The PMA1121 analog blue light safety sensor offers an accurate, easy, inexpensive way to measure the blue light radiation hazard to eyes for a wide range of occupations. Employers, safety officers and risk managers can use this detector to protect workers against the effects of excessive daily blue light exposure. Such exposure, according to numerous medical studies, can inflict permanent and irreversible damage to the eye causing visual field defects and visual impairment.

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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
• Ease of use

APPLICATIONS

• Industrial and laboratory safety
• Welding stations
• Printing
• UV curing and photolithography
• Lighting
• Safety glass testing
• Environmental testing

> Weatherproof Blue Light UV Detector available

> Underwater Blue Light UV Detector available

> Wiring Diagram

The PMA1121 Analog Blue Light Safety sensor indicates the effective irradiance weighted with the American Conference of Governmental Industrial Hygienists (ACGIH) Spectral Weighting Function for blue light hazard. Light sources that may produce a blue light hazard include: monochromatic and collimated lasers as well as collimated arc, or tungsten lamps (e.g. search lamps). Flash lamps generally do not present serious hazard because of the limited energy of the flash as compared to continuous sources.

To protect against retinal photochemical injury from chronic blue-light, the max. exposure limit for a source subtending less than 0.011 radian should not exceed 10mJ/cm² per 10,000 seconds of exposure (approx. 2 hours 47 minutes). For exposure periods greater than 10,000 seconds the weighted irradiance should not exceed 1µW/cm².

Typical blue light levels are:
150 W halogen lamp at 50 cm distance - 70 µW/cm²

150 W Xe arc lamp at 50 cm distance - 80 µW/cm²

40 W fluorescent tube at 2 m distance - 5 µW/cm²

Specifications

• Spectral response Follows ACGIH blue hazard action spectrum Figure 1
• Angular response 5% for angles <60°
• Range 2,000 µW/cm², 20,000 mW/cm²
• Display resolution 0.01 µW/cm², 0.1 mW/m²
• 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)

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