| Purpose |
Determines the speed of a rotating (or) moving object. |
Determines whether an object is present or absent without making direct contact |
| Primary Output |
Speed (usually measured in RPM or m/s) |
Digital presence/absence or analog distance |
| Working Principle |
Utilize electromagnetic, Hall effect (or) optical methods to sense motion. |
makes use of optical, ultrasonic, capacitive, or inductive sensors |
| Typical Output Signal |
Frequency or voltage in proportion to speed |
Analog voltage or an on/off signal |
| Application |
Monitoring motor speed, Vehicle speed sensors and Conveyor belt monitoring |
Detecting objects, Counting objects, Position sensing and limit switching |
| Example |
A crank-shaft speed sensor in an engine. |
Metal components on a conveyor are detected by an inductive sensor. |
| Detects Static Objects? |
No, only works with moving objects. |
Yes, it can identify moving or stationary objects. |
| Contactless Operation |
Yes |
Yes |
| Sensitivity to Target |
sensitive to the motion only |
Insensitive to motion, but sensitive to proximity |
