Trunk Dendrometer.


Trunk Dendrometers

  • The Implexx Trunk Dendrometers are ideal for irrigation and scientific research.
  • Model DE-1T Trunk Dendrometer
  • Low cost, high accuracy dendrometer for trunks >6 cm (2.4 in) diameter;
  • SDI-12 digital output for data loggers, LoRaWAN and internet enabled devices;
  • 0.001 mm resolution for precision measurements;
  • Easy to install and very low ongoing maintenance.


The DE-1T Dendrometer is a highly precise incremental LVDT-based sensor for monitoring micro-variations of trunk radius in micron range.

The DE-1T is ideal for correlating tree trunk or stem diameter variations against environmental variables, or tree water use of water potential, for a complete and comprehensive analysis of tree physiology.

The DE-1T dendrometer is ideal for horticultural tree crops, such as almonds, citrus, pistachio, stone fruits, and more. The DE-1T is also ideal for viticulture and grapevines.


Ideal for Internet Enabled Devices and Remote Field Monitoring

The DE-1T Trunk Dendrometer is ideal for IoT devices and remote field monitoring because:

  • It operates via the SDI-12 protocol which is supported by a wide range of data loggers and telemetry units;
  • It has low power requirements and can be supported off small batteries;
  • It is quick to install (less than a few minutes) and ongoing maintenance is minimal.

The team at Implexx can provide data loggers and telemetry devices. Our international network of accredited dealers and agents also have a range of data acquisition options that may be unique to your specific location. Otherwise, we can assist in connecting our dendrometers to your existing irrigation monitoring or data acquisition system.


Irrigation Monitoring, Carbon Allocation, Growth Rates, and More

The DE-1T is suitable for a wide range of applications including:

  • Irrigation monitoring and scheduling;
  • Fertigation or nutrient monitoring and scheduling;
  • Carbon allocation, biomass accumulation and relative growth rates;
  • Maximum Daily Shrinkage (MDS) and other calculated variables.


More Information

Dendrometer Data Fruits

Figure 1A. Three days of dendrometer data.

Plant growth and water balance affect diurnal behaviour of trunk radius. The growth rate depends on a vegetation stage and environmental conditions. The diurnal variations represent mostly fluctuations of water content in plants. Two radius-based indices are commonly used for evaluating plant water status: daily contraction amplitude and trend of daily maxima. The DE-1T Dendrometer allows investigating effects of irrigation rate and other environmental factors on water balance and growth of plants.

The DE-1T Dendrometer includes a linear displacement transducer (LVDT) mounted on a special rod with threaded end. When the rod is anchored inside the trunk, the LVDT represents the movement of trunk surface. Thus, the output signal follows variations of distance between trunk surface and the end of the rod, which is anchored inside the trunk.

A signal conditioner provides excitation of the LVDT and production of standard linear output signal.

The probe is connected by a standard 1-meter cable to the waterproof box with the signal conditioner inside.

The output cable length should be specified in the order if required.




Feature Specification
Tree Trunk Diameter Minimum: 6 cm | Maximum: no limit
Measurement Range 0 to 10 mm
Resolution 0.001 mm (1 um)
Accuracy 0.005 mm (5 um)
Output SDI-12
Power Input 5 to 24 VDC
Operating Temperature 0 to 50 ℃
Temperature Effect < 0.02 % total stroke / ℃
Excitation Time 5 seconds
Carrying Rod Dimensions 160 L × 4 ∅ mm
Threaded End Dimensions 10 L × 5 ∅ mm
Cable length between probe and signal conditioner 1 m
Cable Length 5 m (standard) | 60 m (maximum)
Warranty 1 year

Manual & Docs



Application Notes and Articles


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