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PMA 2130 Photopic Detector
 

The PMA2130 is a portable illumination detector (Lux detector) with spectral response following the CIE photopic action spectrum. This detector is designed to have a spectral response like that of the human eye’s visual response in the photopic region. 

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Features:

  • High sensitivity
  • Wide Dynamic range
  • Excellent long term stability
  • Cosine corrected
  • NIST traceable calibration
  • Selectable Units 

> 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

Applications:

  • Environmental monitoring
  • Industrial and laboratory safety
  • Industrial and residential lighting
  • Art and museum maintenance
  • Photography and film studios
  • Clinical studies

Description:

The spectral response of the human eye changes with light intensity. The eye has two distinctive spectral responses, which are defined according to the brightness of the light entering the eye. The first spectral response of the eye occurs under typical daytime lighting conditions (photopic) defined for light intensity greater than 0.1 Lux. The second spectral response occurs under low light conditions (scotopic) defined for light intensity between 0.01 and 0.0001 Lux. Light intensity less than 0.0001 Lux is undetectable by the human eye. The eye's shift from the photopic response to the scotopic response is know as the Purkinje shift. The photopic spectral luminous efficiency curve peaks at 555nm and it is normalized to 1 at that wavelength.

The power-like unit of brightness-sensation-producing ability of light is Lumen [lm]. The relationship between effective Watts and Lumen has changed several times during 20th century and it is now assumed to be 683 lm/W. For example, 555-nm monochromatic radiation flux of 1W would carry the luminous flux of 1 lm. Please note, that scotopic spectral luminous efficiency as well as the conversion factor between Watts and scotopic lumens differ from their photopic counterparts.

The illumination (illuminance) is measured in luminous flux per unit area. The following units are commonly used:

1 lumen/cm2 = 1 phot (ph)

1 lumen/ft2 = 1 foot-candle (ft-cd)

1 lumen/m2 = 1 lux (lx)

with ft-cd and lux dominating in the field.

The PMA2130 detector has a Teflon diffuser assuring an angular response close to the cosine function (Lambertian response). It is of particular importance when measuring radiation flux from extended sources or from sources positioned at an angle to the axis of the detector.

> PMA2130 Photopic Visible Light Detector Spectral Response

Specifications:

  • Spectral response: Follows CIE photopic spectral luminous efficiency curve (400-700nm) Figure 1
  • Angular response: 5% for angles <60°
  • Range:
    PMA2130 - 150,000 Lux, 220 W/m2, 14,000 ft-cd
    PMA2130L - 1,500 Lux, 2.2 W/m2, 140 ft-cd
    PMA2130H - 1,500,000 Lux, 2200 W/m2, 140,000 ft-cd
  • Display resolution:
    PMA2130 - 1 Lux, 0.001 W/m2, 0.1 ft-cd
    PMA2130L - 0.01 Lux, 0.00001 W/m2, 0.001ft-cd
    PMA2130H - 10 Lux, 0.01 W/m2, 1 ft-cd
  • 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. Output is linear when connecting to a recorder, 0-5VDC and 4-20mA.

Technical Papers and Protocols:

> ICH Harmonised Tripartite Guideline - Stability Testing: Photostability Testing of New Drug Substances and Products.

> Interfacing PMA detectors to a Campbell data logger - app111.pdf

> PMA Series capabilities and applications - app112.pdf

> PMA detector integration - app120.pdf

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