CS655 时域反射土壤含水量传感器

Name: CS616 - 时域反射土壤含水量传感器
Brand: Campbell Scientific

需求报价提问提问

土壤含水量，温度和电导率传感器 / CS655

高电导率土壤中测量精度更精确

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技术说明
产品规格
兼容性
相关技术文档
视频与教程
下载
常见问题解答
案例研究

概览

CS655 是多参数智能传感器，使用革新的技术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。探针长度比CS650更短，适合使用在基岩类土壤中。

备注：如果用于ET107气象站，请选择CS655-LC。

优势与特点

更大的采集体积，减少了误差
对土壤质地和电导率的影响进行测量修正
估算很多种矿质土类型土壤中的含水量
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

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相似产品

CS650 时域反射土壤含水量传感器

CS655-LC 12 cm长探针的时域反射土壤含水量，用于ET107气象站

CS616 时域反射土壤含水量传感器

HS2 HydroSense II显示器

CS658 20 cm长探针的土壤含水量传感器，用于HydroSense II ®

CS659 12 cm长探针的土壤含水量传感器，用于HydroSense II ®

SoilVue 10 TDR 土壤剖面传感器

技术说明

The CS655 consists of two 12-cm-long stainless steel rods connected to a printed circuit board. The circuit board is encapsulated in epoxy and a shielded cable is attached to the circuit board for data logger connection.

The CS655 measures propagation time, signal attenuation, and temperature. Dielectric permittivity, volumetric water content, and bulk electrical conductivity are then derived from these raw values.

Measured signal attenuation is used to correct for the loss effect on reflection detection and thus propagation time measurement. This loss-effect correction allows accurate water content measurements in soils with bulk EC ≤8 dS m^-1 without performing a soil-specific calibration.

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.

产品规格

Measurements Made	Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature
Required Equipment	Measurement system
Soil Suitability	Short rods are easy to install in hard soil. Suitable for soils with higher electrical conductivity.
Rods	Not replaceable
Sensors	Not interchangeable
Sensing Volume	3600 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	120 mm (4.7 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	240 g (8.5 oz) without cable

Current Drain
Active (3 ms)	45 mA typical (@ 12 Vdc) 80 mA (@ 6 Vdc) 35 mA (@ 18 Vdc)
Quiescent	135 µA typical (@ 12 Vdc)

Electrical Conductivity
Range for Solution EC	0 to 8 dS/m
Range for Bulk EC	0 to 8 dS/m
Accuracy	±(5% of reading + 0.05 dS/m)
Precision	0.5% of BEC

Relative Dielectric Permittivity
Range	1 to 81
Accuracy	±(3% of reading + 0.8) from 1 to 40 for solution EC ≤ 8 dS/m ±2 (from 40 to 81 for solution EC ≤ 2.8 dS/m)
Precision	< 0.02

Volumetric Water Content
Range	0 to 100% (with M4 command)
Water Content Accuracy	±1% (with soil-specific calibration) where solution EC < 3 dS/m ±3% (typical with factory VWC model) where solution EC < 10 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

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
CR1000X (retired)
CR300 (retired)
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR850 (retired)

Additional Compatibility Information

RF Considerations

External RF Sources

External RF sources can affect the probe’s operation. Therefore, the probe should be located away from significant sources of RF such as ac power lines and motors.

Interprobe Interference

Multiple CS655 probes can be installed within 4 inches of each other when using the standard data logger SDI-12 “M” command. The SDI-12 “M” command allows only one probe to be enabled at a time.

Optional Installation Tool

CS650G Rod Insertion Guide 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 was not used. It makes pilot holes into which the rods of the sensors can then be inserted.

视频与教程

Measuring Water in the Soil: A Webinar - 32:06

Webinaire sur l’humidité du sol - 18:24

Seminario web Humedad de Suelo - 20:51

SDI-12 Sensors | Transparent Mode - 7:06

SDI-12 Sensors | Watch or Sniffer Mode - 3:20

下载

CS650 / CS655 Firmware v.2 (429 KB) 02-12-2015

Current CS650 and CS655 firmware.

Note: The Device Configuration Utility and A200 Sensor-to-PC Interface are required to upload the included firmware to the sensor.

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常见问题解答

CS655: 55

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With regard to the CS650 and the CS655, is there a generic calibration equation for organic soil?

No. The equation used to determine volumetric water content in the firmware for the CS650 and the CS655 is the Topp et al. (1980) equation, which works for a wide range of mineral soils but not for organic soils. In organic soils, the standard equations in the firmware will overestimate water content.

When using a CS650 or a CS655 in organic 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 the CS650/CS655 manual. A linear or quadratic equation that relates period average to volumetric water content will work well.
What is the warranty for the CS650 and the CS655?

The CS650 and CS655 are warranted by Campbell Scientific to be free from defects in materials and workmanship under normal use and service for 12 months from the date of shipment. For further details, see the “Warranty” section of the CS650/CS655 manual.
How are the CS650 and the CS655 different?

The CS650 has rods that are 30 cm long, and the CS655 has rods that are 12 cm long. The difference in rod length causes some changes in specifications. For example, the CS650 is slightly more accurate in its permittivity and water content readings, but the CS655 works over a larger range of electrical conductivity. In addition, the CS650 handles a larger measurement volume and provides good accuracy in low EC (electrical conductivity) sand and sandy loam. The CS655 is typically more accurate in soil, works well over a wide range of soil textures and EC, and is easier to install because of its shorter rods.
With the CS650 and the CS655, where is the soil temperature measurement made?

A thermistor is encased in the epoxy head of the sensor next to one of the stainless-steel rods. This provides an accurate point measurement of temperature at the depth where that portion of the sensor head is in contact with the soil. This is why a horizontal placement is the recommended orientation of the CS650 or CS655. The temperature measurement is not averaged over the length of the sensor rods.
Can the CS650 and the CS655 measure water content in mine tailings?

Mine tailings are highly corrosive and have high electrical conductivity. Some customers have successfully used water content reflectometers, such as the CS650 or the CS655, to measure water content in mine tailings by coating the sensor rods with heat-shrink tubing. This affects the sensor output, and a soil-specific calibration must be performed. Care must be taken during installation to avoid damaging the heat-shrink tubing and exposing the sensor’s rods. In addition, covering the sensor’s rods invalidates the bulk electrical conductivity reading. Unless the temperature reading provided by the CS650 or the CS655 is necessary, a better option may be to use a CS616 with coated rods.
Can the CS650 and the CS655 measure water content in frozen soil?

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. When liquid water freezes, its dielectric permittivity drops to 3.8, essentially making it look like soil particles to the sensor. A CS650 or CS655 installed in soil that freezes would show a rapid decline in its volumetric water content reading with corresponding temperature readings that are below 0°C. As the soil freezes down below the measurement range of the sensor, the water content values would stop changing and remain steady for as long as the soil remains frozen.
When is it more suitable to use a CS655 rather than a CS650?

In soil that has a significant fraction of fines (loam, silt loam, silty clay loam, clay loam, clay), the CS655 is a suitable option because these soils tend to be more electrically conductive, and the CS655 operates over a larger range of electrical conductivity than the CS650. In applications where a smaller measurement volume is desired, such as larger greenhouse pots, the 12 cm long rods of the CS655 are preferable to the 30 cm long rods of the CS650.
With the CS650 and the CS655, where is the electrical conductivity measurement made?

The bulk electrical conductivity (EC) measurement is made along the sensor rods, and it is an average reading of EC over that distance at whatever depth the rods are placed.
Can the cable for the CS650 or CS655 be shortened?

Modifications to the CS650 or CS655, including shortening the cable, will void the warranty. However, shortening the cable will not affect the sensor’s performance. If a decision is made to shorten the cable, care should be taken to avoid damaging the cable jacket and exposing bare wire except at the ends that connect to the data logger or multiplexer terminals.
Can the CS650 and the CS655 measure water level?

The CS650 and the CS655 are not ideal sensors for measuring water level. However, these sensors do respond to the abrupt change in permittivity at the air/water interface. A calibration could be performed to relate the period average or permittivity reading to the distance along the sensor rods where the air/water interface is located. From that, the water level can be determined. The permittivity of water is temperature dependent, so a temperature correction would be needed to acquire accurate results.

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概览

优势与特点

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相似产品

技术说明

产品规格

Current Drain

Electrical Conductivity

Relative Dielectric Permittivity

Volumetric Water Content

Soil Temperature

兼容性