The PMA2101 UVB sensor gives an accurate measurement of biologically weighted ultraviolet radiation from sunlight or artificial light sources, also called sunburning UV radiation (SUV). Its spectral response follows closely the erythema action spectrum. The detector has angular response very close to an ideal cosine function (Lambertian response) making it suitable for measurements of diffuse radiation or radiation generated by extended sources.

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U.S.Pat.5,946,641

U.S.Pat.5,790,432

FEATURES

• High sensitivity
• Dynamic range 2*10⁵
• Excellent long term stability
• Cosine corrected
• NIST traceable calibration
• Radiometric and Biological units

APPLICATIONS

• Laboratory and industrial radiometry
• Skin and SPF testing
• Clinical studies
• Phototherapy
• Environmental monitoring
• Material testing
• UVB transmission measurements
• Agriculture

> Weatherproof UVB Sensor available

> Underwater UVB Sensor available

> Sensors need to be used with a Radiometer
> Analog version of this sensor can be used with any 0 to 5 VDC or 4 to 20mA recording device

When used with the PMA2100 OR pma2200 UV meters, the measured irradiance can be displayed in MED/Hr, µW/cm² well as a time to accumulate one MED. High dynamic range allows measurements of very week signals down to 0.01 µW/cm² as well as very strong irradiances over 1mW/cm².

The sensor is based on a phosphor technology, used in Robertson-Berger UV meters. and proven to be extremely stable over long periods of time.

The biologic effectiveness of ultraviolet radiation is strongest for wavelengths between 280 to 320 nm, classified as UVB by the CIE organization.

Several biologic action spectra, functions relating wavelength of the radiation and its biologic effectiveness, are shown in Figure 3. The most commonly used, erythema action spectrum, also referred to as CIE 1987 action spectrum, represents the sensitivity of human skin to sunburn.

Other biologic action spectra also exhibit rapid decline in UV effect with an increase of wavelength over the UVB range. In general, the reading of an erythemally weighted detector cannot be directly interpreted as biological effectiveness other than erythemal. However, there is a way to make necessary corrections numerically.

Specifications

• Spectral response Follows erythema action spectrum Figure 1
• Angular response 5% for angles <60°
• Range 200 [MED/Hr], 1,160 [µW/cm²]
• Display resolution 0.001 [mw/cm2], 0.01[W/m²]
• Operating environment 32 to 120 °F (0 to +50 °C) no precipitation
• Temperature coefficient 1% /°C for solar radiation
• Cable  5ft (1.5m)
• Diameter 1.6" (40.6 mm)
• Height 1.8" (45.8 mm)
• Weight 7.1 oz. (200 grams)

Analog versions of this detector are available See PMA1101

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