Thermal Diffusion (TDP) Plant Stem Sap Flow Monitoring System Sap Flow Meter Plant Stem Sap Flow Tester

Descripción

Introducción
The Thermal Diffusion (TDP) Plant Stem Sap Flow Monitoring System is designed based on the Granier sap flow measurement principle. It comprises two probe configurations: a two-needle type and a three-needle type. The two-needle configuration consists of two probes, with the upper probe incorporating a heating element; the three-needle configuration consists of three probes, with the central probe incorporating a heating element. The heating probe utilizes constant-power heating, while thermocouples are employed to measure the temperature difference between the upper and lower probes. A data acquisition system—integrated with a wireless transmission module—automatically collects data and periodically transmits it to a data center. By applying the principles of thermal diffusion and empirical coefficients, the system calculates the plant stem sap flow rate, thereby reflecting the plant’s transpiration and water consumption status. Además, the three-needle configuration is capable of measuring reverse sap flow.
The wrap-around plant sap flow monitoring system is designed based on the principles of the heat balance method. By measuring the energy balance relationship—specifically, the input heat relative to the heat conducted radially, upward, and downward along the stem, as well as the heat carried by the sap flow—the system calculates the plant’s stem sap flow rate, thereby reflecting the plant’s transpiration and water consumption status. This system is suitable for measuring sap flow in slender-stemmed trees or herbaceous plants.

Key Features
1. Designed based on the Granier principle, allowing for direct data analysis and processing using the calculation formulas recommended by Granier;
2. Supports intermittent heating, thereby minimizing damage to the tree and reducing the instrument’s power consumption during operation;
3. Easy system installation, with simple operation for both hardware and software;
4. Features an exclusively developed 5mm micro-probe, making it possible to measure sap flow in slender stems;
5. Utilizes a three-needle sensor configuration to capture both the absolute temperature of the tree and the direction of sap flow;
6. The TDP probe features a diameter of just 1.2mm, ensuring minimal impact on the tree when inserted;
7. The system is equipped with an LCD screen and supports user-configurable data storage intervals ranging from 1 second to 60 minutos;
8. Supports the optional addition of multiple sensors as needed; the system can accommodate up to 48 TDP sensors simultaneously;
9. Offers dual interface options (USB and RS232) and supports various wireless network communication functions, including GPRS.