Band dendrometer DR26/DRS26/DRL26

Plants Dendrometers

Band dendrometer DR26/DRS26/DRL26

Art.-Nr.: 1701044 (DR26) Item no.: 1701049 (DRS26 - with SDI-12) Item no.: 1701041 (DRL26 - with data logger)

Advantages at a glance

Autonomous individual measurement instrument
No central logger is required
Continuous data series
No upper limit for the stem diameter

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Band dendrometer DR26/DRS26/DRL26

Plants Dendrometers

Product description

Band Dendrometers for Monitoring Tree Growth

Band dendrometers enable continuous, non-invasive monitoring of changes in stem circumference and, consequently, tree growth. In addition to long-term growth, short-term fluctuations in stem tissue can be detected, for example in response to diurnal or microclimatic changes. High-resolution measurements provide detailed insights into tree growth dynamics and water use.

The DR26 series dendrometers use a rotary position sensor and enable stepless measurement of changes in stem circumference. Their simple, non-invasive attachment allows individual trees to be monitored even across large study areas. Dendrometer data can, for example, be combined with sap flow measurements to investigate relationships between stem growth, water use and environmental conditions.

Three variants for different measurement concepts

The DR26 series is available in three versions:

DR26 – analog: Analog voltage output for connection to an external data logger.
DRL26 – with integrated data logger: Autonomous data storage directly on the dendrometer. The integrated lithium battery enables independent operation without an external power supply or solar panel. Data transfer and configuration are carried out via an infrared interface.
DRS26 – with SDI-12 output: Digital data transmission via the standardized SDI-12 interface for connection to an external data logger.

This allows the appropriate dendrometer to be selected according to the desired data acquisition, power supply and integration into an existing monitoring system.

Technical data

Parameters	Specifications
	DR26 – analog	DRL26 – with data logger	DRS26 – with SDI12
Dimensions (L × W × H)	100 x 70 x 100 mm
Weight	~350 g
Housing protection class	IP 63
Sensor
Sensor type	Rotary position sensor
Measurement range (change in circumference)	65 mm
Minimum diameter of trunk	8 … ∞ cm (optionally 4 … 8 cm with base plate upgrade)
Linearity	±1% of full scale
Resolution	stepless	<1 μm	1 μm
Reading	stepless
Internal temperature measurement accuracy		±0.3 °C	±0.2 °C (within -10... +40 °C)
Power supply
Battery		Lithium LS14250CN 3.6 V; 1000 mAh
Battery life at 1-hour intervals		approx. 5 years
Supply voltage	5.5 … 16 V		5.5 … 16 V
Supply current	1 mA
Current consumption idle			20 μA
Current consumption when measuring			6 mA
Warm-up time			300 ms
Connection / Communication
Connector	Four wire M8 connector male	Fully enclosed dendrometer housing without a connector	Three wire Escha M8 connector male
Cable length	10 m (custom lengths available upon request)	no cable	2 m, 5 m, 10 m (custom lengths available upon request)
Communication / Output	Analog output: accuracy in accordance with the data logger's specifications Output Signal 0 bis 2500 mV Sensitivity 0.0256 mm/mV	Data transfer: Wireless infrared transmission special USB/infrared data transfer cable	Communication: digital: SDI-12 version 1.3 compatible SDI-12 cable: M8 female connector for the dendrometer; three wires to the data logger: brown = +Vcc, black = data, blue = -Vcc
Data logger
Features	Depending on the data logger used	measuring and storing interval 5 min … 4 h storage capacity ca. 100,000 values Internal clock accuracy (-10 to 40 °C) better than ±15 seconds per month	Depending on the data logger used
Environmental Conditions
Operating temperature	-40 … 60 °C
Air humidity	0 … 100 %
Stainless steel tape
Tape length	20 m
Tape width and thickness	12 x 0.2 mm
Tension force	15 to 20 N in the entire area
Tape temperature coefficient	16 µm/(m·K)

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