Illuminance meter (0–150klux) mV output / MC8PHOT-13NS

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last updated：Oct 04, 2023

シロ産業

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High sensitivity mV, DC 4-20mA, 0-1V output, level gauge, with shielding plate.

High sensitivity mV, DC 4-20mA, 0-1V output, with level gauge and shielding plate. It measures illuminance (lux), defined as the ratio of luminous flux (lumens) incident on a surface to the unit area (m²). The spectral response curve of the photometric measurement probe approximates the standard photopic response curve V(λ), which is known as the response curve of the human eye. The difference in the standard photopic response curve V(λ) in the spectral response is calculated as error f'1. It has a robust structure, designed for long-term outdoor use, and is primarily used for meteorological measurements in daylight.

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■Operating Principle The MC8PHOT-13NS is based on a semiconductor sensor, and its spectral response is corrected by a filter to match the response of the human eye. Representative spectral sensitivity is shown in Fig. 1. To protect the sensor from the external environment, the MC8PHOT-13NS is equipped with a transparent glass dome with a diameter of 50mm. The PTFE diffuser and unique case shape provide cosine correction, achieving good response. The difference between theoretical response and actual response is shown in Fig. 2. Due to its excellent cosine correction, the MC8PHOT-13NS can be used even when the solar elevation angle is low.