Multi-sensor measurement system
Model DAS43X

The Holland Scientific Crop Circle DAS43X

multi-parameter sensor fuses multiple sensing devices into a single compact package. Data collected by the sensor can be utilized to quantify the radiative transfer properties for both soil and vegetation. The Crop Circle DAS43X’s versatility allows it to be deployed for both stationary and mobile applications. Additionally, the Crop Circle DAS43X can be networked with other Holland Scientific crop canopy sensors or with third-party sensors in order to expand on its already data rich capabilities.

Measurements provided by the Crop Circle DAS43X include: upwelling and downwelling photosynthetic active radiation (PAR), canopy temperature, air temperature, relative humidity and atmospheric pressure. The Crop Circle DAS43X also includes two 24-bit differential voltage channels.

Holland Scientific DAS43X


Radiative transfer (RT) modeling is an area of primary use for the Crop Circle DAS43X. Data collected by the sensor can be used to assess underlying physical processes related to the interaction of radiation with the plant foliage at the canopy level. Sensor data can be combined with other sensors, such as the Crop Circle ACS-430P, to provide even more canopy information related to a plant canopy’s biophysical characteristics.


Log Crop Circle DAS43X data using the new GeoSCOUT X GPS data logger. The GeoSCOUT X has 2GB of internal memory and internal GPS. All recorded data are saved using a comma-separated-variable text format for easy import into third-party GIS mapping and analysis software. The GeoSCOUT X can support four Crop Circle DAS43X sensors plus two additional RS232 serial devices. Position offsets for each sensor can be readily configured.



Upwelling and downwelling PAR, canopy temperature, air temperature, relative humidity, atmospheric pressure

Two 24-bit differential voltage channels


Trend diurnal changes in plant growth

High throughput Phenotyping

Agrochemical performance assessment

Net primary production estimation

fAPAR estimation

Nutrient studies

Holland Scientific DAS43X


Measurements: Canopy temperature (IRT), air temperature, atmospheric pressure, relative humidity, reflected second, determined by GPS output rate and incident PAR, 2 voltage measurement channels (compatible with type T, K and E thermocouples)
IRT Spectral Bandwidth: 5.5um to 14um
IRT Field-of-View: ≈ 30 degrees
IRT Emissivity: 0.95
IRT Temperature: 0 to 55°C, ±0.5°C
Ambient Air Temperature: 0 to 55°C, ±0.3°C Par Sensor
Spectral Bandwidth: Nominally 400nm to 700nm
Reflected Par Field-of-View: ≈ 30 degrees
Atmospheric Pressure: 15 to 115 kPa, ±1.5% FS
Relative Humidity: 0 to 100% non condensing; 10 to 90%, @ ±4% FS
Common Mode Voltage Range: 0 to 4.5 Volts
Common Mode Rejection: >100dB
Differential Input Impedance: >1Mohm
Differential Voltage Input Channel Span: ±2.5 Volts, 24 bits
Common Mode Rejection: >100dB

Data Collection: GeoSCOUT X geospatial data logger
Autosend Output Rate: 5 samples per second
Networked Sample Rate: 5 samples per second

Enclosure: Plastic (polycarbonate and PVC) and Aluminum
Environmental: IP64 for dust and moisture resistance
Electrical Power: 11.5 to 16.5 VDC @ < 300mA
Operation range: 0 to 50°C

Crop Circle DAS43X Calibration Kit: Includes DAS43Xcommunication software, USB to RS485 converter, cables and manual.

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