What is Proximity sensor, and Functions?

What is a Proximity Sensor?
Proximity Sensors is a device that functions as a detector (sensor) changes the distance of an object to the sensor, and generally Proximity can work with the sensitivity of changes in a very small distance, about 1 mm.
What is a Proximity Switch?
Proximity Switch is a type of switch device that can work to connect or disconnect a circuit with the working principle of detecting the proximity of objects to Proximity sensors.

The proximity sensor is just a sensor, which usually must be equipped with a system and then what the sensor results are.

The Proximity Switch is the next process of a Proximity Sensor, and sends signals to automated systems to various other devices.

Proximity Sensor (proximity sensor) can detect proximity (distance) objects made of various materials, both Metal and Non-metal.

Proximity is widely used for automation systems in various industries, because it has excellent sensor accuracy and sensitivity.

Just a little change in the distance of an object from a Proximity sensor, the Proximity sensor will work and send signals connected to various automation systems.

Proximity sensors are only used to detect or know the existence of an object or object, and not to take measurements and so on.

Examples of the use of Proximity sensors that have recently been encountered are:

Proximity sensor on the Android phone sensor.
On Android-based smart phones and touch screens, it is equipped with a proximity sensor (Proximity), when the phone receives or makes a call, the screen is still open until we bring it to the ear, the cellphone will be locked automatically.

Proximity that usually used in this smartpone is the type of Ultrasonic (Photo-electric) Proximity.

Types of Proximity
Based on Proximity working principles and types of censored material, the Proximity Sensor is divided into 3 types, namely:

1. Inductive proximity
This type of proximity has a sensor that works based on magnetic induction, when the sensing area has a metal-like object, then the magnetic induction of the sensor will change, this change in the induction value will state the change in distance of objects that occur in the Sensing area.

Proximity sensor Inductive only detects changes in the distance of objects made of metal, so that the sensor can still work even if the metal is blocked by non-metallic objects, Proximity is usually used for Metal Detectors, and so on.

For example, a proximity sensor that has been installed in such a way, is placed with a type of metal with a certain distance from the sensor.

Proximity will send a signal to the control or automation system, if there is a change in the value of magnetic induction, which can be caused by several factors, including:
  • Previously placed metal objects, have a distance shift, increase far or get closer.
  • There is another metal object, which enters the sensing area of ​​the proximity device.

2. Proximity Capacitive
This type of proximity can be used to detect the distance or proximity of various objects with materials from Metal and Non Metals (Wood, Plastic, Concrete, Glass, etc.).

3. Photo-Electric Proximity
This proximity can be used to detect the distance (proximity) of objects from various types of solid materials, both Metal and Non-Metal.

In addition, the Photo-Electric sensor can be used for sensor objects that are located or have a considerable distance from the sensor position, can even detect changes in the distance of objects over a dozen meters.

Based on the Supply Voltage, the Proximity Sensor is divided into:
  • Proximity Sensor with a working voltage of 10-30 VDC
  • Proximity Sensor with a working voltage of 24-240 VAC

Based on the Output of the Proximity Switch, divided into several types, including:
  • NPN NO Output
  • NC NPN Output
  • PNP Output NO
  • PNP NC Output
  • PNP NO + NC Output
  • NPN NO + NC Output
  • Output NO
  • NC Output
  • Output NO + NC
  • Output Lights On / Off

By knowing the functions and working principles of a Proximity, we can develop their use for various needs, according to our creativity and imagination.

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