CS650 是多参数智能传感器，可以监测土壤体积含水量、容积电导率和土壤温度。它的信号输出方式为SDI-12，可用于大多数的 Campbell Scientific 数据采集器。如果采用到ET107蒸散站的话请选用CS650-LC。
产品特点：
1.更精确的土壤含水量测量，容积电导率可达 3 dS m-1，无需实施特定土壤校准
2.更大的采集体积，减少了误差
3.对土壤质地和电导率的影响进行测量修正
4.估算很多种矿质土类型土壤中的含水量
5.多功能的传感器 — 可测量介电常数、容积电导率（EC）和土壤温度
技术说明：
CS650含有连接到印刷电路板的2根30 cm长的不锈钢探针。电路板用环氧树脂封装，附着在电路板的带屏蔽线缆提供与数据采集器的连接。
CS650测量传输时间、信号衰减和温度；再从这些原始测量值解析得到介电常数、体积含水量和容积电导率。
测量的信号衰减是用于反射检测的损失效应及传播时间的修正。损失效应修正可以让探头在容积电导率 ≤3 dS m-1 的土壤中，测量出高精度的体积含水量，并不需要实施特定的土壤校准。
由衰减测量还可以计算得到土壤容积电导率。靠近环氧树脂表面的与探针保持热接触的热敏电阻用来测量温度。如果传感器水平安装，可以得到与土壤含水量测量相同深度的精确温度测量。如果以其它的方位安装传感器，那么温度测量只能代表环氧树脂附近探针的区域。
Measurements Made | Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature | ||
Required Equipment | Measurement system | ||
Soil Suitability | Long rods with large sensing volume (> 6 L) are suitable for soils with low to moderate electrical conductivity. | ||
Sensing Volume（探测体积） | 7800 cm3 (~7.5 cm radius around each probe rod and 4.5 cm beyond the end of the rods) | ||
Electromagnetic | CE compliant (Meets EN61326 requirements for protection against electrostatic discharge and surge.) | ||
Operating Temperature Range | -50° to +70°C | ||
Sensor Output | SDI-12; serial RS-232 | ||
Warm-up Time | 3 s | ||
Measurement Time | 3 ms to measure; 600 ms to complete SDI-12 command | ||
Power Supply Requirements | 6 to 18 Vdc (Must be able to supply 45 mA @ 12 Vdc.) | ||
Maximum Cable Length | 610 m (2000 ft) combined length for up to 25 sensors connected to the same data logger control port | ||
Rod Spacing | 32 mm (1.3 in.) | ||
Ingress Protection Rating | IP68 | ||
Rod Diameter | 3.2 mm (0.13 in.) | ||
Rod Length | 300 mm (11.8 in.) | ||
Probe Head Dimensions | 85 x 63 x 18 mm (3.3 x 2.5 x 0.7 in.) | ||
Cable Weight | 35 g per m (0.38 oz per ft) | ||
Probe Weight | 280 g (9.9 oz) without cable | ||
Electrical Conductivity电导率 | |||
Range for Solution EC | 0 to 3 dS/m | ||
Range for Bulk EC | 0 to 3 dS/m | ||
Accuracy | ±(5% of reading + 0.05 dS/m) | ||
Precision | 0.5% of BEC | ||
Relative Dielectric Permittivity相对介电常数 | |||
Range | 1 to 81 | ||
Accuracy | · ±(2% of reading + 0.6) from 1 to 40 for solution EC ≤ 3 dS/m · ±1.4 (from 40 to 81 for solution EC ≤ 1 dS/m) | ||
Precision | < 0.02 | ||
Volumetric Water Content体积含水量 | |||
Range | 0 to 99% (with M4 command) | ||
Water Content Accuracy | · ±1% (with soil-specific calibration) where solution · ±3% (typical with factory VWC model) where solution EC < 3 dS/m | ||
Precision | < 0.05% | ||
Soil Temperature | |||
Range | -50° to +70°C | ||
Resolution | 0.001°C | ||
Accuracy | · ±0.1°C (for typical soil temperatures [0 to 40°C] when probe body is buried in soil) · ±0.5°C (for full temperature range) | ||
Precision | ±0.02°C | ||
CS650时域反射土壤含水量传感器.pdf
