土壤水势传感器 / 257-L
恶劣环境下，测量结果仍然可靠
不需维护
不需维护
概览
The 257, manfuactured by Watermark, is a solid-state, electrical-resistance sensing device with a granular matrix that estimates soil water potential from 0 to -200 kPa (typically wetter or irrigated soils). It connects directly to your data logger.
优势与特点
- Survives freeze-thaw cycles
- Compatible with most Campbell Scientific data loggers
- Contains blocking capacitors in its cable that minimize galvanic degradation and measurement errors due to ground loops
- Buffers salts in soil
- Rugged, long-lasting sensor
图像
The 257 includes blocking capacitors in its
cable to mitigate ground loops and galvanic degradation.
相似产品
技术说明
257 通过测量电阻来确定土壤水势。227潮湿，电阻值低，反之，电阻值则高。
257 由嵌入在参比复合材料中的两支同轴电极组成。复合材料被合成膜包裹可避免老化。内部的石膏板可以缓冲灌溉土壤中的盐度水平。
257 的构造允许其整年皆可浸入在土壤中（某些情况下），避免移动传感器。
产品规格
| Diameter | 1.91 cm (0.75 in.) |
| Length | 8.26 cm (3.25 in.) |
| Weight | 360 g (0.8 lb) |