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Light meter for visible and UV light with 4…20 mA output series B517 |
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Description:
The meter measures light intensity in micro watt / square cm and the output is in 4 ... 20 mA.
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User Instructions: Hook up power to the sensor
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Calibration: Calibrated
to 10 micro watt / square cm for max output.
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Calculation
of Light intensity 1.
Example to show the total light energy with a Gilway light bulb
L7407 of 3000 Lx A
halogen light bulb shines in the hole of the sensor Calculation
Total
energy = 3000 Lx = 0.0015 x 3000 W = 5 Watt
This energy has to be seen in a ball of 1 meter radius
A ball of 1 meter radius has a surface of 10 square meters
The sensor has a inner hole of 10 square millimeter
Light energy going in the sensor in one meter distance is
5 Watt x 10 sqmm / 10 sqm = 5 micro Watt Example
to show the light energy measured with a sensor. The
total amount of the energy of the light bulb includes a part of the
infrared light. Light
energy seen over the spectra is measured in the light sensor. Light
energy for each color is: Integral
from the sensitivity of the sensor in its spectra x part of the light
energy from the spectra going in the sensor. In this example the sensor
shows the following output Total
= 3.5 micro Watt / sq cm 10
microwatt / sqcm =
20 mA 4
microwatt /
sqcm = 4
mA 3.5
microwatt / sqcm =
9.6 mA |
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