Temperature broad leaf and conifer needle (LAT-B2 / LAT-C1)

Leaf-to-Air-Temperature sensors (LAT) are used for direct, continuous and high-precision temperature measurements. The measured temperature parameters include absolute temperatures of the leaf surface, leaf-surrounding ambient air (Tair), and the temperature difference between leaf surface and ambient air (ΔTleaf-to-air). These devices are suitable for long-term application in outdoor conditions. Due to their extremely low power consumption, Ecomatik LAT sensors are ideal for battery-powered solutions, e.g., in IoT applications.

LAT-B2: Leaf-to-Air Temperature Broadleaf Type

The LAT-B2’s ultra-light carbon frame is mounted on a leaf and simultaneously measures absolute leaf temperature (Tleaf) and air temperature (Tair) using two high-precision micro-thermistor probes. Both probes are individually matched to each other and thus ensure maximum precision when determining the difference between leaf and air temperature (ΔTleaf-to-air).

LAT-C1: Leaf-to-Air Temperature Conifer Type

The lightweight LAT-C1 sensors are attached directly to the needles. A thin thermopile measures the average temperature difference between the surface of 10 needles and the surrounding ambient air (ΔTleaf-to-air). An additional micro-thermistor measures absolute temperature of the surrounding ambient air (Tair). Absolute needle temperature (Tleaf) is inferred from the two measured values.

Advantages

  • Direct, continuous and highly accurate measurement of blade temperature (Tleaf), air temperature (Tair), and leaf-air temperature difference (ΔTleaf-to-air)
  • Small, lightweight and flexible sensors to minimize loading on and damage to the measurement object
  • Easy installation
  • Maximum stability against wind and rain; specifically designed for field conditions
  • Customizable production possible, e.g. for specific leaf/needle size
  • Extremely low power consumption, suitable for IoT application

Specific to the Lat-B2 model

  • Sensor signal in mV, measurable with most common data loggers

Specific to the LAT-C model

  • 10 measuring points for 10 needles provide a spatially integrative temperature signal

Limits

  • Not suitable for leaves smaller than 2 x 2 cm (LAT-B2), or needles shorter than 3 mm (LAT-C1)

Specific to the LAT-C1 model

  • Two different output signals: a thermopile between ± 10 mV and a micro-thermistor probes with an analogue output signal between 0V and supply voltage (VEX).

Technical Data

Sensor model name

Leaf temperature sensor for broad leaves

Type LAT-B2

Leaf temperature sensor for conifer needles

Type LAT-C1

Scope of application

For continuous measurement of leaf surface (Tleaf), surrounding ambient air temperature (Tair), and leaf-to-air temperature difference (Δtleaf-to-air)

For continuous measurement of conifer needle surface (Tleaf), surrounding ambient air temperature (Tair), and leaf-to-air temperature difference (Δtleaf-to-air)

Suitable for

Leaf size > 2 x 2 cm

Conifer needle length > 3 mm

Special feature/limitations

Measurement of the absolute temperatures of leaf surface and ambient air, high accuracy in leaf-to-air temperature difference (individually matched probes)

Representative sensor output by integrating measurements from 10 single needles.

Measurement range

-25 to +70 °C

-25 to +70 °C

Resolution

Theoretically infinite depending on the data logger used

e.g.

CR300 logger (at 25 ° C): < 0.001 ° C

DL 18 Logger (at 25 ° C): < 0.002 ° C

Theoretically infinite depending on the data logger used

e.g.

CR300 logger (at 25 ° C): < 0.001 ° C

Accuracy

Sensor-dependent:

Absolute: max. ± 0.2 ° C.

Difference between leaf and air: max. ± 0.1 ° C

Logger dependent:

e.g.

CR300 logger (at 25 ° C): ± 0.03 ° C

DL 18 Logger (at 25 ° C): ± 0.07 ° C

Sensor-dependent:

Absolute: max. ± 0.2 ° C.

Logger dependent:

e.g.

CR300 logger (at 25 ° C): ± 0.03 ° C

Data logger requirements & sensor output signal

Minimum logger requirements:

2 single ended channels, providing a switched reference voltage (Vex)

Resolution: 12 bits in the measuring range from 0 to Vex

All loggers of Campbell Scientific, as well as the DL 18 logger meet these requirements

Output signal: analogue DC voltage in the range from 0 to Vex

Minimum logger requirements:

2 channels (1x single ended, 1x differential), providing a switched reference voltage (Vex)

Resolution: 12 bits in the measurement range from 0 to Vex (single ended), ≤ 5 μV in the measurement range of ± 10 mV (differential)

All loggers from Campbell Scientific meet these requirements

Output signal: analogue DC voltage in the range from 0 to Vex and analogue DC voltage in the range of ± 10 mV

Power supply

VEX (! Regulated!) 0.5 to 2.5 VDC, required excitation interval time max. 100 ms.

Power consumption negligibly low, max. 16.5 nWh per measurement

VEX (! Regulated!) 0.5 to 2.5 VDC, required excitation interval time max. 100 ms

Power consumption negligibly low, max. 8.3 nWh per measurement

Operational conditions

Air temperature: -25 to 70 ° C, rel. humidity: 0 to 100%

Air temperature: -25 to 70 ° C, rel. humidity: 0 to 100%

Size and Weight

2 x 2 x 0.1 cm, 1.4 g without cable

Length of the thermopile about 10 cm; 0.5 g

Sensor cable length

0.5m + 4.5m pluggable extension, plug extension up to max. 50 m possible

0.5m + 4.5m pluggable extension, plug extension up to max. 20 m possible

Manual

Technical data sheets

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Accessories & Compatible Products

Compatible sensors and peripherals:

Our open and modular system is highly flexible and easy to expand in stages. In this case, virtually all sensors or other peripheral devices (such as a webcam) can be integrated.

Ecomatik sensors include:

  • Dendrometers
  • Sap flow sensors
  • Temperature sensors
  • Leaf sensors
  • Humidity and air temperature sensor
  • Soil moisture sensors
  • And many more…

Contact

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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...