便携式多参数土壤呼吸测量系统

GT5000便携式多参数土壤呼吸测量系统是芬兰Gasmet公司生产的一款基于傅里叶变换红外光谱（FTIR）技术的便携式高精度土壤温室气体排放监测系统。该仪器可以在数秒内同时测定多种主要的温室气体成分，如：N₂O，CH₄，CO₂，H₂O，CO和NH₃，且测量精度可达ppb级。GT5000便携式多参数土壤呼吸测量系统可用于农田，湿地，森林，牧场，电厂，火灾现场等各种环境中的温室气体通量测量。

GT5000配备功能强大的Calcmet软件，它支持测量结果的在线查看和以往测量数据的进行对比分析。结果以电子表格的形式输出，便于用户处理数据；用户可以简单地通过测得的气体浓度计算出气体通量。

主要特点

l 采用傅里叶变换红外光谱技术；

l 同时测量N₂O，CH₄，CO₂，H₂O，CO和NH₃等6种温室气体，最多可同时测量50种气体；

l 多种无线连接方式，如WI-FI或蓝牙。

l 无需专业知识，用户可通过导航进行操作；

l 一键测量和即时的在线处理结果；

l 五种不同的视图展示相关的测量信息；

l 自动气室有机械臂，可缓慢升降；

l 通气口的设计可确保稳定的大气压力，且不会通过反向扩散影响测量；

l 气室的内部进出回路可有效的促进气体混合。

主要参数

1.测量原理：FTIR傅里叶变换红外光谱；

2.气体测定种类：可同时测定50种气体；

3.响应时间：通常<120s，基于所测定的气体和测量时间；

4.电池：锂离子电池，单节电池可维持3小时；

5.充电电源：115/230V AC；

6.分析软件：Calcmet（需Win7或10操作系统）；

7.数据连接：USB，以太网，蓝牙，WI-FI；

8.采样泵流速：2 L/min；

9.气体采样过滤：带有2μm孔径聚四氟乙烯过滤器的采样探头；

10. 采样气体进/出口配件：6mm快速接头；

11.外壳：大小：450×287×166 mm(H×W×D)；材料：ABS PC；防护等级：IP54（适用于野外便携式设备）；

12.重量：9.4kg（含电池）/8.0kg（不含电池）

13.光谱仪：分辨率：8cm^-1；扫描频率：10次/s；检测器：碲镉汞(MCT)光电探测器（珀尔帖致冷）；

分束器材料：硒化锌（ZnSe）；波数范围：900-4200cm^-1；

14.样品室结构：多通道，固定光程长度5m；反射镜：固定式，镀金；体积：0.5L；

操作条件

15.采样气体压力：环境压力；

16.采样气体温度：环境温度（-5~40℃），无冷凝；

17.操作温度：-5~40℃（短期），5~30℃（长期）；

性能指标

18.零点漂移：在环境背景下每24小时内漂移小于测量范围的2%；

19.灵敏度漂移：无；

20.线性偏差：小于测量范围的2%；

21.温度漂移：每10K温度变化，小于测量范围的1%。(带温度补偿)

22.压力影响：对于1%的测量压力变化，测量值将会出现1%的变化。（带压力补偿）

23.周围环境测量间隔：建议24h。

24.几种主要温室气体的检测范围和检测限

H2O：0-5%；最小检测限：0.010 Vol-%；    

N2O：0-50 ppm；  最小检测限：7ppb；

NH3：0-100 ppm； 最小检测限：70ppb；

CO：0-200 ppm；  最小检测限：70ppb；

CO2：0-2000 ppm； 最小检测限：5ppm；

CH4：0-100 ppm； 最小检测限：40ppb；

eosAC气室指标

25. 气室体积：1969cm³；

26.气室覆盖面积：182cm²；

27.工作电压：12V DC；

28.测定功率：<8W

29.待机功耗：<1W

30.重量：约5kg

31.管路长度（分析仪与气室间）：10米或30m

32.辅助分析仪接口：3个

33.后期处理与可视化软件：eosAnalyze-AC

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