Soil salinity conductivity EC integrated sensor for smart agriculture Low cost RS485/4-20mA

Soil salinity conductivity integrated sensor Product introduction：

◆It has the function of simultaneous detection of soil salinity and electrical conductivity;

◆Simple structure, stable performance and convenient operation;

◆Using advanced ceramic technology, directly buried in the soil, maintenance-free;

◆High integration, small size, low power consumption, easy to carry;

◆Real realization of low cost, low price and high performance;

◆Long life, convenience and high reliability;

◆Support secondary development;

This product is suitable for agricultural irrigation, flower gardening, grassland pastures, soil rapid testing, plant cultivation, scientific experiments and other fields. It can also be used for anti-corrosion monitoring of underground oil and gas pipelines and other pipelines.

Soil salinity conductivity integrated sensor Technical Parameters：                                  

Salt measurement range: 0～8000mg/L

Resolution: 1mg/L

Accuracy: ±5%

EC measurement range: 0~15 mS/cm

Resolution: 0.01 mS/cm

Accuracy: ±5%

Power supply mode:  DC 12V-24V

Output form:   0~5V/4~20mA/RS485

Working environment: 

Temperature: -10℃～60℃

Humidity: 0~95%RH

Shell material: waterproof plastic shell

Transmitter size: 80*60*33mm

Wire the sensor according to the instructions in the wiring method, and try to place the sensor in a place with low terrain, close to the water source, or a place with relatively moist soil.

There are two methods for field installation: excavation section and ground drilling.

1. The excavation section turns darkly

Dig a soil profile where the sensor needs to be buried, and determine the position and depth of the sensor on the profile. From bottom to top, use a small earth borrower with the same (or slightly larger) outer diameter as the sensor, and dig out a horizontal depth of about 10- 20 cm soil hole, insert the sensor horizontally to the bottom of the hole, and then fill it with soil and compact it. Make sure that the ceramic element of the sensor probe is in close contact with the soil. It is best to lead the sensor wire away from the vertical section at a certain distance to the ground, so as to avoid rainwater flowing directly around the sensor along the wire and affecting the authenticity of the test results. The plugs of several sensors embedded in a section are fixed on a simple bracket in sequence. And wrap it in a plastic bag to prevent soil particles and rainwater from entering, after the sensor is buried. Backfill and compact the profile pit according to the original soil layer order and bulk density, and keep the ground cover the same as the original.

2. Ground drilling installation

In the place where the sensor needs to be installed, use a soil extractor (Luoyang shovel, twist soil drill or special soil extractor) to drill a soil hole from the ground down to a predetermined depth, and use a thin rod with an open end to support the sensor to the bottom of the hole, so that It is in close contact with the soil, and the thin rod is slowly pulled out. Then backfill and compact in layers.

Corresponding to the embedded sensor, a set of soil moisture tension meters can be embedded at the same time about 20 cm away from the sensor to observe the change of soil moisture.

After the installation is completed, turn on the power supply and the switch of the collector, wait for a period of time to make the salt solution reach equilibrium, and then the soil salinity at the measurement point can be obtained.

Total salt in soil is an expression of the total amount of salts contained in the soil. Since the various salts in the soil leachate are generally present in the form of ions, the total salt content can also be expressed as the sum of the amount of various cations and the amount of various anions in the soil leachate.

A common indicator used in describing the salt status of soils is the soil leachate conductivity. In soil analysis, salt content is an important comprehensive indicator, and the determination of conductivity in soil can directly reflect the mixed salt content. This means that the greater the soil salinity, the greater the soil conductivity.

EC value reference standard

The EC value is expressed in mS/cm or μs/cm, and the measurement temperature is usually 25°C.

The EC value for general irrigation water is required to be less than 0.8ms/cm. The ideal EC value for plant growth is usually between 0.2~0.6ms/cm and should not exceed 2.5ms/cm at the highest.

The conversion relationship between ds/m and ms/cm in electrical conductivity:

1S/m=10dS/m=1000mS/m=1000000μS/m=10mS/cm=10000μS/cm that is 1dS/m=1mS/cm

Soil EC values suitable for crop growth

The soil EC value is a response to the magnitude of salinity in the soil through electrical conductivity and indirectly reflects the soil fertility. Too high or too low soil EC will hinder the growth of crops. Different plants have different soil EC suitable for different fertilization characteristics and growth stages, so please take the actual plant growth conditions as reference.

In the same area, in general, the higher we test the soil EC, the higher the salinity. If the salt content is too high for a long time it will poison the plants, and some plants are sensitive to the salt content.