CS650-LC

30 cm Water Content Reflectometer for ET107 Stations
CS650-LC

CS650-LC

Orderable

30 cm Water Content Reflectometer for ET107 Stations

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Model:
CS650-LC
Item Number:
45053
Warranty:
1 year

Overview

The CS650-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 CS650 sensor instead.

Technical Description

The CS650-LC consists of two 30-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 CS650-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 ≤3 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
7800 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
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)

Probe Weight
280 g

(9.9 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 3 dS/m
Range for Bulk EC
0 to 3 dS/m
Accuracy
±(5% of reading + 0.05 dS/m)
Precision
0.5% of BEC

Relative Dielectric Permittivity

Range
1 to 81
Accuracy
±(2% of reading + 0.6)

for solution EC ≤ 3 dS/m (for 1 to 40 range)

±1.4

(for solution EC ≤1.0 dS/m) for 40 to 81 range

Precision
< 0.02

Volumetric Water Content

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

(typical in mineral soils, where solution EC ≤ 3 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

Similar Products

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Compatibility

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 CS650-LC 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.

Installation Tools

14384 Pilot Tool

The 14384 Pilot Tool has rods with similar diameters and the same spacing as the probe. The tool can be driven into the soil using force levels that might damage the probe. After removing the 14384, the probe is inserted into the established holes.

14383 Installation Tool

The 14383 Installation Tool can be used to help maintain the proper spacing and parallel orientation of rods during insertion. Use of the 14383 may reduce measurement errors by minimizing soil disturbance.

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