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Sap Flow Sensor type SF-L


Sap Flow Sensor type SF-L

The SF-L sensor is an improved Granier sensor. The improvements are:

■ Correction of measurement errors due to vertical temperature gradient of tree trunk: the vertical trunk temperature is measured separately and subtracted from the data of sap flow. In this way the sap flow is measured more accurately, and the zero-point of sap flow remains stable for a long time.

■ Continuous determination of water-saturation level of the tree body with a Dendrometer

■ New definition of zero sap flow: sap flow = 0 when the relative humidity in the crown => 100%, and the tree body is saturated with water (indicated by the dendrometer curve)



■ Significant higher accuracy

■ Correct identification of zero sap flow

■ Correct Measurement of sap flow in night time

■ Additional data on tree growth measured by dendrometer

■ Reusable sensor



■ Not suitable for trees with diameters <15 cm


Available Models

■ SF-L 20/33, depth of installation 20-33 mm

■ SF-L 20/43, depth of installation 20-43 mm

■ SF-L 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-L sensors)

■ Installation tools

■ Data Logger


Technical data

NameSap Flow Sensor Type SF-L
Needle sizeDiameterr 1.5 mm, Length 33, 43, 63 mm
Cable length5 m, extendable to 20 m
Suitable for tree sizeDiameter> 15 cm
Power supplyA CCS supplies up to 3 sensors and consumes 1 W (12 V x 84 mA DC, stabilized)
Output0 μV bis 1000 μV DC

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