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Diameter Dendrometer Large – Type DD-L1
installation is taking place shortly before frost period, the sensor rod should be pushed
in by 5 mm. At frosts the stem diameter can shrink considerably.
4.3.5 Re-tighten all screws firmly.
4.3.6 Fix the cable onto the tree stem/branch by using a cord, such that the sensor is pro-
tected from any accidental pull/drag on the entire cable length. This can be done using
a rope or cable straps. Ensure there is no tension between the sensor and cable.
4.3.7 Ensure that no rain water can run along the cable into the sensor casing.
5. Wiring and Logger Configuration
The dendrometer is compatible with most data loggers. In the following we describe the
connection with Dendrometer Logger (DL18), Campbell Logger (CR1000). Please contact
us if your logger is not described here.
Dendrometer Data Logger (DL18)
The DL18 is a battery powered, waterproof logger for connecting 4 dendrometers. It is a
very effective data logger for dendrometer measurement under outdoor conditions. For
details please see the user manual of the DL18.
Campbell Data Logger (CR1000)
The dendrometer can be measured both in single-ended voltage as well as differential
voltage mode. Differential voltage mode provides better accuracy. But single-ended mode
requires half as many channels as differential mode. One CR1000 can include 16 den-
drometers in single-ended mode, but only 8 dendrometers in differential mode.
Single-ended Voltage Mode ( 2 dendrometers)
Connection
st
1
dendrometer
nd
2
dendrometer
Program Syntax
ExciteV (Vx1,2500,0)
VoltSe(SEVolt(),2,mV2500,1,True,0,_50Hz,Mult(),Offs())
If Multiplier=4.4, Offset=0, the results are measured in microns.
Cable Color
Yellow
Green
Brown
White
Yellow
Green
Brown
White
3
Input Port
1H
Ground
Vx1
Ground
1L
Ground
Vx1
Ground
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