PMA2130 Photopic Detector

This 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.

PMA2130 for use with PMA2100 or PMA2200 meters

PMA1130 Analog version, 0-5VDC Output

PMA1130 Analog version, 4-20mA Output

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U.S.Pat.5,946,641

U.S.Pat.5,790,432

Features:

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

Applications:

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

> 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

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: PMA2130

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

NEW PMA2130D - 200 Lux, 19 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

NEW PMA2130D - 0.001 Lux, 0.001 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)

Common Options:

WP = weatherproof housing, submersible to 3m depth

UW = Underwater housing, submersible to 100m depth, cable not included

F = Low profile housing

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

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