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Reference: UA-002-64

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VH400 Soil Moisture Sensor Probe Specifications Power consumption: < 13mA Supply Voltage: 3.5V to 20 VDC. Dimensions See drawing. Power on to Output stable: 400 ms Output Impedance: 10K ohms Operational Temperature: -40ºC to 85ºC Accuracy at 25°C: 2% Output: 0 to 3V related to moisture content Shell Color: Red Voltage Output Curves: Curves, Piecewise...
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SF-L -Granier Sap Flow Sensors MYJ
  • SF-L -Granier Sap Flow Sensors MYJ
  • SF-L -Granier Sap Flow Sensors MYJ

SF-L -Granier Sap Flow Sensors

SF-L

SF-L -Granier Sap Flow Sensors

Our four-needle SF-L sensor is an updated Granier sensor. The patented improvements correct the naturally occurring and time-varying vertical temperature gradients in the sapwood. Without correction (i.e. the original Granier sensor, SF-G) and despite isolation, these natural temperature gradients can lead to a temporary over- or underestimation of the measured sap flow values of up to 50% in extreme cases (cf. Do, F., & Rocheteau, A., 2002). Additional temperature measurements with the SF-L sensor enable a correction of the measured sap flow values, which prevents errors caused by the natural vertical stem temperature gradients. This results in a significantly higher accuracy and a stabler zero-point (ΔTmax) of the xylem (sap) flow.

CHOOSE MODEL
Description

A very helpful option to exactly determine this zero-point would be to use a dendrometer in order to continuously measure the water saturation level of the tree body. This additional measurement allows for a precise determination of zero sap flow conditions: sap flow = 0 if the relative humidity in the crown at 100% and the tree body is 100% saturated with water (no change in diameter according to the dendrometer data). The improved SF-L sensor combined with dendrometer-aided precise determination of zero flow conditions, makes a running nocturnal zeroing of the sap flow (according to Granier) unnecessary. This process enables the recording of a nocturnal xylem flow.

Advantages

Specific to the SF-G model

  • Suitable for tree diameters > 1 cm

Specific to the SF-L model

  • Greater measurement accuracy
  • Correct determination of the xylem flow zero point when supplemented with dendrometer measurements
  • Allows measurement of nocturnal xylem flow
  • Additional information about tree growth provided by installing supplementary dendrometers


Limits

Specific to the SF-G model

  • The measured values are superimposed by naturally occurring vertical temperature fluctuations in the trunk (up to +/- 2.5 ° C). This leads to measurement errors greater than 50% and may impact the reliability of measurement results.
       
  • Nocturnal sap flow cannot be measured. Because of the temperature overlaps, nocturnal measurement values have to be set to zero.

Specific to the SF-L model

  • Not suitable for trees with a diameter < 8 cm
  • 3 logger channels are required per sensor

Technical Data

Sensor model name
    

Sap Flow Sensor
Type SF-G
Type SF-G

Scope of application
For continuous measurement of the sap flow in wood plants

Suitable for diameter   
> 1 cm
> 8 cm

Number of sensor needles
2 
4

Sensor dimensions
Needle diameter: 1.5 mm;

Needle length//length heated in mm, available versions:
18//10; 33//20; 43//20; 63//20

Output signal
Analog, DC voltage -100µV to +800 µV

Required logger channels
1x differential, resolution better than 10 µV
3x differential, resolution better than 10 µV

Power supply
Sap flow sensors must be supplied via a constant current source (CCS). A CCS supplies up to 3 SF-G and / or SF-L sensors and continuously needs 85 mA x 12 V. This corresponds to 2.1 amps x hour / day.

Sensor cable length
5 m, extendable to max. 20 m

Product Details
SF-L
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