Phản xạ kế đo lượng nước ngầm 12 cm kết nối SDI-12 Campbell Scientific CS655

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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CS655 12 cm Soil Water Content Reflectometer

Gọi 0904251826 để được trợ giúp

Phản xạ kế đo lượng nước ngầm 12 cm kết nối SDI-12 Campbell Scientific CS655


The CS655 is a multiparameter smart sensor that uses innovative techniques to monitor soil volumetric-water content, bulk electrical conductivity, and temperature. It outputs an SDI-12 signal that many of our dataloggers can measure. It has shorter rods than the CS650, for use in problem soils.

Benefits and Features

  • Larger sample volume reduces error

  • Measurement corrected for effects of soil texture and electrical conductivity

  • Estimates soil-water content for a wide range of mineral soils

  • Versatile sensor—measures dielectric permittivity, bulk electrical conductivity (EC), and soil temperature.

Detailed Description

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 datalogger 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.


Sensing Volume

3600 cm3 (~7.5 cm radius around each probe rod and 4.5 cm beyond the end of the rods)


CE compliant (Meets EN61326 requirements for protection against electrostatic discharge and surge.)

Operational Temperature

-10° 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 10 sensors connected to the same datalogger control port

Rod Spacing

32 mm (1.3 in.)

Ingress Protection Rating


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)


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


±(5% of reading + 0.05 dS/m)


0.5% of BEC

Relative Dielectric Permittivity


1 to 81


  • ±(3% of reading + 0.8) from 1 to 40 for solution electrical conductivity ≤ 8 dS/m

  • ±2 (from 40 to 81 for solution electrical conductivity ≤ 2.8 dS/m)


< 0.02

Volumetric Water Content


Using Topp Equation (m3/m3)


5% to 50%


±3% VWC (typical in mineral soils that have solution electrical conductivity ≤ 10 dS/m)


< 0.05%

Soil Temperature


-10° to +70°C


±0.5°C (for probe body buried in soil)





CS650 and CS655 Soil Water Content Reflectometer


CS650 and CS655 Water Content Reflectometers


CS650 (and related products) EU Declaration of Conformity

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