|
UVA
Detector for Outdoor Installation |
|
 |
Features
 | High sensitivity |
| Wide dynamic range |
| Excellent long term stability |
| Cosine corrected |
| NIST traceable calibration |
| Radiometric units |
| Weatherproof |
|
| 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. |
|
Sources of
UVA
| low pressure florescent lamps |
| high pressure mercury and metal halide lamps |
| high pressure xenon lamps |
| sunlight |
|
| 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. |
|
|
|
|
|
|
|
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 |
|
|
Return to Detector Selection Guide
|
