Light meter for visible and UV light with 420 mA output series B517

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The meter measures light intensity in micro watt / square cm and the output is in 4 ... 20 mA.


Technical Data:
Power: 24 Volts and 50 mA consumption  
Materials: Housing = ABS natural   Seal = Sealon PTFE   Screws = stainless steel 301
Refraction formula: see refraction patent
Connection: 9 pole D connector
Work Distance: 5 thou to touching
Resolution: Within 0.1% accuracy in digital steps

User Instructions:  Hook up power to the sensor



Calibrated to 10 micro watt / square cm for max output.


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