Cut Sheet

Volume 8—Sensing Solutions CA08100010E—November 2012 www.eaton.com V8-T12-29
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12.1
Sensor Learning Course
Learning Module 23: Limit Switches, Proximity Sensors and Photoelectric Sensors
In the Workplace
Hobbes Gear wanted to reduce the number of gears rejected on
their line. One critical process is the automatic drilling of the
gear’s mounting hole. To increase the reliability of the inspection
process, Hobbes installed a Perfect Prox sensor.
A Perfect Prox is “Inspector #12”
The sensor is set to check for the presence of the machined
hole in the gear. If the hole is present, the sensor’s light shines
through it, to the conveyor belt. The belt is just beyond the
sensor’s sensing distance. If a missing hole is detected, the
sensor signals an air-operated cylinder plunger to reject the gear.
Review 6
Answer the following questions without referring to the material
just presented. Begin the next section when you are confident
that you understand what you’ve already read.
1. The four modes of detection are:
________________________
________________________
________________________
________________________
2. If the photoelectric sensor control generates an output
when the photodetector does not see light, the control is
working in the dark operate mode. TRUE FALSE
Match the mode of detection with its definition.
Answers to Review 6 are on Page V8-T12-41.
Cutoff
Distance
Detection
Distance
Gear
Cut-away
Perfect
Prox
Sensor
Detection
Zone
3. Mode of detection that
senses by reflecting light
off the objects
______ A. Reflex
4. Sensing mode that has
the longest range
______ B. Perfect Prox
5. Sensing mode that
combines extremely high
sensing power with a
sharp optical cut-off
______ C. Thru-beam
6. A polarizing filter used
with this sensing mode
ensures that only the
light reflected by a retro-
reflector is recognized
by the sensor
______ D. Diffuse reflective