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Soil tensiometer (soil water potential sensor)
The suction value of soil water potential is usually manually read using a soil tension gauge vacuum gauge or a mercury column in a U-shaped glass tub
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1、 Performance and Features
The suction value of soil water potential is usually manually read using a soil tension gauge vacuum gauge or a mercury column in a U-shaped glass tube. Obviously, such a soil tensiometer cannot continuously record the dynamic changes in soil moisture. The piezoelectric soil tensiometer can convert the measured soil suction value into a voltage signal output, which can continuously record the process of soil water potential changes. This provides researchers with dynamic data on soil water potential in the field, which can be used for soil moisture model experiments, soil water holding curves, and permeability measurements, saving a lot of measurement and reading time. The HYC-02 piezoelectric soil tensiometer uses a voltage signal to be input into a microcomputer through an A/D converter and interface circuit for data processing, as a database or for complex numerical operations. It is connected to the irrigation system to achieve a closed-loop automatic irrigation system controlled by a microcomputer. This instrument is a new type of instrument developed based on the HYC-01 vacuum gauge type tensiometer. The function of automatically and continuously recording soil suction data has been achieved by using piezoelectric sensors instead of vacuum gauges and automatic data acquisition systems instead of manual observation. The HYC-02 piezoelectric soil tensiometer has the function of in-situ water replenishment, and can also drain the remaining water in the tensiometer when it is not in use in winter to prevent frost cracking and damage. 2、 Principle and Structure Diagram The piezoelectric soil tensiometer consists of components such as a clay head and a piezoresistive sensor. Ceramic head: It is the sensing component of an instrument, with many small pores. After the ceramic head is wetted by water, a water film is formed in the pores. When a sealed soil moisture meter filled with water is inserted into unsaturated soil, the water film is connected to the soil water, creating negative pressure inside the instrument. Pressure resistance sensor: converts negative pressure values into 485 electrical signals for output. The instrument has the advantages of simple structure, high sensitivity, and easy use. It can continuously measure soil moisture suction at fixed points and reflect the dynamic changes of soil moisture in a timely manner. Provide necessary scientific basis for irrigation, drainage, and regulation of crop growth. 3、 Characteristics and technical parameters of piezoelectric soil tensiometer: The pressure sensor module used in an instrument has the following characteristics: The XGZP pressure sensor module adopts a DP packaging form, with a pressure sensor as the sensing element and integrated with a digital conditioning chip. The two sides of the PCB board are respectively equipped with S0P packaged pressure sensors and signal processing circuit chips, which digitally compensate for the sensor's offset, sensitivity, temperature drift, and non-linearity. With the supply voltage as a reference, a calibrated and temperature compensated standard voltage signal is generated. Two technical parameters Measurement range: 0-100Kpa Output signal: 0.5-4.5V Supply voltage: 5 ± 0.25V DC Maximum operating current: 3mA Measurement accuracy: ± 1.0% Span Zero drift: ± 0.03% FS/℃ Full range drift: ± 0.03% FS/℃ Long term stability (1 year): ± 1.0% Span Overload pressure: 3X Rated (range ≤ 500 Kpa) Compensation temperature: -10 ℃~+85 ℃ Working temperature: -20 ℃~+100 ℃ Storage temperature: -40 ℃~+125 ℃ Sealing grade: IP65 Outgoing method (signal interface): four core shielded wire, four core aviation connector Wiring: 1 power supply DC5 ± 0.25V (+) - red wire 2 Power Supply DC5 ± 0.25V (--) - Black 3 signal output RS485 (A) - yellow 4 signal output RS485 (B) - blue.
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