PAR Sensor Export to Denmark: April 2025 | NiuBoL

On 15 April 2025, NiuBoL announced the export of the NBL-W-PARS PAR sensor to Denmark. This photosynthetically active radiation instrument measures light within the 400-700 nm band for agricultural meteorology and plant-light research. It provides a light measurement for a monitoring system; it does not directly measure the rate of photosynthesis or establish a crop-yield result.

A PAR sensor for plant-light observations

The NBL-W-PARS combines a silicon detector with an optical filter and a cosine-corrected sensing surface. This arrangement responds to radiation arriving within the selected spectral band while accounting for the angle of incoming light. In agricultural monitoring, the resulting record helps researchers compare exposure above a crop, under a covering or between experimental positions.

A PAR record becomes more informative when it can be compared with crop stage, irrigation events and temperature measurements. A low reading under a shade screen, for example, describes the light reaching that position. Explaining a change in plant growth still requires observations of the plants and the other growing conditions.

Connecting the NBL-W-PARS to a monitoring project

The measurement unit needs attention during integration. A radiometric reading in W/m2 is not interchangeable with a photon-flux reading in micromol/m2/s. The receiving system must use the unit and conversion coefficient supplied for the ordered instrument. Changing the display label is not a conversion. Daily light integral calculations require a suitable photon-flux time series and an integration function in the logger or software.

For an RS485 connection, the integrator needs the device address, communication settings and register scaling. A voltage-output version needs a matching analog input. Remote transmission, where required, is a separate function of the data logger or gateway rather than a connection provided by the PAR sensor itself.

Planning a comparable plant-light installation

Define whether the sensing surface represents incident light above the canopy or light at a selected position within it. Keep the measurement plane consistent, avoid unintended shadows from supports and inspect the optical surface for deposits. In greenhouses, different glazing, shade-screen positions and lamp spectra can affect the comparison between monitoring points.

For a similar order, send NiuBoL the required light quantity and unit, natural or artificial light source, mounting position, supply voltage and receiving controller. Those details allow the NBL-W-PARS configuration to be checked against the project before quotation. The Denmark export concerns the PAR instrument; a complete plant-monitoring package can be specified separately around the measurements the project needs.