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Phone: +49 (0)8193-93700-0

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Phone: +1-978-462-1818


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Measure in the UV with this high-quality compact spectroradiometer


Broadband radiometer for radiation protection measurements of UV radiation devices

  • Mobile ligh meter for UV radiation while working with artificial UV (UVSV)
  • Erythema effective irradiance and detection of UV-C radiation in accordance with the UV protection Act for solaria (sunbeds).
  • UVSV, DIN EN 60335-2-27 and DIN 5050-1:2010-01 conformity

European Commission UV Protection Directive 

UV radiation is one of the most prevalent cancer risk factors. Because of this, federal lawmakers are trying to reduce the risk from artificial UV radiation with the UV Protection Directive. For sun tanning beds that emit UV radiation, this is achieved by a limit on the maximum UV output. 

UV Erythema Broadband Radiometer 

In order to provide the responsible committees with a mobile instrument to measure UV radiation in accordance with the UV Protection Directive, Gigahertz-Optik GmbH has developed the X14 Broadband Radiometer. 

UVA and UVB Two-channel UV Erythema detector head 

The UV radiometer‘s UV erythema detector head sets itself apart from others thanks to the fact that it features two UV radiation detectors. Separating the UVA and UVB spectral ranges between two radiation detectors reduces the crosstalk between the long-wavelength UVA and short-wavelength UVB spectral ranges. This design principle offers a greatly reduced measurement uncertainty compared to UV erythema measurement detectors with only one UV radiation detector. 

Actinitic UV Erythema Dose-Response Function 

The spectral sensitivity of the two UV radiation detectors take into account the UV erythema actinic function. Therefore the sum signal of the two UV radiation detector forms the effective UV erythemal irradiance. Additionally, both signals can be displayed separately in order to depict the ratio of UVB to UVA radiation. 

Detection of UVC Radiation 

In addition to the verification of the UV erythemal irradiance, the UV Protection Directive conform inspection of UV sun tanning beds also requires verification of the UVC irradiance in the spectral range from 200 to 280nm. The UVC radiation must be less than the limit of 0.003 W/m². The UV Eythema measurement head of the X14 includes a separate UVC detector for this purpose. 

UV Protection Directive Conformity 

The X14 Erythema UV meter and the XD-45-ERYC measurement head were developed in accordance with DIN 60335-2-27 and DIN 5050-1 conform to the respective critical values.

Artificial UV Sources and Sun Spectrum Correction 

The measurement uncertainty due to the spectral mismatching of Broadband Radiometers can be effective reduced if the spectrum of the measured lamp is known. The X14 UV Erythema Broadband Radiometer includes a database of common spectrums of artificial UV lamps, technical UV radiators, and the sun spectrum at various zenith angles. The measurement uncertainty of +/- 25% without knowledge of the lamp’s spectrum can be reduced to +/- 6.5% when the spectrum is known. 

Cosine-Corrected Field of View 

A basic prerequisite for the accurate measurement of UV irradiance of extensive UV emitters is that the UV meter has a cosine-corrected field of view. The UV Protection Directive refers to the DIN 5050-1 that dictates an f2 error of less than 0.06. 

Simple Operation and Handling 

Only three buttons and a clearly structured menu make the meter easy to operate. The UV radiation detector head is separate from the device and is connected to the device using a 2m cable. There is a mounting point for a tripod on the measurement head. 

Usage with a Computer 

The X14 UV meter includes a USB interface to enable operation with a computer. During USB operation the device is supplied with power through the USB interface. 

Threshold values from the UV Protection Directive

Relevant norms and regulations: UV Protection Directive, DIN EN 60335-2-27 (VDE 0700-27):2009-04, DIN 5050-1:2010-01


Threshold values irradiance 
UV Protection Directive 250 nm - 400 nm 0.3 W/m²eff
200 nm - 280 nm 0.003 W/m²
60335-2-27 250 nm - 320 nm 0.15 W/m²eff
320 nm - 400 nm 0.15 W/m²eff

No threshold value defined for UVC 200 nm - 290 nm

Threshold values spectral correction 
UV Protection Directive Consult 60335-2-27 and 5050-1
60335-2-27 No value for spectral correction
5050-1 f1< 0.2 for broadband radiometer without specification of reference spectrum
Threshold value cosine correction 
UV Protection Directive Consult 60335-2-27and 5050-1
60335-2-27 No specifications for difference to cosine

f2 <0 .06 for broadband radiometer

Threshold value temperature coefficient 
UV Protection Directive Consult 60335-2-27and 5050-1
60335-2-27 Measurement at 20 °C ± 5 °C ambient temperature
5050-1 0.005 K-1 (10 °C - 50 °C)
Burn-in period of UV Emitters 
UV Protection Directive Consult 60335-2-27and 5050-1
60335-2-27 Half of the maximum exposure time
5050-1 At least 15min and fluctuations less than ± 5 %
Exposure time for 100J/m²  
UV Protection Directive calculation example At Eeff 0.3 W/m² about 5 min und 30 s
100 J/m² / 0.3 W/m² ≈ 330 s
Threshold value measurement distance 
UV Protection Directive Consult 60335-2-27and 5050-1
60335-2-27 Min. recommended distance 100±2mm for facial radiation devices
5050-1 Full body radiation 0mm or in a radius of 30 cm
in front of the measurement point on the support surface



Effects of light propagation in a diffuse media

X14 with BHO case

Effects of light propagation in a diffuse media

Display of the UV Erythema effective and UVC irradiance with selected correction factor for solar radiation at 70 ° zenith angle

Effects of light propagation in a diffuse media

X14 being used for the measurement of UV radiation due to solar radiation.

Effects of light propagation in a diffuse media

XD-45-ERYC-4 UV erythema detector head with additional UVC radiation detection function