An automated vacuum extraction control system for soil water percolation samplers
An automated vacuum extraction control system for soil water percolation samplers
复制标题
土壤水渗滤采样器的自动真空抽取控制系统
DOI：
10.2136/sssaj2003.1000
复制
发表时间：
2003
影响因子：
2.9
通讯作者：
D. C. Kincaid
中科院分区：
文献类型：
--
作者：
R. Lentz;D. C. Kincaid
应用于土壤渗水采样器的真空允许收集
大孔道液体和基质孔道液体。这些产品的性能
现场采样器在调整抽气真空度时得到改善
与周围土壤的拉力相一致。这是特别的
在监视空间分布的采样器网络时很重要
也适用于安装在中到细质土中的取样器。我们设计了
一种更有效地收集包气带的真空抽提系统
土壤溶液样本。单个真空泵、真空箱和
空气干燥机为12个土壤水采样点提供真空供应
通过一个分支的聚乙烯管网。一种真空控制器，包括
两个便宜的压力传感器，一个电压调节器，
开发了继电器和电磁阀，并进行了现场安装测试。
数据记录器操作控制器，监控抽气真空
和周围土壤水势，并调整相对真空度
在每个渗滤液采样点。全自动真空控制器
成功地将取样器提取压力维持在成比例的水平
环境土壤水势，并提供额外的好处
记录压力值，以供后续数据解释使用。
A vacuum applied to soil water percolation samplers permits collection
of both macro- and matrix-pore liquids. Performance of these
field samplers is improved when the extraction vacuum is adjusted in
accordance with the tension in the surrounding soil. This is particularly
important when monitoring a network of spatially distributed samplers
and for samplers installed in medium to fine textured soils. We designed
a vacuum extraction system to more efficiently collect vadose-zone
soil solution samples. A single vacuum pump, vacuum tank, and
air dryer provided a vacuum supply for 12 soil water sampling sites
via a branching polyethylene pipe network. A vacuum controller containing
two inexpensive pressure transducers, a voltage regulator,
relay, and solenoid valve was developed and tested for field installation.
Data loggers operated the controllers, monitored extraction vacuum
and ambient soil water potential, and adjusted relative vacuum
at each percolation sampling site. The automated vacuum controllers
successfully maintained sampler extraction pressures at levels proportional
to ambient soil water potential and provided the added benefit
of recording the pressure values for use in subsequent data interpretation.