DD-RO Diameter Dendrometer Root/Underwater

    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

    Limits of the DD-RO dendrometer

    • Only suitable for diameters smaller than 2 cm (for root diameters> 2 cm on request)

    Models

    ModelsSuitable fordiameterMeasurement range
    DD-RO0 – 2 cm (> 2 cm auf Anfrage)11 mm

    Technical data

    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 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

    Analog: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Data logging

    Flexible options for data logging & transmission:

    1. Data logger, manual readout (analog or SDI-12, e.g. DL18 or CR350)
    2. LoRaWAN, wireless data transmission (analog, e.g. IoP-S-LA)
    3. NB-IoT, wireless data transmission (analog, e.g. IoP-S-NA, IoP-S-LTEMA)

    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

    Manuals

    DD-RO

    DD-RO(226.9 kB)

    Technical data sheets

    DD-RO

    DD-RO(355.2 kB)

    Special information for integrators & developers

    Dendrometer to datalogger

    Dendrometer to datalogger(94.8 kB)

    Dendrometer cable wire assignment

    Dendrometer cable wire assignment(123.1 kB)

    Dendrometer temperature sensitivity test

    Dendrometer temperature sensitivity test(540.4 kB)

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    Accessories & Compatible Products

    Data logging

    From small and compact solutions to fully developed measurement networks, Ecomatik offers turnkey system solutions for sensor data acquisition in any required size:

    • IoP systems (Internet of Plants) for wireless sensor data acquisition at freely positionable measurement points. Customer-specific preconfigured plug-and-play systems with online data visualization and data transmission via NB-IoT/LTE-M or LoRaWAN.
       
    • Mini systems with compact 4-channel data logger (DL18 and DL18-BLE) for flexible long-term measurements under field conditions. Compact and robust systems for connecting various sensors and decentralized measurement points.
       
    • Maxi systems for customer-specific system integration and individual measurement installations. From planning to implementation of complex measurement networks including sensors, power supply, and data transmission.
       
    • SDI-12 converter for analog signals for converting analog sensor signals into digital SDI-12 data. Enables the integration of ECOMATIK sensors into measurement systems without suitable analog inputs.

    Note

    The output signal of all Ecomatik dendrometers is an analog DC voltage. In addition, digital SDI-12 interfaces are available depending on the sensor model. Our dendrometers are therefore compatible with almost all common data loggers and microcontrollers with analog voltage input channels (e.g. Arduino) and can also be integrated into digital measurement systems via SDI-12. If you are unsure about the compatibility of an existing data logger or measurement system, please feel free to contact us at any time.

    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.

    General information on order processing

    Thank you for your interest in our products and services! Here you will find important information about the ordering process:

    To our international customers: Please note, we ship worldwide! If we do not currently have a listed distributor in your country (a list can be found here) , please feel free to contact us directly.

    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.

    Your contact details and Assessment of your needs

    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...