Technical data and functions

Erythema effective UV radiation

The natural UV radiation oft he sun or the UV radiation of artificial sources has different effects to human skin dependant on the wavelength range.
  • The long-wave UV radiation (more than 313 nm, UVA) tans the skin and supports the human immune system.
  • The short-wave UV radiation (less than 313 nm, UVB/UVE) may cause irreversable damage.
In the recommendation of the CIE ( Commission Internationale de l‘Eclairage) all spectral effect functions which can have a negative effect on the human skin are summarized. This recommendation is described in the DIN 5050 resp. ISO/CIE 17166 and valuated as a directive.

UVE-measuring head FLD7 03-UVE

The measuring head records the erythema effective UV radiation. The spectral sensitivity of the measuring head complies with the standards DIN 5050 and ISO/CIE 17166 and the Ordinance on Protection against the Harmful Effects of Artificial Ultraviolet Radiation (UV-Schutz-Verordnung - UVSV, published in the Federal Law Gazette 2011 Part I No. 37). The measurement results provide direct information about medically and biologically relevant correlations in this radiation range. DIN 5050 specifies four different skin types: Skin type I to IV. The UV Protection Ordinance - UVSV extends by two further skin types: skin type V and VI. The guideline for these six skin types are taken into account in the calculation of the various parameters. The measuring head is used in areas of medical and biological research, for the measurement of
UV radiation equipment (for cosmetic purposes, medical treatments or other human applications), in weather information and forecasting systems, in climate research and for general population information.. A popular measure of „sunburn sensitivity“ is the UV index „UVI“, which is determined by the German Weather Service.
The measuring head FLD7 33-UVE has a weatherproof, eloxated aluminium housing. The device dome consists of UV-transparent, ground quartz glass. The measurement is cos-corrected. The measuring head is suitable for continuous operation or control measurements outdoors.

Digital measuring head with ALMEMO® D7-connector

The measuring head works with its own AD converter. Extension cables and the ALMEMO® measuring instrument/data logger have no influence on the accuracy of the measurement..From the measured irradiance, all relevant measured variables are calculated and output to the ALMEMO® instrument. Different measuring channels can be selected and the measured variables can be displayed :
  • UV-index: relative irradiance related to 25 mW/m²
  • UVE irradiance (erythema-effective) in mW/m².
  • Dose (erythema effective irradiation) in J/m²: sum of irradiance over the irradiation period (energy).
  • Relative minimum erythema-effective dose (MED): Dose related to 1 MED (= erythema-effective threshold irradiation) of the set skin type according to DIN 5050 and UVSV. Example: 1 MED for skin type 2 (light-skinned European skin type) = 250 J/m².
  • Remaining time of irradiation in minutes until the dose 1 MED of the selected skin type is reached.
  • Current, predicted maximum irradiation time in minutes until the dose 1 MED of the selected skin type is reached.
  • Relative standard erythema effective dose (SED): Dose related to 1 SED (100 mW/m²) according to ISO 17166.

Compact Glossary of Meteorological Terms

Basics for measuring optical radiation