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PMA 2120 UV Radiation Safety Detector
 

The PMA 2120 UV Radiation Safety Detector gives an accurate measurement of hazardous radiation to which an industrial worker may be subject.

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FEATURES

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

APPLICATIONS

  • Industrial and laboratory safety
  • Hospital monitoring
  • Germicidal lamps monitoring
  • Commercial lighting
  • Safety glass testing
  • Welding
  • UV curing and printing

> Detectors need to be used with a Radiometer

> Analog version of this detector can be used with any 0 to 5 VDC or 4 to 20mA recording device

When used with the PMA2100 Radiometer, it indicates how long a worker may remain at the measured position before reaching the threshold limit value (TLV) proposed by the ACGIH [1]. If desired, the instantaneous effective irradiance can be displayed in µW/cm2. The radiation can be integrated over time and the dose in mJ/cm2 can be shown on the LCD.

The TLV exposure dose has been chosen by the ACGIH as one that can be tolerated, even if repeated every work day, without causing any long term effect. The TLV for occupational exposure takes into consideration the risks of acute and chronic injury to both an eye and skin.

The eye is the most radiation sensitive organ, therefore the dose which will cause no eye damage is the maximum allowable radiation dose. Actinic ultraviolet radiation (UV-B and UV-C) is strongly absorbed by cornea and conjunctiva. Overexposure of these tissues cause keratoconjunctivitis, commonly referred to as welder’s flash or arc-eye.

Measurements of eye damaging radiation in rabbits and in monkeys show a peak sensitivity at 270 nm. and a minimal dose for damage of about 4-5 mJ/cm2. Ultraviolet radiation damage is gradually repaired depending on degree of damage. Damage from a minimal dose should be repaired within 24 hours.

The meter indicates how long a worker may remain at the measured position before reaching the threshold limit value (TLV) proposed by the ACGIH The TLV of 3 mJ/cm2 in an 8 hour period has been chosen by the ACGIH as one which can be tolerated, even if repeated every work day, without causing any long term effect.

The meter reading should be of the highest intensity at a site. The worker’s natural avoidance of the usually bright UVR light source, and the contraction of the pupil provide additional safety from the measured UVR when it emanates from a visually bright source. Even without these normally occurring safety enhancements not exceeding the TLV will provide adequate protection.

The TLV for UV radiation specified by ACGIH apply to sources which subtend an angle less than 80°. Sources which subtend a greater angle need to be measured only over an angle of 80°.

The instantaneous value indicates how long an exposure at the intensity being measured is required to produce a dose of 3 mJ/cm2. The PMA can also be set to continuously monitor UV and sound an alarm when the preset dose or irradiance level is reached.

Specifications

  • Spectral response Follows ACGIH UV hazard action spectrum, Figure 1
  • Angular response 5% for angles <60°
  • Range 1 [mW/cm2]
  • Display resolution 0.01 [µW/cm2]
  • Operating environment 32 to 120 °F (0 to +50 °C) no precipitation
  • 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 PMA1120

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