CS650-L soil moisture sensor

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CS650 is a multi-parameter smart sensor that uses innovative technology to monitor soil volumetric water content, conductivity, and temperature. Output SDI-12 signal, compatible with various data collectors.

Features:
More accurate measurement of soil water content, conductivity is accurate to 3 dS m-1 without special soil calibration;
Large sample size reduces errors;
Automatic correction of measurement data (when the soil texture and conductivity change);
Suitable for a variety of mineral soils;
Multifunctional probe: can measure dielectric constant, electrical conductivity (EC), and soil temperature.

CS650-L soil moisture sensor


Technical principle:
CS650 consists of two 30-cm long stainless steel probes, printed circuit board, and shielded cable. The circuit board is sealed in epoxy resin, and the shielded cable is used to connect the circuit board and the data collector. The CS650 directly measures the conduction time, signal attenuation and temperature; the dielectric constant, volumetric water content and conductivity are derived from these original values. The measured signal attenuation is used to correct the loss effect in reflection detection, thereby obtaining accurate conduction time. This loss effect correction can make the water content measurement reach EC≤3 dS m-1 without special soil calibration. The conductivity of the soil is also calculated from the attenuation measurement. The thermistor and the probe are in thermal contact with the epoxy resin surface to measure the temperature. As with measuring water content, horizontally mounted probes provide accurate soil temperature measurement at the same depth. Temperature measurements in other directions are passed into the epoxy resin through probes in the area.

specification:
Sensing volume: 7800 cm3 (0 to 7.5 cm radius around the probe and 4.5 cm below the probe tip);
Electromagnetic type: meets CE standards, EN61326 requirements, anti-static discharge protection;
Operating temperature: -10° to +70°C; probe length: 300mm (11.8 in.)
Probe diameter: 3.2 mm (0.13 in.)
Probe spacing: 32 mm (1.3 in.)
Probe size (H*W*D): 85 mm (3.3 in.)* 63 mm (2.5 in.)* 18 mm (0.7 in.)
Sensor weight: 280 g (9.9 oz.) (without cable);
Cable weight: 35g/m (0.38 oz. per ft);
Sensor output: SDI-12; serial RS-232;
Warm-up time: 3s;
Measurement time: 3 ms measurement, 600 ms to complete the execution command;
Power supply: 6 to 18 VDC, must meet 45 mA @ 12 Vdc;

Power loss:
Dynamic (3 ms): 45 mA typical @ 12 Vdc
(80 mA @ 6 Vdc, 35 mA @ 18 Vdc)
Static: Standard 135 µA @ 12 Vdc

Conductivity:
Measuring range: (0 to 3) dS/m
Accuracy: ±(5% reading + 0.05dS/m);
Accuracy: 0.5% of BEC;

Relative permittivity:
Range: 1 to 81;
Accuracy: (1 to 40): ±(2% of reading + 0.6) solution EC ≤3 dS/m)
(40 to 81 ): ±1.4 solution EC ≤1.0 dS/m
Accuracy: <0.02;

Volumetric water content (Topp equation m3/m3):
Range: 5% to 50%;
Accuracy: ±3% VWC (standard mineral soil), solution EC ≤3 dS/m;
Accuracy: <0.05%

Soil temperature:
Range: -10° to + 70°C;
Accuracy: ±0.5°C (buried in soil);
Accuracy: ±0.02°C

Origin: United States

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