Pma2111.jpg (8685 bytes)The PMA2111 UVA detector provides fast and accurate irradiance measurement in the UVA region. Its spectral response covers the 320 to 400nm range.  The detector’s enclosure is hermetically sealed and suitable for permanent outdoor operation. The Teflon diffuser assures an angular response close to a cosine function (Lambertian response) making the detector suitable for measuring diffused radiation or radiation from extended sources. The PMA2111 detector is ideal for measuring mercury, xenon, metal halide or fluorescent lamps, commonly used for studies in the UVA region, as well as sunlight.

The measured irradiance is displayed in mW/cm2 or W/m2, user selectable. Consequently, the integrated dose is shown in Joules/cm2 or kJoules/m2. The PMA2111 has a resolution of 0.001 mW/cm2 and a full scale of 200mW/cm2 allowing measurement of very week and very strong signals with the same detector. The effect of stray light is negligible.

 

UVA is less biologically effective than UV-B (280-320nm). However, because of its much greater intensity in sunlight and many artificial sources and the greater period of the day in which sunlight UVA remains at high intensities, UVA can have significant biological effect. The UV-A radiation can also penetrate deeply into human living tissue through the skin. Commonly known effects of UV-A include: photosensitization of various chemicals, pigmentation of the skin, induction of polymerization. The UVA can also cause erythema or DNA damage in humans or animals, however large doses of UV-A are needed and the damage mechanisms are different than these of UV-B.

Several biologic action spectra, functions relating wavelength of the radiation and its biologic effect, are shown in Figure 3. While they all show strong dominance of UV-B effectiveness there is still fair UVA response.

 

Features

  • High sensitivity
  • Wide dynamic range
  • Excellent long term stability
  • Cosine corrected
  • NIST traceable calibration
  • Radiometric units
  • Weatherproof

 

Common sources of UV-A

  • low pressure florescent lamps
  • high pressure mercury and metal halide lamps
  • high pressure xenon lamps
  • sunlight

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Figure 3: Selected Biologic Action Spectra

SPECIFICATIONS

Spectral response

320-400nm, figure 1
Angular response

5% for angles <50°
Range

200 [mW/cm2] or 2000 [W/m2]
Display resolution

0.001 [mW/cm2], 0.01[W/m2]
Operating environment

-40 to 120 °F (-40 to +50 °C) outdoors
Temperature coefficient

<0.1%/°C
Cable

50ft
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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