引入了一个气体渗透膜管作为平衡器与NH3进行测量。该系统体积小、重量轻、功耗低，重量为30 kg，体积为50 × 50 × 50 cm，功率为300 W。在0 ~ 1000 ppm范围内，系统的稳定性小于5 ppm，足以满足CO_2浓度变化较大的海岸带监测的需要。我们将该系统与静态混合器/气泡型平衡器进行比较。测定的CO_2值彼此相差达20 ppm。这种差异是由于船的摆动导致静态混合器/气泡型平衡器内部的压力变化造成的。我们的膜平衡系统更稳定。经过3年的研究，研制成功了一套紧凑型CO_2监测系统，完成了初步设计和实际测试。我们不断地把这个系统刷成更广泛使用的一个。

We have tested the system in the field : Ishigaki Island, the southwest Ryukyus. The system introduces a gas permeable membrane tube as the equilibrator with NDIR for measurement. It has been succeeded in reducing size, weight and power consumption : 30kg, 50x50x50cm and 300W.The stability of the system is less than *5 ppm within a range of 0 to 1000 ppm, which is enough for coastal zone monitoring where a large change in CO_2 occurrs. We compared the system with a static mixer/bubble type equilibrator. The measured CO_2 values differed with each other as much as 20 ppm. This discrepancy resulted from the changes in pressure inside the equilibrator of static mixer/bubble type by swing of the boat. Our system with a membrane equilibrator is more stable. Through the 3-year research, the development of a compact CO_2, monitoring system has been succeeded for its basic designation and practical test. We continue to brush up this system to be more widely used one.