Proximity sensors are a subgroup of position sensors. Unlike many position sensors, proximity sensors do not need to touch their target to function.
For example, in a bottling plant, beverage bottles used to trip a mechanical limit switch during counting. Now a proximity switch can provide the same information without using a mechanical device that will eventually wear out.
A proximity sensor is used to detect the physical presence or absence of a target object within their nominal range.
Because they don't require touch, and usually have no moving parts, proximity sensors should have long lifespans without intrinsic reliability issues. This makes them very popular for all kinds of automation. You might find a proximity sensor
As we examine these broad categories of sensors, we'll also look at some vulnerabilities of each sensor type. In many cases, sensor manufacturers have come up with clever methods to reduce these vulnerabilities, often by using additional components and specific setups tailored to the exact sensing job at hand. So when learning about generalized flaws in each sensor type, remember that these issues can sometimes be mitigated.
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