Analogical Angular Tensiometer
Main uses: Long term continuous follow up of the changes in the humidity of the soil with no need to be physically present in the field. Seeing the data from anywhere and at any time using a variety of apparatuses, like a computer, smartphone, tablet, and the like. The possibility to activate irrigation automatically in accordance with the condition of the humidity of the soil. Of course, the options of the use depend also on the model and the manufacturer of the various control and monitoring systems in the market. The analogue tensiometer of Ami Tens sends a standard output (4-20 mA or 0-2 V).
מבנה המכשיר ועקרון הפעולה
The analogical tensiometer is made up of a plastic tube with a transparent part in its upper segment, whereas a porous ceramic dome is connected to its bottom end. Below the transparent little window is screwed in an analogic vacuum transducer, and on the uppermost end of the tube there is a cap that screws in in order to fill in water.
The analogical vacuum transducer: The body of the transducer is a cylinder of stainless steel having a length of 6 or 4 cm and a diameter of 2 cm which is screwed into the body of the tensiometer with a G ¼” thread. In order to fill in or add water it is necessary to remove the cap manually and to close it using force at the end of the procedure. The ceramic is inserted into the area of the roots whereas its outside is in close contact with the soil and its inside is in contact with the water in the tube. The dryer is the soil, the greater will be the tension of the water (sub-pressure) inside the tube and we read the data. The vacuum meter indicates the tension in units of negative pressure, that is, millibars (for light soil) in the following values: 0 -- for saturated soil, up to 250 -- for totally dry soil, or centibars (for heavy/medium soil) in the values: 0 -- for saturated soil, up to 100 -- for totally dry soil. After irrigating or rain, the tension of the water will decrease. By following up continuously the farmer can decide when and how much to irrigate in the most efficient manner.
Optional Technical Specification
Since an angular tensiometer is inserted laterally into the container in which the plant is planted, the length of the tube after the angle is fixed and stands at 20 cm. All what you have to choose is the length of the ceramic (6 or 12 cm) in accordance with the type of substrate, the scope of the measurement of the transducer (0 to 100 centibars, or 0 to 250 millibars) in accordance with the pace at which the substrate gets dry and the output voltage of the transducer in accordance with the irrigation controller being used.
General Comments
- You have to read the directives regarding the location and the use of the data in the Chapter on tensiometers in general. It is important to point out that, when using an analogical tensiometer, great importance is attached to choosing a transductor that has an electrical output that is suitable for controlling the irrigation, which you will be using, (unless you acquire, in favor of the tensiometers, a dedicated controller that will be placed together with the tensiometers) in order to be able to interface with it and to document changes and tendencies
- It is also possible to provide analogical tensiometers with different characteristics, such as: Scope of measurement 0-60 centibars, depths that are different from the standard and the like. In order to receive an offer for a product with a unique characteristic, you have to submit a request to the Company and we will make an offer accordingly.