CS650由连接到印刷电路板的两个30厘米长的不锈钢棒组成。电路板封装在环氧树脂中,并且屏蔽电缆连接到电路板以进行数据记录器连接。
attenu CS650措施传播时间、信号ation, and temperature. Dielectric permittivity, volumetric water content, and bulk electrical conductivity are then derived from these raw values.
测量的信号衰减用于校正对反射检测的损耗效果,从而衡量传播时间测量。该损失效应校正允许散装EC≤3dsm的土壤中准确的水含量测量-1不进行土壤特定校准。
Soil bulk electrical conductivity is also calculated from the attenuation measurement. A thermistor in thermal contact with a probe rod near the epoxy surface measures temperature. Horizontal installation of the sensor provides accurate soil temperature measurement at the same depth as the water content. Temperature measurement in other orientations will be that of the region near the rod entrance into the epoxy body.
| 测量结果 | Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature |
| 需要设备 | Measurement system |
| 土壤适宜性 | 具有大型传感体积(> 6L)的长杆适用于具有低至中等电导率的土壤。 |
| 棒子 | 不可替换 |
| Sensors | 不可互换 |
| 传感卷 | 7800厘米3.(在每个探头杆周围〜7.5厘米半径,在杆的末端超过4.5厘米) |
| Electromagnetic | CE兼容 满足EN61326保护防止静电放电和浪涌的要求。 |
| 工作温度范围 | -50°至+ 70°C |
| Sensor Output | SDI-12;串行RS-232 |
| Warm-up Time | 3 S. |
| 测量时间 | 3.ms to measure; 600 ms to complete SDI-12 command |
| Power Supply Requirements | 6至18 VDC(必须能够提供45 mA @ 12 VDC。) |
| 最大电缆长度 | 610米(2000英尺)组合长度最多25个传感器连接到相同的数据记录器控制端口 |
| 杆间距 | 3.2 mm (1.3 in.) |
| 入口保护等级 | IP68. |
| 棒直径 | 3.2 mm(0.13英寸) |
| Rod Length | 3.00 mm (11.8 in.) |
| 探针头尺寸 | 85 x 63 x 18 mm(3.3 x 2.5 x 0.7英寸) |
| 电缆重量 | 每米35克(每英尺0.38盎司) |
| Probe Weight | 280 g (9.9 oz) without cable |
当前的流失 |
|
| Active (3 ms) |
|
| Quiescent | 135μA典型(@ 12 VDC) |
电导率 |
|
| 范围for Solution EC | 0 to 3 dS/m |
| 范围for Bulk EC | 0 to 3 dS/m |
| 准确性 | ±(5% of reading + 0.05 dS/m) |
| Precision | 0.5%的bec |
相对介电常数 |
|
| 范围 | 1至81 |
| 准确性 |
|
| Precision | <0.02 |
体积含水量 |
|
| 范围 | 0 to 100% (with M4 command) |
| 含水量精度 |
|
| Precision | <0.05% |
Soil Temperature |
|
| 范围 | -50°至+ 70°C |
| 解决 | 0.001°C. |
| 准确性 |
|
| Precision | ±0.02°C |
笔记:以下显示了显着的兼容性信息。它不是所有兼容或不兼容产品的全面列表。
| 产品 | 兼容的 | 笔记 |
|---|---|---|
| 21X.(退休) | ||
| CR10(退休) | ||
| CR1000.(退休) | ||
| CR1000X. | ||
| CR10X(退休) | ||
| CR200X(退休) | ||
| CR206x.(退休) | ||
| CR211x.(退休) | ||
| CR216X(退休) | ||
| CR23X(退休) | ||
| CR295X(退休) | ||
| CR300. | ||
| CR300.0 | ||
| CR310 | ||
| CR500.(退休) | ||
| CR5000.(退休) | ||
| CR510(退休) | ||
| CR6. | ||
| CR800 | ||
| CR850. | ||
| CR9000(退休) | ||
| CR9000x.(退休) |
外部RF源可以影响探头的操作。因此,探头应远离RF的重要来源,如交流电源线和电机。
当使用标准数据记录器SDI-12“M”命令时,多个CS650传感器可以在4英寸内安装在4英寸内。SDI-12“M”命令一次只能启用一个探头。
The CS650G makes inserting soil-water sensors easier in dense or rocky soils. This tool can be hammered into the soil with force that might damage the sensor if the CS650G were not used. It makes pilot holes into which the rods of the sensors can then be inserted.
当前CS650和CS655固件。
注意:设备配置实用程序和A200传感器到-CC接口需要将附带的固件上载到传感器。
与之相关的常见问题解答数量CS650:54
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No. The principle that makes these sensors work is that liquid water has a dielectric permittivity of close to 80, while soil solid particles have a dielectric permittivity of approximately 3 to 6. Gasoline and other hydrocarbons have dielectric permittivities in the same range as soil particles, which essentially make them invisible to the CS650 and the CS655.
The electrical conductivity (EC) of sea water is approximately 48 dS/m. The CS650 can measure permittivity in water with EC between 0 and 3 dS/m. EC readings become extremely unstable at conductivities higher than 3 dS/m and are reported as NAN or 9999999. Because EC is part of the permittivity equation, an EC reading of NAN leads to a permittivity reading of NAN as well. Thus, the CS650 cannot provide good readings in sea water.
关于海冰,当海水冻结时,电导率显着下降,并且介电常数从大约88到大约4变化,因为水从液体变为固态。EC和允许率下降到CS650测量范围内的水平,预计传感器将在海冰中提供有效的读数。传感器坚固耐用,可以承受寒冷的温度。然而,随着冰熔化,将有一个点,导电率变得太高,无法获得有效读数以获得介电常数或导电性。
对CS650或CS655的修改,包括缩短电缆,将禁止保修。但是,缩短电缆不会影响传感器的性能。如果做出决定缩短电缆,则应注意,避免损坏电缆护套并曝光裸线,除了连接到数据记录器或多路复用器终端的端部。
是的。在安装过程中保持传感器杆平行于砾石尤其困难,但可以完成。砾石有大的孔隙空间,迅速排出,因此水含量读数可能会显示饱和度和非常干燥之间的快速变化。如果干燥端的含水量的小变化感兴趣,则可能需要进行土壤特异性校准以将周期平均直接转化为体积含水量。
预期流床中饱和沉积物的介质率在25和42之间读取,而水的介电常数接近80.安装在饱和沉积物中的CS650或CS655可用于监测沉积物侵蚀。如果介电常数连续增加超出初始饱和读数,则这表明传感器杆周围的沉积物已经侵蚀并被水替换。可以执行校准,其将泄密性与仍然在沉积物中的杆的深度相关。
CS650和CS655不是用于测量水位的理想传感器。然而,这些传感器确实响应了空气/水界面处的介质变化。可以执行校准以将周期平均值或允许读数涉及沿着空气/水界面所在的传感器杆的距离。从中,可以确定水位。水的介电常数是温度依赖性,因此需要一种温度校正来获得准确的结果。
No. The abrupt permittivity change at the interface of air and saturated soil causes a different period average response than would occur with the more gradual permittivity change found when the sensor rods are completely inserted in the soil.
例如,如果将CS650或CS655插入具有0.4的体积含水量0.4的体积含水量的饱和土中,则传感器将提供不同的时期平均水平和介质读数,而是当探针完全插入相同的土壤时体积含水量为0.2。
不可以。用于确定CS650和CS655的固件中体积含水量的等式是TopP等人。(1980)方程,其适用于各种矿物土壤,但不一定用于通常具有高有机物质含量和高粘土含量的人造土壤。在这种土壤中,固件中的标准方程将高估含水量。
When using a CS650 or a CS655 in artificial soil, it is best to perform a soil-specific calibration. For details on performing a soil-specific calibration,refer to “The Water Content Reflectometer Method for Measuring Volumetric Water Content” section in theCS650/CS655 manual。将周期平均水平与体积水含量相关的线性或二次方程将很好地工作。
不可以。温度传感器位于传感器的环氧树脂头部内,在其中一个传感器杆旁边。不锈钢棒不是导热性的,因此报告的土壤温度读数实际上是传感器头的温度。如果CS650或CS655水平安装,这是优选的方法,则传感器头部将与土壤相同的温度,土壤温度值将准确。但是,如果传感器垂直安装,并且/或在地上的传感器头部安装,土壤温度读数将不那么准确。因为传感器方向未知,因此没有将温度校正写入固件。
是的。There is surge protection built into the sensor electronics. The sensor survives a surge of 2 kV at 42 ohm line-to-ground on digital I/O and 2 kV at 12 ohm line-to-ground on power. It also survives a surge of 2 kV at 2 ohm line-to-ground on the rods.
If additional surge protection is required, consider using theSVP100带安装硬件的浪涌电压保护器DIN导轨。
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