Features & Applications:
The Radiometer UVB Sensor gives an accurate measurement of the biologically
weighted ultraviolet radiation from sunlight, also called sunburning UV
radiation (SUV). Its spectral response follows closely the erythema action
spectrum [1].
Measurements taken with the PMA2104 are comparable to those made by submersible
spectroradiometers. The damaging effects of UV-B in the marine environment has
been shown for phytoplankton [2], algae, and fish [3].
The UVB Sensor is waterproofed, and can be safely submerged up to 100 meters.
The detector's housing is rugged and easy to handle in a harsh environment. Two
#10-32 taped holes on the bottom of the detector housing allow for attachment of
lowering cables or handles to the detector so its position can be established
and maintained. The weight of the detector is sufficient for easy submersion.
The biologic effectiveness of the UV radiation
can be measured in terms of effective irradiance in radiometric units, for
example [µW/cm2]. It is often related to the sensitivity of the human skin to
sunburn and expressed in Minimal Erythemal Doses per Hour [MED/Hr]. One MED/Hr
is the effective irradiance capable of causing minimum redness (erythema) in an
average number 2 skin. Based on a study [4], the relationship between MED/Hr and
radiometric units was determined to be:
1 [MED/Hr] = 5.833 [µW/cm2]
The integrated effective dose can be expressed in
[mJoules/cm2] or MED. It takes 1/2 hour to accumulate 1 MED when the subject is
exposed to an irradiance of 2 MED/Hr.
Sea level solar radiation under 3mm total ozone
column, clear sky:
overhead sun: approx. 0.32 W/m2 (5.5 MED/Hr)
30° SZA: approx. 0.25 W/m2 (4.3 MED/Hr)
60° SZA: approx. 0.05 W/m2 (0.9 MED/Hr)
Features:
- NIST Certification
- Takes measurement of ultraviolet radiation from sunlight
- Measures UVB penetration into fresh or salt water
- Waterproof, and can be safely submerged up to 100 meters
- Rugged housing
- Needs to be used with radiometer
Spec Summary:
|
Angular
response: |
15% for angles
<50° |
|
Range: |
20 [MED/Hr],
1,17 [µW/cm2] |
|
Display
resolution: |
0.001 [MED/Hr], 0.01[µW/cm2] |
|
Operating
environment: |
32 to 120 °F (0 to +50 °C) no
precipitation |
|
Temperature
coefficient: |
1% /°C for solar radiation |
|
Cable: |
35ft, (10.6m) Waterproof 7pin keyed |
|
Diameter: |
W/O Cable5.5" (139.7 mm) |
|
Height: |
3.5" (88.9 mm) |
|
Weight: |
W/O Cable48 oz. (1360 grams) |
Radiometer UVB Sensor for Underwater with NIST Certification
