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Radius Dendrometer – Type DR3
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 Tools for installation
Required:
-
cordless drill with 4 mm drill bit
-
spanner (10 mm) or adjustable spanner
-
cord to pull relieve the sensor cable
Optional:
tree resin, cable straps,
4.3 Mounting
1) Remove loose dead bark from the region/section on which the sensor is to be installed.
Ensure no injury/damage to the living tissues below the dead bark.
2) Drill one hole ( =4 mm, 3 cm deep) in 30 mm distance above, or 90° besides from the
desired measuring position.
3) Screw the special screw 3 cm into the drilled hole by using the hexagon cap nut. Op-
tionally you may dip the screw top into the tree resin before screwing them into the
trunk.
4) Screw the wingnut towards the cap nut, to open the fastening clamp and place the sen-
sor mounting hook between the two washers. Position the stem sided hexagon nut
such, that in fixed position the sensor head seats solidly on the stem surface and the
rod of the sensor is pushed in by about 2-3 mm.
Note:
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 considerably.
5) Having found the desired sensor position, lock the sensor mounting hook by firmly
screwing the wing nut down against the sensor hook.
6) 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.
2
with shield is recommended for extensions
2
.
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