Product Information

PAR SunScan light incidence measurement system

The photosynthesis processes in plants and the biomass production depend heavily on solar radiation. For this reason data on the PAR (“photosynthetic active radiation“)  are of great significance if the ideal light conditions for maximum yields are to be determined. The SunScan system supplies such data and is suitable for measuring and analysing the PAR in the leaf canopies of crops. The Sun-Scan package consists of a light incidence probe, data acquisition module and software. The probe can also be supplied separately if data acquisition systems are already present. The probe is 1 m long and contains 64 PAR sensors which are read out during every measurement.
Connection to a data acquisition module uses the RS232 interface. Fast and accurate measurements can be taken using the control button on the probe handle. Using the data acquisition module the probe is programmed for automatic measurement at intervals ranging from 1 second  to 24 hours. The data module reads out the readings and calculates the average light level of each individual sensor. The individual readings remain in the memory, which enables an additional, more detailed examination of the PAR. The raw data and the derived functions (light transmittance/LAI) can be collated, stored and displayed. Average values for groups of readings can be created, and various display and memory formats are available for this feature. The data acquisition module is a light, handheld computer with removable flash memory card for data storage. The 256 KG memory card supplied has room for around 2000 readings. A laptop can be connected to the RS232 interface of the light incidence probe as an alternative to the data acquisition module. All functions and options in the data acquisition module can be used by means of the supplied Sun-Data software for programming, display and data analysis. An external PAR sensor is likewise available for measuring the PAR above the leaf canopy and in direct and diffuse light. The maximum reading is 2500 ?mol/(m²s). The sensor uses a number of photodiodes and a unique shaded pattern to calculate whether the sun is shining and to measure the direct and diffuse components of solar radiation. This means that no laborious shade ring settings need to be adjusted, as is the case with conventional light sensors. A telescopic tripod is available for simple positioning of the external sensor.



  • Ease of use
  • Sensor distribution over 1m
  • Analysis of data immediately in situ




Technical Specifications

Technical Specifications

Measurement range:0 ... 2500 µmol/(m²s)
Measurement accuracy:< ±3 µmol/(m²s)
Measurement range (PAR):400 … 700 nm
Power supply:Alkaline battery



Order Numbers + Accessories


Ordering Details:

Art.-Nr.:  176000 Set with data acquisition module and software
Art.-Nr.:  176010 Separate probe




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Tel.: +49 (0) 8161 - 23 46 441
Fax: +49 (0) 8161 - 23 46 443