Simply place a piece of photo-reflective material on your spinning part 3 centimeters from the sensor, and the infrared beam will bounce off of it and back to the sensor. This is how it measures the rpm of a rotating object with no contact. There is an output of 4.4 volts as well, for either high or low revolutions.
Display dimension : 3.43 x 1.59 inch.
PCB dimension : 3.43 x 3.22 inch.
Recommended Housing : FB05
Power requirement : 12 VDC
Can measure rpm. in a 100 - 60,000 revolutions/minute range.
5 digit LED display.
Distance between the photo reflective infra-red sensor and reflector = 3 cm.
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