Cut Sheet

V8-T12-38 Volume 8—Sensing Solutions CA08100010E—November 2012 www.eaton.com
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12.1
Sensor Learning Course
Learning Module 23: Limit Switches, Proximity Sensors and Photoelectric Sensors
In the Workplace
Paper breaks in a web printing press can result in time-
consuming manual re-threading of the paper if the break is not
immediately detected. A photoelectric sensor can detect this
condition instantly, and do it in this tight space
A Photoelectric Sensor Minimizes Downtime for this Printing Press
High excess gain and sharp optical cut-off of a diffuse mode
Perfect Prox ensure that background machinery is ignored.
Meanwhile, paper is detected, regardless of texture, color or
printing on it.
Review 8
Answer the following questions without referring to the material
just presented.
Match the output circuit reference to its definition.
5. The initials designating a transistor output that sinks current
from the load are ______________
6. The initials designating a transistor output that sources
current to the load are ______________
In questions 7 through 13, match the term used to describe
the following:
Answers to Review 8 are on Page V8-T12-41.
1. The current required to maintain
the sensor when a target is
present _____
A. Residual current
(leakage)
2. Having three connections
(three-wire) to the circuit _____
B. Burden current
3. The operating current the
switch pulls from the line _____
C. Load-powered
4. Having two connections
(two-wire) to the circuit _____
D. Line-powered
7. The delay of a sensor when the
system is first powered up _____
A. Release time
8. The period during target sensing
and the detector causing output
to change to ON state _____
B. Dwell time
9. The period during target exiting
the sensing range and the output
changing to OFF state _____
C. ON delay logic
10. The period during which the
target must stay in range to allow
the load to respond _____
D. One-shot logic
11. Logic module that allows output
signal only after target detection
for a set period of time _____
E. Time before
availability
12. Logic module that allows output
signal to be held ON for a set
period of time _____
F. OFF delay logic
13. Logic module that allows output
signal to be a specific length
regardless of target physical size
or detection timing _____
G. Response time