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DR2 Radius Dendrometer
3. Safety Information
The sensor is protected from rain water, but it is not waterproof. Please do not immerse
the sensor in water.
Avoid any tension between the cable and sensor during handling and operation.
Pay attention to connections to data logger. Wrong connections will provide wrong read-
ings.
4. Installation
4.1 Cable Extension
The standard version is delivered with 5 m cable. It can be extended up to 100 m. Cable
type 4×0.25 mm
4.2 Required tools for installation
A hand-held drill with 4 mm drill bit, tree resin, cable straps, 2 spanners for M6 screw nut
(10 mm).
4.3 Mounting
Remove the dead bark from the region/section on which the sensor is to be installed. En-
sure no injury/damage to the living tissues below the dead bark.
Drill two holes ( =4 mm, max. 6 cm deep) on the left and right side and max. 5.5 cm apart
from the measuring point. Dip the screw top into the tree resin before screwing them into
the trunk. Both screws are screwed 6 cm into the holes by using the countered two nuts.
Fix the frame, with sensor attached, to the screws.
Turn the screws so that the sensor rod is pushed in by about 2-3 mm. When the installa-
tion 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.
Fix the cable onto the tree stem/branch so that the sensor is protected from any acci-
dental pull/ drag of the entire cable length. This can be done using a rope or cable straps.
In addition, there should be no tension between the sensor and cable.
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.
2
with shield is recommended for extensions
2
.
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