Diameter Dendrometer Small - Type DD-S2
2
3. Safety Information
The sensor is protected from rain water, but it is not waterproof. Please do not immerse
the sensor in water, or install the sensor below a longer lasting snow cover.
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
2
with shield is recommended for extensions
.
4.2 Required tools for installation and for operation
- none -
4.3 Mounting
4.3.1 Select the adequate quick-mount frame size, 0 to 2.2 cm or 1.8 to 5 cm, according to
the stem/branch diameter.
4.3.2 Attach one end of each of the two perforated rubber belts to the fixation bolts at the
back-side bar of the quick-mount frame.
4.3.3 Firmly fix the frame at the stem/branch, by tightly wrapping the rubber belts around
the stem/branch and locking them again by slipping the desired hole of each belt on
the corresponding bolt at the back-side bar.
4.3.4 Unscrew and remove the two knurled-head nuts from the dendrometer body, then
insert the screws into the slide rail of the frame and loosely screw on the knurled-
head nuts again.
4.3.5 Move the dendrometer body along the sliding rail, so that the sensor rod is pushed
in by about 2-3 mm, then 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 considerably.
4.3.6 !
! IMPORTANT !!
Fix the cable onto the tree stem/branch so that the sensor is pro-
tected from any accidental pull/ drag of the entire cable length. This can be done us-
ing a rope or cable straps. In addition, there should be no tension between the sen-
sor and cable.
Ensure that no rain water can run along the cable, or the sensor rod and enter the
sensor casing. Rod entrance, as well as wire outlet should hence always be inclined
downwards.
