Soil tension sensor

1. Product introduction of soil tension sensor

Soil tension sensor is also called soil water potential meter and soil moisture detector. Soil tension sensor is suitable for places where soil moisture and drought information need to be detected. It is mostly used in agricultural crop planting to monitor whether crops are short of water, so as to better irrigate crops and chemical fertilizers. Agricultural activities such as pesticides, pesticides, and irrigation will not affect the measurement results. The growth of plants requires a certain amount of soil water, and the content of soil water has an important impact on plant growth and development. With the development of agriculture, the requirements for crop yield and quality are getting higher and higher, so it is necessary to know the precise irrigation cycle of plants and give them an irrigation time point. Soil tension sensors can give such an irrigation point. It can clearly inform growers whether plants are short of water, how long it will be short of water, and how often to irrigate, thereby improving the quality of crop products.

In modern agriculture, the role of soil tension sensors is very significant. After the soil tension sensor collects the data of the dynamic content of soil moisture in the planted crops, more precise irrigation measures can be carried out according to the growth of the crops, which can not only record the data of soil tension changes, but also help growers to continuously replenish the soil of crop types Environmental data is of great significance for improving crop varieties, improving crop quality and yield.

The product uses a transparent PVC plastic tube, which can clearly see the amount of remaining water in the equipment, which is convenient for adding water. At the same time, it uses a -100-0Kpa vacuum gauge, which is convenient for users to view the data clearly. The product is suitable for places where soil moisture and drought information need to be detected. It is mostly used in agricultural crop planting to monitor whether the crops are short of water, so as to better irrigate the crops.

When the interior of the pvc pipe of the equipment is filled with water, the pressure inside the pvc pipe is 0 compared to the atmospheric pressure. After the equipment is inserted into the soil, part of the water inside the pvc will be absorbed by the soil, resulting in negative pressure inside the pipe. The greater the absolute value of the negative pressure in a standard unit time, the stronger the water absorption capacity of the soil and the more water-deficient the soil.

2. Product Features of Soil Tension Sensor

1. Protection level: IP67

2. The structure of the whole machine: the product adopts the bottom monitoring structure, insert the bottom of the equipment into the soil to the depth that needs to be monitored, and the specific insertion depth can be customized according to the site requirements.

3. Equipment size: the insertion depth is 60cm, and an integral multiple of 15CM can be added, up to 120cm.

4. Maximum power consumption: 0.8W (24V DC power supply)

5. Equipment material: transparent PVC plastic tube, which can clearly see the amount of remaining water in the equipment, and it is convenient to add water.

6. Communication interface: RS485.

7. Power supply mode: 5-30vdc wide voltage power supply.

8. Working environment: 0℃~+60℃.

9. Default accuracy: ±0.5kpa (25°C).

10. Range: -100kpa~0kpa

11. Resolution: 0.1kpa

3. How to install the soil tension sensor

1. Installation location

Install the equipment after the crops are sown; the equipment installation location should be a relatively high and flat place to prevent rainwater from pouring back into the equipment and causing equipment short circuits or line failures.

Under the condition of comprehensive irrigation, the area with less water is preferred as the monitoring location; under the condition of partial irrigation, the wet area is selected as the monitoring location;

Select the location where the crop growth is balanced and can represent the growth of most crops;

To understand the root distribution of the monitored crops, generally choose a location closer to the water-absorbing roots of the crops to determine the height of the equipment.

2. Installation method

The installation method is perforated and grouted, please refer to the manual for details.

3. Installation method

Prepare cold boiled water: After boiling tap water for 20 minutes, let it cool for later use.

Clay head exhaust: Inject cold boiled water, fill it up, stand the instrument upright for 10-40 minutes (do not cover it), and see water dripping from the surface of the clay head, then plug the silicone plug, wrap the clay head with a paper towel to absorb water, make When the soil tension reaches about -40kpa, if you see bubbles rising, you can also shake the equipment to exhaust as much as possible. Repeat this process 2-3 times.

Submerge the clay head into the water, wait until the soil tension returns to within -10kpa, add water again to top up, plug the silicone plug, screw on the top end cap, and set aside.

4. Precautions

The clay head should be kept away from oil to avoid clogging the micropores and causing the instrument to malfunction.

The measuring range of the instrument is -100Kpa-0. When this limit is exceeded, the instrument will leak due to the rupture of the clay head tube wall, making the instrument useless.

Regularly check, fill the sensor with cold boiled water, once every half a month to a month (or add water when the water level drops to the top of the air collecting pipe), do not loosen the sensor during the filling process.

Before the temperature drops to 0°C, outdoor instruments should be withdrawn to avoid frost cracking.

-10~0kpa means humidity, which is too high for most crops.

-30~-10kpa means humid and suitable for the growth of most crops.

-50~-30kpa means dry and moisture-loving crops need to be irrigated.

<-50kpa means dry and most crops require irrigation.