DD-L Diameter Dendrometer Large

The DD-L series dendrometers are used for high-precision and continuous measurement of stem diameter changes. These devices are suitable for long-term application in outdoor conditions. Due to their extremely low power consumption, Ecomatik dendrometers are ideal for battery-powered solutions, e.g., in IoT applications.

DD-L dendrometers are specially designed for small- to medium-sized stems and branches (with diameters ranging from 3 to 30 cm; DD-L1W, max. 20 cm diameter). DD-L dendrometers are fixed to the measuring object with two UV-resistant elastic bands. This simple and very stable mounting method fixes the sensor at the desired measuring point without exerting excessive pressure on the trunk surface. DD-L dendrometers are available in four versions:

  1. DD-L1: with a measuring range of 11 mm for species with slow and average growth rates.
  2. DD-L2: larger measuring range of 25 mm for fast-growing species.
  3. DD-L3: larger measuring range of 50 mm for very fast-growing species.DD-L1W (previously DDW): hermetically sealed to withstand extreme environmental conditions, e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands, volcanic ash), etc. The DD-L1W is (suitable for trunk diameters between 3 and 20 cm)

Advantages

  • Suitable for small to medium stems and branches with diameters between 3 and 30 cm (DD-L1W, 3 – 20 cm)
  • Lightweight sensor
  • Injury-free installation, minimal pressure on the plant
  • Maximum stability against wind, snow, falling branches and fruit
  • Diameter-specific frame size available for diameters ranging from 3 – 30 cm

Specific to the DD-L2 & DD-L3 models

  • Extended measuring range; reduced maintenance effort (i.e. longer time interval between readjustment of the dendrometer frame) for fast-growing species

Specific to the DD-L1W model

  • Hermetically sealed to withstand extreme environmental conditions: e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands and salt, volcanic ash), etc.

Limits of the DD-L series

  • Not suitable for diameters > 30 cm (or > 20 cm DD-L1W), (see types DC and DR for diameters > 30 cm)

Specific to the DD-L1, DD-L2 & DD-L3 models

  • Not suitable for operation under extreme environmental conditions: e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands, volcanic ash), etc. (see model DD-L1W)

Models

ModelsSuitable fordiameterMeasurement range
DD-L13 - 30 cm11 mm
DD-L23 - 30 cm25 mm
DD-L33 - 20 cm50 mm
DD-L1W (hermetically sealed)3 - 20 cm11 mm

Technische Daten

Sensor model name

Diameter Dendrometer large

Types DD-L1 and DD-L1W (hermetically sealed)

Diameter Dendrometer large

Type DD-L2

Diameter Dendrometer large

Type DD-L3

Scope of application

Slow/average growth rates

Fast-growing

Very fast growing

Suitable for diameter

DD-L1: 3 – 30 cm; DD-LW: 3 – 20cm

3 – 30 cm

3 – 30 cm

Special features/limitations

DD-L1W: sealed to withstand a wide range of operational conditions, see below.

Extended measurement range, for fast-growing species

Extended measurement range, for very fast-growing species

Measurement range

11 mm linear

25.4 mm linear

50.8 mm linear

Resolution

Data logger dependent e.g.:

CR300 series: 0.01 µm

Dendrometer logger DL18: 0.2 µm

Data logger dependent e.g.:

CR300 series: 0.03 µm

Dendrometer logger DL18: 0.5 µm

Data logger dependent e.g.:

CR300 series: 0.05 µm

Dendrometer logger DL18: 1 µm

Accuracy

Dendrometer dependent: max. ± 4.5% of the measured value (stable offset)

Data logger dependent e.g.:

CR300 series: ± (0.04% of the measured value + 0.3 µm)

Dendrometer logger DL18: ± (0.1% of the measured value + 0.45 µm)

Dendrometer dependent: max. ± 1.97% of the measured value (stable offset)

Data logger dependent e.g.:

CR300 series: ± (0.04% of the measured value + 0.6 µm)

Dendrometer logger DL18: ± (0.1% of the measured value + 1 µm)

Dendrometer dependent: max. ± 0.98% of the measured value (stable offset)

Data logger dependent e.g.:

CR300 series: ± (0.04% of the measured value + 1.2 µm)

Dendrometer logger DL18: ± (0.1% of the measured value + 2 µm)

Output signal

Analogue, 0V to Vex (excitation supply voltage)

Analogue, 0V to Vex (excitation supply voltage)

Analogue, 0V to Vex (excitation supply voltage)

Temperature drift of the sensor

< 0.2 µm/°C in the whole measurement range

< 0.2 µm/°C in the whole measurement range

< 0.2 µm/°C in the whole measurement range

Linearity

< 1%

< 0.7%

< 0.5%

Operational conditions

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity;

Hermetically Sealed Model DD-L1W:

even under extreme environmental conditions (underwater, below snow cover, under exposure to strongly corrosive substances e.g. saltwater, ash, aggressive agricultural chemicals)

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity

Weight (sensor without cable)

13 g

33 g

43 g

Power supply

Vex (! stabilized !) 0.5 to 10 VDC,

Power consumption max. 0.28 µWh per measurement

Vex (! stabilized !) 0.5 to 10 VDC,

Power consumption max. 0.28 µWh per measurement

Vex (! stabilized !) 0.5 to 10 VDC,

Power consumption max. 0.28 µWh per measurement

Material

Stainless steel and aluminium

Stainless steel and aluminium

Stainless steel and aluminium

Sensor cable length

5 m, extendable on request to max. 100 m

5 m, extendable on request to max. 100 m

5 m, extendable on request to max. 100 m

Manuals

Technical data sheets

Video installation guides

DD-L
DD-L1W

Special information for integrators & developers

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Accessories & Compatible Products

Data loggers

Von klein und kompakt bis hin zum ausgebauten Messnetzwerk, Ecomatik bietet fertige Systemlösungen zur Sensordatenerfassung in jeder gewünschten Größe:
Mini-Systeme (z.B. DL18)
Maxi-Systeme (z.B. Campbell Datenlogger)

Note

Das Ausgangssignal aller Ecomatik Dendrometermodelle ist eine analoge Gleichspannung. Unsere Dendrometer sind daher kompatibel mit nahezu allen gängigen Datenloggern, und Microcontrollern mit analogen Spannungs-Eingangskanälen (z.B. auch Arduino). Bei Unsicherheiten bezüglich der Kompatibilität eines vorhandenen Datenloggers, können Sie gerne jederzeit mit uns Kontakt aufnehmen.

Contact

You need a quotation, have questions about a product, or need extensive technical advice in the context of your project planning. Starting with an initial determination of your needs, through the detailed planning of the required measurement equipment and data transmission technology, up to professional implementation on site, we are at your disposal at any time with advice and action.

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Assessment of your needs

With your consideration and input, we determine which of our products best meet your needs. We are also happy to design fully-integrated measuring stations (plant, climate, soil sensors), including an independent power supply and mobile data transmission, depending on your requirements.

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Perfect, then just write us an email! In your order, please state the diameter of your measuring objects in addition to the required cable lengths.

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Like so many things, everything started with an idea ...

In the case of the plant scientist and founder of ECOMATIK, Dr. Liu, it was the idea that modern measurement technology should enable crucial plant physiological parameters to be measured directly, precisely and with high temporal resolution on the plant itself. It was obvious to him that there is an information potential of immense value in the detailed understanding of immediate reactions of plants to their environment...