CS655-LC

12 cm Water Content Reflectometer for ET107
CS655-LC

CS655-LC

RetiredConfigurable

12 cm Water Content Reflectometer for ET107

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Model:
CS655-LC
Item Number:
28379
Warranty:
1 year
Lead time:
14 days

Overview

CS655-LC 12cm Water Content Reflectometer Plus for ET or MetData1

The CS655-LC is a multiparameter smart sensor that uses innovative techniques to monitor soil volumetric-water content, bulk electrical conductivity, and temperature. This sensor is used with the ET107 Weather Station.

Note: The cable connector for this sensor is suitable for use with an ET107 station. For other cable termination options, use the CS655 sensor instead.

Technical Description

The CS655-LC 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-LC 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.

Specifications

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.)

Operational Temperature
-10° to +70°C
Sensor Output
SDI-12; serial RS-232
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 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 electrical conductivity ≤ 8 dS/m

Accuracy
±2

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

Precision
< 0.02

Volumetric Water Content

-NOTE-
Using Topp Equation (m3/m3)
Range
5% to 50%
Accuracy
±3% VWC

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

Precision
< 0.05%

Soil Temperature

Range
-10° to +70°C
Accuracy
±0.5°C

(for probe body buried in soil)

Precision
±0.02°C

Related Resources

Documents

Videos and Tutorials

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Phone Numbers
General: (435) 227-9000
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Corporate Address
815 W 1800 N
Logan, UT 84321
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Email Address
sales@campbellsci.com

As a trusted leader in measurement systems for more than 50 years, our top priority at Campbell Scientific has always been to provide the most accurate, reliable data for research and industry.