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Plant stem flow sensor


Plant stem flow sensor

Use: SF-G stem flow sensor is a probe instrument for measuring stem flow during the day, which was invented by French GRANIER. To calculate the stem flow during the day, the stem flow at night must be zero.  


Composed of:

· Data collector: CR1000



  Scanning rate: 100Hz

Analog input: 16 single-ended channels (8 differential)

Pulse channels: 2

Operating temperature: -25~50℃ (standard)

Memory: Standard 4M memory, expandable to 2G

Power supply voltage: 9~16VDC

A/D conversion: 13bit


AM16/32 expansion board

 The AM16/32B expansion board increases the number of sensors that the data collector can measure. The AM16/32B can be sequentially switched through four multiplex ports (COM) to measure 16 sets of 4-wire sensors (total 64 wires). In addition, the AM16/32B can be switched to 2-wire mode with a manual transfer switch to sequentially measure 32 sets of 2-wire sensors (also 64 wires in total).

Host can be connected, can connect 10 SF-L probe basic storage :4M. Other high-performance general-purpose data collection available from customers can also be used;

· Precision power adapter: can ensure that each sensor through the current is consistent, to ensure the measurement accuracy;

·SF-G stem-flow sensor: Different stem-flows produce different temperature differences, and the sensor senses the resulting tiny voltage to provide stem-flow calculation data;

How it works: Two probes are inserted into different parts of the trunk, and the upper probe is heated by the flow, and the temperature difference between the two probes is formed. As the water rises, it takes away the heat and the temperature difference between the two probes decreases. There is a functional relationship between temperature difference and stem flow. Stem flow is calculated by measuring the temperature difference.

Supporting equipment: 12V DC power supply, data collector. Constant Power Supply (CCS)


 Constant power supply (CCS) to power up to three SF-L sensors


Installation tool kit

The installation tool kit consists of:

1 hand drill

2 2mm diameter drill bits for drilling into the trunk and mounting the probe

1 8mm drill bit for isolating bark (prevents bark from interfering with probe insertion)

1 special pin to help insert the aluminum tube into the trunk

1 tube of resin to improve heat dissipation from the probe to the trunk   

Performance parameter:

 Model number




Needle length/heating wire length




 Make up 

  2Pin type



Cable length

  5m, can be extended to 20m



Suitable diameter

 Diameter >5 cm



  Power consumption

 0.2W +/-5%, 84 MA, DC




0 to 1000 microvolts



 Numerical sampling

It can be used in conjunction with general data collection.

The company provides the following supporting data 


 EL-105 data collection, DL2e data collection, Combi data 

collection, Campbell Company CR1000 data collection 

(see the data collection section)



 Power source

 12-15 volts DC







Measurement data :



  Granier A (1985): Une nouvelle méthode pour la mesure du flux de sève brute dans le tronc des

  arbres, Ann. Sci. For., 1985, 42 (2), 193-200.

  Granier A (1987): Mesure du flux de sève brute dans le tronc du Douglas par une nouvelle méthode

  thermique. Ann. Sc. For., Seichamps, 44.

  Liu J C, Firsching B M, Payer H D (1995): Untersuchungen zur Wirkung von Stoffeinträgen, Trockenheit,

  Ernährung und Ozon auf die Fichtenerkrankung am Wank in den Kalkalpen. GSFBericht

  18/95, 236 S.

  Do F and Rocheteau A (2002): Influence of natural temperature gradients on measurements of

  xylem sap flow with thermal dissipation probes. 1. Field observations and possible remedies.

  Tree Physiology 22, 641-648.

  Do F and Rocheteau A (2002): Influence of natural temperature gradients on measurements of

  xylem sap flow with thermal dissipation probes. 2. Advantages and calibration of a noncontinuous

  heating system. Tree Physiology 22, 649-654.

  Pearcy R W, Ehleringer J, Mooney H A and Rundel P W (1989): Plant Physiological Ecology –

  Field Methods and Instrumentation. Chapman and Hall.


Brand: Ecomatik