Sap flow is used to measure plant and tree water use.
Available with LoRaWAN and CATM1/NB-IoT communications, as well as a Bluetooth version for direct data logging, the SFM1x Sap Flow meter is capable of measuring sap flow, reverse and very low flow rates, and (with user defined parameters) the calculation of daily, weekly, monthly and annual water use.
The SFM1x Sap Flow Meter uses the Heat Ratio Method, developed by Burgess, Adams, Turner, Beverly, Ong, Khan and Bleby (2001). A pulse of heat is provided by a heater needle located in the sapwood area, with a downstream and upstream needle that are accurately spaced to measure the heat difference over time. This measurement, combined with data on the sapwood area allows for the calculation of the sap flow. Uniquely the SFM1x can measure reverse sap flow as well, through the upstream needle.
The SFM1 Sap Flow Meter is widely used in research; below are the most recent publications that have used the Sap Flow Meter in their research.
The full list of research publications can be found here.
ICT International provide detailed manuals and installation guides, as well as the calculations used by the instruments to enable calculations to be performed on the data collected.
ICT International take pride in the quality of the science that underpins their instruments. Relying on the first principles of science, the calculations are available in Python and R scripts, and can be used to undertake detailed analysis of data.