Diameter Dendrometer Root/Underwater : DD-RO
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Diameter Dendrometer Root/Underwater : DD-RO | Ecomatik

The DD-RO series dendrometer is used for the high-precision and continuous measurement of plant diameter changes. This device is suitable for long-term application in outdoor conditions (underground and underwater). Due to their extremely low power consumption, Ecomatik dendrometers are ideal for battery-powered solutions, e.g., in IoT applications.The DRO dendrometer is specially designed to measure roots, aquatic plants and installations with ground contact, e.g. on ground cover plants.

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The DD-RO series dendrometer is used for the high-precision and continuous measurement of plant diameter changes. This device is suitable for long-term application in outdoor conditions (underground and underwater). Due to their extremely low power consumption, Ecomatik dendrometers are ideal for battery-powered solutions, e.g., in IoT applications.The DRO dendrometer is specially designed to measure roots, aquatic plants and installations with ground contact, e.g. on ground cover plants. Sealed by a soft, yet resilient rubber coating protects the entire sensor and the sensor rod from the ingress of water and particles; the device is water- and dustproof. An additional metal bracket protects the signal-receiving sensor from pressure that may be exerted when buried under soil insubterranean installations. The specific weight of the entire device is similar to that of water. In underwater installations, the device’s buoyancy compensates for its own weight so that no additional load is exerted on the measurement tool.

Advantages of the DD-RO

  • Waterproof, suitable for subterranean, aboveground, and underwater applications
  • Low pressure at the measuring point
  • No additional load on underwater measuring objects
  • Ideal for long-term measurements

Sensor model name

Root/Underwater Dendrometer

Type DD-RO (hermetically sealed)

Scope of application

Slow/average growth rates

Suitable for diameter

0 – 2 cm (> 2 cm on request)

Special features/limitations

Sealed to withstand with a wide range of operational conditions; see below.

Measurement range

11 mm linear

Resolution

Data logger dependent e.g.:

CR300 series: 0.01 µm

Dendrometer logger DL18: 0.2 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)

Output signal

Analogue, 0V to Vex (excitation supply voltage)

Temperature drift of the sensor

<0.2 µm/°C in the whole measurement range

Linearity

<1%

Operational conditions

Hermetically Sealed Model DD-RO:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity, even under extreme environmental conditions (underwater, below snow cover, under exposure to corrosive substances e.g. salt water, ash, aggressive agricultural chemicals)

Weight (sensor without cable)

30 g

Power supply

Vex (! stabilized !) 0.5 to 10 VDC,

Power consumption max. 0.28 µWh per measurement

Material

Stainless steel and aluminium

Sensor cable length

5 m, extendable on request to max. 100 m

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