This product is not available for new orders.
| Services Available | |
|---|---|
| Repair | Yes |
| Calibration | No |
| Free Support | Yes |
概览
CS625测量从 0% 到水饱和的体积含水量。与CS616类似，不过CS625专门为CR200(X)/CR300系列数据采集器设计的探头，探头输出0到3.3 V的高频方波，可以被我们的CR200(X)/CR300数据采集器所读取。
优势与特点
- 高精度和高精密性
- 快速响应时间
- 设计用于长期的无人值守的含水量监测
- 探头钢针可以从地表插入，或者以任何方位埋入地下
图像
技术说明
CS625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，连接到电路板的4芯带屏蔽线缆给探头提供电源、激活测量以及监测输出信号。
CS625采用时域反射技术测量多孔介质（例如土壤）的体积含水量。类似TDR100的时域反射主机（测线器）对于CS625并不需要。CS625生成电磁脉冲，消逝行程时间和脉冲反射继而被测量，用于计算土壤体积含水量。
响应特征
沿CS625平行探针传输的信号被土壤溶液中的自由离子和土壤矿物成分的导电组分所消弱。在大多数应用中，该衰减并不足以影响CS625对土壤含水量变化的响应。CS625的响应曲线较好地被标准校准所描述。不过，在较大电导率的土壤、压实土、或较高粘土矿物含量的土壤中，应该特定土壤调整校准曲线。在CS625说明书提供了做这些校准调整的指导。
产品规格
| 操作温度范围 | 0° to 70°C |
| Probe-to-Probe Variability | ±0.5% VWC in dry soil, ±1.5% VWC in typical saturated soil |
| Precision | 0.1% VWC |
| Resolution | 0.1% VWC |
| Output | 0 to 3.3 V square wave (with frequency dependent on water content) |
| Current Drain | 65 mA @ 12 Vdc (when enabled) |
| Power Supply Voltage | 5 Vdc minimum; 18 Vdc maximum |
| Enable Voltage | 4 Vdc minimum; 18 Vdc maximum |
| Electromagnetic | CE compliant (Meets EN61326 requirements for protection against electrostatic discharge.) |
| Rod Spacing | 32 mm (1.3 in.) |
| 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) |
| Weight | 280 g (9.9 oz) without cable |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR295X (retired) | ||
| CR300 (retired) | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR5000 (retired) | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
RF Considerations
The RF emissions are below FCC and EU limits as specified in EN61326 if the CS625 is enabled less than 0.6 ms, and measurements are made less frequently than once a second. External RF sources can also affect the CS625 operation. Consequently, the CS625 should be located away from significant sources of RF such as ac power lines and motors.
Installation Tool
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. It replaces both the 14383 and 14384.
Data Logger Considerations
Each CS625 requires a single-ended input channel. A control port is used to enable one or more probes.
Note: A maximum of four CS625 probes can be measured by one CR200(X) datalogger. Valid channel options are analog channels 1 through 4.
常见问题解答
CS625: 29
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Yes, as long as the data logger can detect a 0 to 3300 mV square wave over a frequency range of 29 to 67 kHz.
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Running the cable through electrical conduit or PVC pipe will protect the cable from rodents. A trench 30 to 60 cm deep will protect it from most other human or animal activity. Some customers have found that extra cable can be coiled and left inside a box, such as an irrigation valve box or something similar. When using a box, seal any holes that are large enough for rodents to enter. When cables are exposed on the ground surface, some customers have found that wrapping the cables in the metal screening used for screen doors discourages animals from chewing on them.
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No. The output is too fast to be measured on the pulse channel of a 21X or CR7.
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The CS616/CS625 will survive frozen soil conditions, but the principle behind using bulk soil dielectric permittivity to estimate water content requires that the water be in liquid form. When soil water freezes, its dielectric drops from approximately 80 to 4, making it indistinguishable from soil solids. Consequently, the CS616/CS625 is not able to measure the water content of frozen soil.
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Yes. The rugged design of the CS616/CS625 protects the probe electronics from water under these conditions. Many CS616/CS625 reflectometers have been working reliably in very wet conditions for more than ten years.
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Cutting down rods should only be done at the user’s own risk. Doing so will cause the probe to need recalibration. Campbell Scientific does not provide calibrations for shorter rod lengths for the CS616 or the CS625.
With shorter rods, the probe will work, but there will be some reduction in accuracy because the length of the rod in the soil contributes a smaller proportion to the total transit time. However, probes with shorter rods will work in more saline soils.
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The CS616 and CS625 are water-content reflectometers with measurement electronics built into the probe head. The electronics generate a signal, which is sent directly to the data logger. The CS610, and other three-rod probes sold by Campbell Scientific, are TDR probes that have no electronic components and serve as wave guides for a time-domain reflectometer such as the TDR100.
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If a soil-specific calibration is performed, the CS616/CS625 may be used in soil with a maximum bulk electrical conductivity of 5 dS/m.
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If the electrical conductivity within the waste is less than 5 dS/m and there is good contact between the probe rods and the waste, the CS616/CS625 should respond predictably to changes in water content. The heterogeneous nature and changing bulk density of solid waste, however, make calibration difficult.
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Campbell Scientific does not recommend splicing sensor cables. Sensors may be ordered with custom cable lengths, and Campbell Scientific recommends purchasing the correct length for the application. If the sensor cable needs to be lengthened, a junction box (if practical) is a more favorable option than a splice.
Note: A splice will void the sensor warranty, but a junction box does not modify the sensor and therefore does not void the warranty.