CS650 time-domain method for soil moisture content-Global supplier

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CS650 time-domain method for soil moisture content

CS650 time-domain method, DUR reflection soil moisture sensor, provides more accurate measurement in high conductivity soil.

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CS650 is a multi parameter intelligent sensor that can monitor soilSoil volume moisture content、Volumetric conductivityandsoil temperatureIts signal output method is SDI-12, which can be used with most Campbell Scientific data collectors. If using ET107 evaporation station, please choose CS650-LC.

Product features:

1. More accurate measurement of soil moisture content, with a volumetric conductivity of up to 3 dS m-1, without the need for specific soil calibration

2. Larger collection volume reduces errors

3. Measure and correct the influence of soil texture and conductivity

4. Estimate the moisture content in soils of various mineral soil types

5. Multi functional sensors - capable of measuring dielectric constant, volumetric conductivity (EC), and soil temperature

Technical Description:

CS650 contains two 30 cm long stainless steel probes connected to a printed circuit board. The circuit board is encapsulated with epoxy resin, and the shielded cable attached to the circuit board provides connection with the data collector.

CS650 measures transmission time, signal attenuation, and temperature; Further analyze these raw measurement values to obtain the dielectric constant, volumetric water content, and volumetric conductivity.

The measured signal attenuation is used to correct the loss effect and propagation time in reflection detection. Loss effect correction allows the probe to measure high-precision volumetric moisture content in soil with a volumetric conductivity of ≤ 3 dS m-1, without the need for specific soil calibration.

Soil bulk conductivity can also be calculated from attenuation measurements. A thermistor in thermal contact with the probe near the surface of the epoxy resin is used to measure temperature. If the sensor is installed horizontally, accurate temperature measurement at the same depth as soil moisture content measurement can be obtained. If sensors are installed in other orientations, temperature measurement can only represent the area near the epoxy resin probe.

Measurements Made	Soil electrical conductivity (EC), relative dielectric permittivity, volumetric water content (VWC), soil temperature
Required Equipment	Measurement system
Soil Suitability	Long rods with large sensing volume (> 6 L) are suitable for soils with low to moderate electrical conductivity.
Sensing Volume(Detection 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.)
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	300 mm (11.8in.)
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
Electrical Conductivityconductivity
Range for Solution EC	0 to3dS/m
Range for Bulk EC	0 to3 dS/m
Accuracy	±(5% of reading + 0.05 dS/m)
Precision	0.5% of BEC
Relative Dielectric PermittivityRelative dielectric constant
Range	1 to 81
Accuracy	·±(2% of reading + 0.6) from 1 to 40 for solution EC ≤3dS/m ·±1.4(from 40 to 81 for solution EC ≤1dS/m)
Precision	< 0.02
Volumetric Water ContentVolume water content
Range	0 to 100% (with M4 command)
Water Content Accuracy	·±1% (with soil-specific calibration) where solution ·±3% (typical with factory VWC model) where solution EC <3dS/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

CS650 Time Domain Reflectance Soil Moisture Sensor. pdf

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