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Types of Sensors, Advantages & Disadvantages of all types Sensors, Applications of Sensors 


One type of feedback frequently needed by industrial-control systems is the position of one or more components of the operation being controlled. Sensors are devices used to provide information on the presence or absence of an object.


Sensors include limit switches, photoelectric, inductive, capacitive, and ultrasonic sensors. These products are packaged in various configurations to meet virtually any requirement found in commercial and industrial applications. 

In addition to the advantages and disadvantages of each of these sensor types, different sensor technologies are better suited for certain applications. The following table lists the sensor technologies. 



Sensor
Advantages
Disadvantages
Applications
Limit Switch Sensor
•High Current  Capability
•Low Cost
•Familiar “Low- Tech" Sensing
·  Requires Physical
Contact with Target
·         Very Slow Response
·         Contact Bounce
•Interlocking
•Basic End-of-
Travel Sensing
Photoelectric
Sensor
•Senses all Kinds of Materials
•Long Life
•Longest Sensing  Range
•Very Fast
Response Time
•Lens Subject to
Contamination
•Sensing Range
Affected by Color
and Reflectivity
of Target
•Packaging
•Material
Handling
•Parts Detection
Inductive
Sensor
•Resistant to Harsh Environments
•Very Predictable
•Long Life
•Easy to Install
•Distance
Limitations
•Industrial &
Machines
•Machine Tool
•Senses Metal-
Only Targets
Capacitive
Sensor
•Detects Through  Some Containers
•Can Detect  Non-Metallic
Targets
•Very Sensitive to
Extreme
Environmental
Changes
•Level Sensing
Ultrasonic
Sensor
•Senses all  Materials
•Resolution
•Repeatability
•Sensitive to
Temperature
Changes
•Anti-Collision
•Doors
•Web Brake
•Level Control

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