DD-S Diameter Dendrometer small
The DD-S 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-S dendrometers are specially designed for small trees and branches as well as agricultural plants (diameter < 5 cm). The optimized device mounting enables stable installation without exerting excessive pressure on the measuring point. DD-S dendrometers thus deliver stable readings even on very small and herbaceous plants. DD-S dendrometers are available in three versions:
1. DD-S1: with standard mounting frame
2. DD-S2: with quick-mount frame
3. DD-S2W: with a quick-mounting frame and hermetically sealed to withstand extreme environmental conditions (under snow cover, underwater, elevated exposure to dust and corrosive agents)
Advantages of the DD-series
- Suitable for small trees and branches as well as agricultural plants with a diameter < 5 cm-Lightweight sensor
- Plants do not have to bear the weight of the sensor (requiresa separate supportaccessory for very small and sensitive plants)
- Injury-free installation, minimal pressure on the plant
- Stability against wind, snow, falling branches and fruits
Specific to the DD-S2 & DD-S2W models
- Quick mounting frame for fast, easy and tool
- free installation ofthe measuring object
Specific to the DD-S2W 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-S series
- Not suitable for diameters > 5 cm (see type DD-L)
Specific for the DD-S1 & DD-S2 models
- Not suitable for operation under extreme environmental conditions: e.g. high humidity, underwater, below snow cover, near the ground surface, elevatedexposure to dust or corrosive agents (e.g. coastal sands, volcanic ash), etc.(seemodel DD-S2W)
Models
| Models | Suitable for diameters | Measurement range |
|---|---|---|
| DD-S1 | 0 – 5 cm | 11 mm |
| DD-S2 (quick-mount frame) | 0 – 5 cm | 11 mm |
| DD-S2W (quick-mount-frame, hermetically sealed) | 0 – 5 cm | 11 mm |
Technical data
Sensor model name | Diameter Dendrometer Small Type DD-S1 | Diameter Dendrometer Small Types DD-S2 and DD-S2W (hermetically sealed) | |
Scope of application | Slow/average growth rates | Slow/average growth rates | |
Suitable for diameter | 0 to 5 cm | 0 to 5 cm | |
Special features/limitations | Fixation with a standard mounting frame | Fixation with quick-mount frame, much easier and faster installation, DD-S2W: sealed to withstand with a wide range operational conditions; see below. | |
Measurement range | 11 mm linear | 11 mm linear | |
Resolution | Data logger dependent e.g.: | Data logger dependent e.g.: CR300 series: 0.01 μm Dendrometer logger DL 18: 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) | 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) | Analogue, 0V bis 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 | |
Linearity | < 1% | < 1% | |
Operational conditions | All Models: normal outdoor field conditions, -25 to–70 °C, 0 to–100% relative air humidity | All Models: Hermetically Sealed Model DR1W: even under extreme environmental conditions (underwater, below snow cover, under exposure to strongly corrosive substances e.g. saltwater, ash, aggressive agricultural chemicals) | |
Weight (sensor without cable) | 13 g | 15 g /DD-S2), 25g (DD-S2W) | |
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 | |
Material | 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 |