Proximity Sensors

Mouhammad Hamsho
A free video tutorial from Mouhammad Hamsho
4.6 instructor rating • 5 courses • 11,277 students

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From Wire to PLC , A Bootcamp In Industrial Automation

Build Electrical Automation Projects From Sctratch. Starting From Wires , Control Circuits And Ending With PLC And HMI

16:54:04 of on-demand video • Updated November 2020

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  • Learn to program PLC in Structured Text (ST)
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  • Design Human User Interface (HMI)
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  • Learn about the different sensors exist in indusrty
English [Auto] Welcome guys in this lecture and now we will be talking about proximity sensors or in the morgue at depth. We'll be talking about capacitive and inductive sensors. Now as the name is states proximity sensors will be activated when an object comes close to the sensor. Unlike the limited switches proximity sensors the objects shouldn't necessarily touch the sensor in order to get the signal. We can work in their range of a few millimeters to a few tens of centimeters and I'm sure that if you look at any factory that has machines you will find one of these sensors fixed at some place in order to detect some product or an object moving. Now capacitive an inductive sensor is specially the proximity one might look really similar from the outside. However from the inside and from a circuit point of view they are totally different. The principle of operations totally different so starting with capacitive sensors. They are used with any type of object. So you can't just put any object in front of them and they will detect it. If they are within a certain range that is usually adjustable through a small screw on the proximity sensor. And as I said their range could be a few millimeters to a few tens of centimeters. And these sensors are digital types so when an object is detected you'll get an digital output of a rating of 24 volt DC or in rare cases you might find that with the rate of 12 volts DC. Now the inductive sensors are only used to detect metallic objects if you put a plastic object a wooden object in front of it. It was detected and it won't give you any output. They also operate on 24 volts or 12 volt DC. Now let's take an example for a capacitive sensor. Let's assume that we have a conveyor band and we have a plastic object moving up of it and the sensor is freak's above this conveyor belt. Now when the sensor is not seeing the plastic object the sensor goes off and it's generating zero for once. The sensor is directly looking at the plastic object. The sensor will output 24 volt DC and then we can take this signal and take some action. Let's say inside a B or C program. Now let's take an example for an inductive sense. Let's say we have for the product and for the product are sensitive to metallic parts so you cannot have metallic parts inside your e-mail. Let's say you owning a production You never know where Forgan or parts might come in and interfere with your product. So you want to make sure that when this water goes to the customer it does not have any fogging parts. One of the methods to detect these spots is to check if there is a metallic parts inside this product. So what we do is we put this food product on the conveyor the band and it goes underground inductive sense or if this inductive sensor senses any metallic part it's gone out with signal all the Sea Org program and say OK this product is a problematic ejected out of this test. So this is it for proximity sensors. Guys see you in the next tutorial.