Diameter Dendrometer Large
– Type DD-L2
4
6. Adjustment and maintenance
Ensure that no falling branches, fruits or snow land on the sensor. The sensor is protected
against water droplets but is not waterproof.
When the sensor is correctly installed, it will function under outdoor conditions without the
need for further maintenance.
Depending on the growth rate of the tree, the sensor should be reset after some months
or years of measurements. When the output approaches 25 mm, the sensor needs to be
reset.
Relax the screw slowly so that the sensor rod is pushed in by about 2-3 mm. When the
reset 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.
Tighten all screws firmly.
7. Technical Specifications
Name of the Sensor
Diameter dendrometer large
Type DD-L2
Use area
For measuring diameter growth fast growing of trees
Suitable for plant size
Diameter 3-30 cm
Range of the senor
25.4 mm
Resolution
The resolution of the sensor itself is infinite. The resolution of
readings is determined by connected data logger, e.g.
CR1000: 3.3 µm
Dendrometer logger DL18: 0.5 µm
Accuracy
Dendrometer dependent:
Max. ±1.97% of reading (stable offset)
Dependent on the connected data logger, e.g.:
CR1000:±(0.04% of 10µm)
Dendrometer logger DL18: ±0.1%
Temperature coeffi-
cient of the sensor
<0.2 µm / °C in the whole range
Linearity
<0.7%
Environment
Outdoor condition: -25 to 70
C air temperature, 0 to 100% relative
air humidity
Weight of the sensor
33 g without cable
Power supply
Stabilized Vex 0.5
– 10 VDC, power consumption practically zero
Material
Stainless steel and Aluminium
Cable length
5 m, extendable up to 100 m
