DD-L Radial Dendrometer Large (Diameter 3-30 cm)

Sensor model name

Diameter Dendrometer large

Types DD-L1 and DD-L1W (hermetically sealed)

Diameter Dendrometer large

Type DD-L2

Diameter Dendrometer large

Type DD-L3

Scope of application

Slow/average growth rates

Fast-growing

Very fast growing

Suitable for diameter

DD-L1: 3 – 30 cm; DD-LW: 3 – 20cm

3 – 30 cm

3 – 30 cm

Special features/limitations

DD-L1W: sealed to withstand a wide range of operational conditions, see below.

Extended measurement range, for fast-growing species

Extended measurement range, for very fast-growing species

Measurement range

11 mm linear

25.4 mm linear

50.8 mm linear

Resolution

Data logger dependent e.g.:

CR300 series: 0.01 µm

Dendrometer logger DL18: 0.2 µm

Data logger dependent e.g.:

CR300 series: 0.03 µm

Dendrometer logger DL18: 0.5 µm

Data logger dependent e.g.:

CR300 series: 0.05 µm

Dendrometer logger DL18: 1 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. ± 1.97% of the measured value (stable offset)

Data logger dependent e.g.:

CR300 series: ± (0.04% of the measured value + 0.6 µm)

Dendrometer logger DL18: ± (0.1% of the measured value + 1 µm)

Dendrometer dependent: max. ± 0.98% of the measured value (stable offset)

Data logger dependent e.g.:

CR300 series: ± (0.04% of the measured value + 1.2 µm)

Dendrometer logger DL18: ± (0.1% of the measured value + 2 µm)

Output signal

Analogue, 0V to Vex (excitation supply voltage)

Analogue, 0V to Vex (excitation supply voltage)

Analogue, 0V to 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

< 0.2 µm/°C in the whole measurement range

Linearity

< 1%

< 0.7%

< 0.5%

Operational conditions

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity;

Hermetically Sealed Model DD-L1W:

even under extreme environmental conditions (underwater, below snow cover, under exposure to strongly corrosive substances e.g. saltwater, ash, aggressive agricultural chemicals)

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity

All Models:

normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity

Weight (sensor without cable)

13 g

33 g

43 g

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

Vex (! stabilized !) 0.5 to 10 VDC,

Power consumption max. 0.28 µWh per measurement

Material

Stainless steel and aluminium

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

5 m, extendable on request to max. 100 m