Adjustment And Maintenance; Technical Specifications - Ecomatik DD-S2 User Manual

Diameter Dendrometer Small - Type DD-S2

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 plant, the sensor should be reset after some months
or years of measurements. When the output approaches 11 mm, the sensor needs to be
reset.
To do so, relax the knurled-head screws and move the sensor body slowly along the slide
rail, until the sensor rod is pushed out completely. Then slowly move the dendrometer
body along the sliding rail in the opposite direction, until the sensor rod is pushed in again
by about 2-3 mm and lock the dendrometer at the desired position by firmly tightening the
two knurled-head nuts. When the 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 consid-
erably.

7. Technical Specifications

Name of the Sensor
Use area
Suitable for plant
size
Range of the senor
Resolution
Accuracy
Temperature coeffi-
cient of the sensor
Linearity
Environment
Weight of the sensor 15 g without cable
Power supply
Material
Cable length
Diameter dendrometer small
Type DD-S2, fast mounting frame for toolless installation
For measuring diameter growth of plants
Diameter 0-5 cm (>5 cm on request)
Suitable for small plants such as trees, wheat, corn.
11 mm
The resolution of the sensor itself is infinite. The resolution of
readings is determined by connected data logger, e.g.:
CR1000 (differential w/i): 1.5 µm
Dendrometer logger DL18: 0.2 µm
Dendrometer dependent:
Max. ±4.5% of reading (stable offset)
Logger dependent, e.g.:
CR1000: ± (0.04% of reading +4.4 µm)
Dendrometer logger DL18: ±0.1%
<0.2 µm / °C in the whole range
<1%
Outdoor condition: -25 to 70C air temperature, 0 to 100%
relative air humidity
Stabilized Vex of 0.5 – 10 VDC, power consumption practi-
cally zero
Stainless steel and Aluminium
5 m, extendable up to 100 m
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