Sap Flow Sensor type SF-G

The SF-G sensor is the typical Granier sensor and consists of two needles


  • Suitable for tree diameter >2 cm
  • Reusable sensor


  • Temperature difference between the needles is superimposed by natural vertical temperature gradients within the sap wood (up to + / -2.5 ° C). This occasionally leads to unpredictable errors of over 50% in sap flow calculations.
  • Sap flow at night cannot be measured. Due to unpredictable temperature overlays, night values are wrongly set to zero.

Available Models

  • SF-G 20/33, depth of installation 20-33 mm
  • SF-G 20/43, depth of installation 20-43 mm
  • SF-G 20/63, depth of installation 20-63 mm

Delivery by Standard Version

  • Sensor with 5 cable, weatherproof cap, Aluminium tubes

Options / Ordering Information

  • Cable extension (please specify in meters, but max. 20 m)
  • CCS power supply (one CCS is enough for up to 3 SF-G sensors)
  • Installation tools
  • Data Logger

Sap Flow Sensor type SF-G

Technical data

Name Sap Flow Sensor Type SF-G
Needle size Diameterr 1.5 mm, Length 33, 43, 63 mm
Cable length 5 m, extendable to 20 m
Suitable for tree size Diameter> 2 cm
Power supply A CCS supplies up to 3 sensors and consumes 1 W (12 V x 84 mA DC, stabilized)
Output 0 µV bis 1000 µV DC