Supported sensors


Sap Flow Tool can perform sap flow calculations on data from sensors based on two measurement principles:

  • HRM (Heat Ratio Method) sensors
    • SVP (Sap Velocity Probe): 1st generation ICT International HRM sensor
    • HRM-SFM (HRM Sap Flow Meter): 2nd generation ICT International HRM sensor

  • HFD (Heat Field Deformation) sensors
    • HFD (Heat Field Deformation): 1st generation ICT International HFD sensor
    • HFD-SFM (HFD Sap Flow Meter): 2nd generation ICT International HFD sensor

Sap Flow Tool is also able to import and visualise data from any other sensor or measurement device (even non-ICT International data).


SFM sensor

HRM-method

The Heat Ratio Method (HRM) is a modification of the Compensation Heat Pulse Method (CHPM). The HRM improves on the CHPM by allowing very slow flow rates and even reverse sap flow to be measured. This allows water flows to be monitored in stems and roots of a wide range of different species, sizes and environmental conditions, including drought.

Developed by the University of Western Australia and partner organisations, ICRAF and CSIRO, the HRM sensor has been validated against gravimetric measurements of transpiration and used in published sapflow research since 1998. Burgess, S.S.O., et.al. 2001 "An improved heat pulse method to measure low and reverse rates of sapflow in woody plants", Tree Physiology 21, 589-598.

For more detailed information click here.

HFD sensor

HFD-method

The Heat Field Deformation (HFD) technique is ideally suited to sapflow research projects that require the measurement of extended radial sapflow profiles to accurately map hydraulic architecture of trees.

Similar to the HRM sap flow sensor the HFD sensor can measure high sapflow rates as well as low to zero and reverse sapflow. Hence as both sensors can measure in the same range the HFD sensor provides an extension of the HRM method making both sensors highly complimentary to each other in most sapflow measurement applications.

For more detailed information click here.


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