Light data-logger ULM-500

universal

The ULM-500 is a fast light meter / data logger with a high dynamic range and adequate optional PAR-sensors for independent PAR-measurements, PAR-monitoring or automated light list calibration of WALZ devices. Our data logger and sensors are capable of resolving the saturating light pulse of PAM Chlorophyll Fluorometers or fast light flecks in nature. Outstanding Properties of the ULM-500 •Data logger with high data storage capacity •Multiple sensor can be read in parallel •PAR calibration for PAM devices •Low power consumption, long battery life General Features ULM-500 Light Measurement The main purpose of the ULM-500 is light-measurement. The ULM-500 has two connectors for light sensors with BNC plugs. Typically, PAR sensors and pyranometers are linked to the ULM-500. PAR sensors measure the flux of quanta (unit, μmol m-2 s-1) in the photosynthetically relevant wavelength range, that is, between 400 and 700 nm. Pyranometers detect the power of radiation (unit, W m-2) mostly in a wider spectral range so that solar radiation arriving at the Earth’s surface can be measured. When power of radiation is measured, a flux of short-wavelength (e.g. blue) photon results in a higher signal than the same flux of photons with longer wavelengths (e.g. red) simply because the former flux carries more energy than the latter. The higher energy in blue than in red photons, however, is unavailable for photosynthesis so that photon fluxes as they are measured by PAR sensors are important for photosynthetic studies.