Fruit dendrometer
Dendrometer for measuring fruit growth
- Attaches to fruit in seconds
- Lightweight and does not damage the fruit
- Wind- and rain-resistant installation
- Dimensions to suit different fruit sizes
- Stable, adjustment-free operation
- Real-time measurement of fruit growth
- Swiss design and manufacture
Technical data
Specific data - Model S (small fruit)
| Measurement range | 9 mm to 42 mm |
| Overall dimensions | Ø 70 mm × h : 100 mm |
| Weight | 50 g |
Specific data - Model M (medium fruit)
| Measurement range | 19 mm to 90 mm |
| Overall dimensions | Ø 70 mm × h : 150 mm |
| Weight | 55 g |
General data - S and M models
| Sampling | 1 measurement every 15 minutes |
| Materials | Carbon fibre |
| Operating temperature | -20 °C to 60 °C |
Measurement characteristics - Diameter
| Precision | ± 0.05 mm |
| Resolution | 0.01 mm |
Measurement characteristics - Temperature
| Precision | ± 0,05 °C |
| Resolution | 0,01 °C |
| Measurement range | -20 °C to 60 °C |
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Trunk dendrometer
Dendrometer for measuring fruit growth
- Fast, solid fixing
- Discreet design
- Wind- and rain-resistant installation
- Stable, adjustment-free operation
- Real-time measurement of tree growth
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 100 × 12 × 12 mm |
| Weight | 60 g |
| Materials | Aluminium |
| Protection class | IP66 |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Diameter
| Sampling | 1 measurement every 15 minutes |
| Measurement range | 20 mm in circumference |
| Precision | ± 0.05 mm |
| Resolution | 0.01 mm |
Sensor data - Temperature
| Sampling | 1 measurement every 15 minutes |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
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Dendro 400
Dendrometer for measuring fruit growth
- Fast, solid fixing
- Discreet design
- Wind- and rain-resistant installation
- Stable, adjustment-free operation
- Real-time measurement of tree growth
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 20 × 20 × 260 mm |
| Use | External in a natural environment over several years |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Circumference
| Sampling | 1 measurement per day |
| Measurement range | 400 mm maximum extension |
| Resolution | 0.05 mm |
Sensor data - Temperature
| Sampling | 1 measurement per day |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
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Extenso 500
Dendrometer for measuring fruit growth
- Fast, solid fixing
- Discreet design
- Wind- and rain-resistant installation
- Stable, adjustment-free operation
- Real-time measurement of tree growth
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 25 × 27 × 250 mm |
| Materials | Aluminium, Stainless steel |
| Use | External in a natural environment over several years |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Diameter
| Sampling | 1 measurement every 15 minutes |
| Measurement range | 250 to 1000 mm extension |
| Precision | ± 50 µm |
| Resolution | 0.01 mm |
Sensor data - Temperature
| Sampling | 1 measurement every 15 minutes |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
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Applications
Orchards
Measuring the climate to optimise irrigation
Greenhouses
Measuring the microclimate in greenhouses
Crop research
Maintaining optimum germination conditions
Harvest forecast
Determining whether crops are ready for harvesting
Improving performance
Measuring crop stress and ensuring regular growth to prevent skin damage
Technical data
Measures
The fruit dendrometer measures the following elements:
- Diameter
- Temperature
Data is transferred via a bus interface I2C. Several dendrometers and other sensors can be combined on the same bus and share a single radio transceiver to transfer data for monitoring and analysis. The dendrometer has two categories of registers
- Ram registers: values that change frequently and are not saved after a reset.
- Flash registers: configuration values saved after a reset.
Writing and reading in registers
Configuration registers are read-only by default. ENABLE_MODE_CONFIG must be set to enable write mode.
Package format
Register mapping
Ram :
| Address | Name | Description | Reading/Writing |
| 0x00 | EXIT_DIAMETER_L | low byte diameter 0.01 mm/LSB | R |
| 0x01 | EXIT_DIAMETER_H | high byte diameter 0.01 mm/LSB | R |
| 0x02 | TEMPERATURE_OUTPUT_L | low byte diameter 0.1℃/LSB | R |
| 0x03 | TEMPERATURE_OUTPUT_H | high byte temperature 0.1℃/LSB | R |
| 0x06 | START_MEAS | write 1 to start measurement. always 0 if reading | R/W |
| 0x7F | ENABLE_MODE_CONFIG | when enabled, all addresses can be written to | W |
Flash:
| Address | Name | Description | Reading/Writing |
| 0x8A | CALIBRATION_OFFSET_L | 0.01 mm/LSB diameter low byte offset | R |
| 0x8B | CALIBRATION_OFFSET_H | high byte offset on diameter 0.01 mm/LSB | R |
| 0x8C | TEMPERATURE_OFFSET_L | temperature low byte offset 0.1℃/LSB | R |
| 0x8D | TEMPERATURE_OFFSET_H | temperature high byte offset 0.1℃/LSB | R |
| 0x8E | DIAMETER_LIMIT_LOW_L | low byte low saturation of diameter 0.01 mm/LSB | R/W |
| 0x8F | DIAMETER_LIMIT_LOW_H | High saturation of the low byte of the diameter 0.01 mm/LSB | R/W |
| 0x90 | DIAMETER_LIMIT_HIGH_L | low byte high saturation of diameter 0.01 mm/LSB | R/W |
| 0x91 | DIAMETER_LIMIT_HIGH_H | high byte high diameter saturation 0.01 mm/LSB | R/W |
The fruit dendrometer includes
- Spring arm with integrated sensors and signal conditioning
- Shielded cable
- 4-pole waterproof connector (for connection to our transceiver unit or to a bus extender)
Measures
| Temperature | Diameter | |
| Measurement units | Degrees Celsius | mm |
| Resolution | 0.1°C | 0.01 mm |
| Precision | +- 0.3°C | +-0.05 mm |
| Measurement range | 0°C to 65°C | 19mm to 90mm |
Sourcing
- 3.3V
- 7.4 mA (operating)
Initial configuration
All dendrometers are supplied with a default I2C address. To combine several dendrometers on the same bus, each must be reprogrammed with a unique I2C address; this configuration can be carried out when the order is placed or programmed on site before deployment.
Taking measurements
To make a measurement
- Write 1 to the START_MEAS register
- Wait 50 ms for the measurement to be taken
- Read the measurement (diameter, temperature) from the output register
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