Plant Physiology
ND-ISF Sap Flow Sensor
What is the ND-ISF? The ND-ISF is a heat-pulse sap flow sensor that measures the rate at which water moves up through a tree stem — a direct quantification of plant water use. Heat velocity is measured from −200 to over +1000 cm/h with 0.01 °C internal temperature resolution — ideal for plant physiology, plant water-use studies, hydraulic redistribution research, hydrology and irrigation scheduling connected to the yDoc ML-525 datalogger.
The ND-ISF is a heat-pulse sap flow sensor that measures the rate at which water moves up through a tree stem — a direct quantification of plant water use. Heat velocity is measured from −200 to over +1000 cm/h with 0.01 °C internal temperature resolution — ideal for plant physiology, plant water-use studies, hydraulic redistribution research, hydrology and irrigation scheduling connected to the yDoc ML-525 datalogger.
Key parameters
What the ND-ISF measures
Heat velocity / sap flow
−200 to > +1000 cm/h — forward and reverse flow detected
Heat-pulse temperature
–30 to +70 °C, 0.01 °C resolution, ±0.1 °C accuracy
Plant transpiration
Quantify how much water a tree actually uses
Direct integration
12 V DC powered, 5 m cable to the yDoc ML-525 over SDI-12
Specifications
Technical specifications
Applications
Where the ND-ISF is used
Plant physiology
Quantify transpiration, hydraulic conductance and stomatal regulation in research stands.
Plant water use
Whole-tree water consumption for orchard, vineyard and forest water-use studies.
Hydraulic redistribution
Detect upward and downward water movement — a key process in dryland ecosystems.
Hydrology
Catchment-scale evapotranspiration and water-balance research.
Irrigation scheduling
Match irrigation to actual plant water uptake, not just soil or weather indicators.
Integration
Powered by the yDoc ML-525 datalogger
The ND-ISF connects directly to the yDoc ML-525 datalogger. The yDoc powers the sensor, schedules measurements, stores readings locally and transmits them to the Sensor-Online platform via 4G/LTE-M, NB-IoT, LoRaWAN, satellite or Ethernet — with up to 10 years of battery life.
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FAQ
Frequently asked questions about the ND-ISF
What does the ND-ISF measure?+
How does heat-pulse sap flow work?+
Application examples?+
Ready to deploy the ND-ISF?
Get a quote, technical advice, or a complete bundle with the yDoc ML-525 datalogger and Sensor-Online platform subscription.