Advertisement
Radius Dendrometer – Type DR3
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 11 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.
7. Technical Specification
Name of the Sensor
Use area
Suitable for plant size
Range of the senor
Resolution
Accuracy
Temperature coefficient
of the sensor
Linearity
Environment
Weight of the sensor
Power supply
Material
Cable length
Radius dendrometer
Type DR3
For measuring radius growth of trees
Diameter > 5 cm
11 mm
The resolution of the sensor itself is infinite. The resolution of
readings is determined by connected data logger, e.g.
CR1000: 1.5 µm
Dendrometer logger DL18: 0.2 µm
Dendrometer dependent:
Max. ± 4.5% of reading (stable offset)
Dependent on the connected data logger, e.g.:
CR1000:±(0.04% of reading+4.4µm)
Dendrometer logger DL18: ±0.1%
<0.2 µm / °C in the whole range
<1%
Outdoor condition: -25 to 70C air temperature, 0 to 100% relative
air humidity
13 g without cable
Stabilized Vex 0.5 – 10 VDC, power consumption practically zero
Stainless steel and Aluminium
5 m, extendable up to 100 m
4
Advertisement
