Multi-sensor measurement system
Model DAS44X

The Holland Scientific
Crop Circle DAS44X

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 DAS44X’s versatility allows it to be deployed for both stationary and mobile applications. Additionally, the Crop Circle DAS44X 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.



Radiative transfer (RT) modeling is an area of primary use for the Crop Circle DAS44X. 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-435P, to provide even more canopy information related to a plant canopy’s biophysical characteristics.


Log Crop Circle DAS44X data using the new GeoSCOUT X GPS data logger. 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 DAS44X 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, SONIC distance to canopy

16-bit differential voltage channels


Trend diurnal changes in plant growth

High throughput Phenotyping

Agrochemical performance assessment

Net primary production estimation

fAPAR estimation

Nutrient studies



    • Measurements: Canopy temperature (IRT), air temperature, atmospheric pressure, SONAR, relative humidity, reflected and incident PAR, 2 voltage measurement channels
    • IRT Spectral Bandwidth: 5.5um to 14um
    • IRT Field-of-View: ≈ 30 degrees
    • 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%
    • Sonar: 0-150 cm
    • Common Mode Voltage Range: 0 to 4.5 Volts
    • Common Mode Rejection: >100dB
    • Data Collection: GeoSCOUT X geospatial data logger
    • Stand-Alone Output Rate: UP to 10 samples per second
    • Networked Sample Rate: Determined by the GPS update rate
    • Enclosure: Plastic (polycarbonate and PVC) and Aluminum
    • Environmental: IP54 for dust and moisture resistance
    • Electrical Power: 11.5 to 16.5 VDC @ < 300mA
    • Operation range: 0 to 50°C
    • Serial/Power Connector: 12-pin Deutsch, O-ring sealed
    • Crop Circle Das44X Calibration Kit: Includes DAS44X communication software, USB to RS485 converter, cables and manual.

    Specification are subject to change without notice.