Posted tagged ‘photoelectric sensors’

How to Choose a Photoelectric Sensor

June 23, 2015

Photoelectric sensors may seem rudimentary to a lot of people out there especially if you’re a seasoned vet. If you’re a new guy it may seem a little daunting since there’s so many different options, so many different shapes, sizes, options available, and boy if you pick the wrong one you’ll know it quick. It can definitely be the difference between being a stable logic program that depends on that sensor to make decisions, and also just the stability of the throughput on the line. So you really want to make sure you pick the right photo electric sensor, and it’s not rocket science as there’s really 3 basic types of photoelectric sensors.

The first type is a through beam sensor, which is basically an emitter and a receiver that just look right at each other. So, if you break the beam there’s an output, or there may be an output whenever the beams see each other. That’s one way to look at it.

There’s also what’s called retroflective and that’ll be where you use a reflector and a sensor. The sensor basically sees its light source bounce off the reflector and come back to the receiver that’s in the same housing.

The third type is diffuse reflective which requires no sensor so the light will bounce off the object and come back into the receiver itself.

The differences between the three typically are gonna affect your sensing distance and also it can really hinge on the reflectivity of the object that you are trying to sense. So really you just need to take a look at your application, the mounting location of the sensor, how far away you can be or how close you can be to the object your trying to sense. Those factors can really help determine which one of those 3 are going to be the best for you.

There are different light sources inside of the sensor and that can affect the sensing distance. It can also affect the stability of the signal, and also in certain environments where there can also be contaminants in the air or light pollution, external light pollution that affects the receiver, you might need a different light source to mitigate some of those. Your typical light sources that you’re going to find in today’s market are gonna be LED lights, infrared lights, laser lights, and every now and then you’ll run into an application that calls for an ultraviolet light inside of a sensor. And again that’s just gonna affect the sensing distance, the stability, things of that nature.

Really the number one thing I can recommend when trying to find a sensor and make sure that it’s right is to get a sample and test it, and retest it, and test it with different types of sensors and different types of environments. Always remember to test for the extreme. Don’t test under normal operating conditions because if one day it’s cloudy out or one day the sun is right in your eyes, if you didn’t test for that, if you were just testing for the normal operating environments you’re gonna get an unstable signal. So always test for the worst case scenario, the extremes are what you really want to look for. Another good rule of thumb if you can, is to try to use models with quick disconnects on the back. That’s a major plus for your maintenance staff whenever you need the ability to change a sensor quickly without having to replace the entire wire all the way back to the cabinet it’s wired into –  that’s why they designed these. And most sensor manufacturers are going to give you the option to either have a flying lead coming out of the sensor or on the back end of it you’ll have a little M12 or M8 through your 4 pin quick disconnect that this can just hook right into.

And so like I said it’s not rocket science, just make sure that you test. I can’t stress enough how many times people think that they know that a sensor will work in an application, they never tested it, and then we get a call saying they need to return the model for a different one because for some reason it didn’t work for one reason or another that would have been easy to test. Omron even manufactures a checker, which is basically a DC power supply that you can wire a sensor into with a little light output that tells you when the output of a sensor turns on. You can even turn on a little buzzer so it’s really handy to be able to hook up a sensor, go out on your line and just start testing stuff and see when you get your output and make sure its stable.

If you have any questions, you need help with this, there’s always new sensors coming out, all kinds of new technology that makes them more powerful, gives them extended range, and that’s something Innovative-IDM can really help you with because it’s our job to know that kind of stuff and to be able to help you with any applications that come up. We also have a sensor specialist we can bring in if necessary, you can also find a lot of this information on our website which is innovativeidm.com. Go to our Knowledge Center, where you can find white papers for our different types of sensor applications and best practices. After all we are Home of the Legendary Customer Experience.

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How Capacitive, Inductive and Photoelectric Sensors Work

May 12, 2015

Hi, I’m Adam Ring with Innovative-IDM. You know, I was just teaching a class last week and a topic came up about different types of sensors that are used for industrial automation. So I thought, well, I’ll take a few minutes and go over some of the basics of how these types of sensors work.
The first thing I would like to talk about is the inductive proximity sensor, these are very widely used in automation, they’re used to sense various metal objects. So, basically any kind of metal objects that we need to know that’s present or absence or is there a part in place, is that part missing? Is an actuator retracted or extended? Anyway in which we need to sense something that is a ferrous metal we can use this.
Basically what it does, it has this tractor beam that emits from the tip of the sensor, and it’s really what we call an eddy current killed oscillator. What that means is that, there’s this electrical field generated outside the tip of this sensor, and when a ferrous object comes near-by, it actually absorbs that field and the sensor is then able to detect that there is something there and it gives us a signal.
Another type of sensor that is similar to the inductive proximity sensor is the capacitive proximity sensor. This uses a different sensing technology, in that, instead of looking for a ferrous metal object, it actually looks for a difference in the capacitance of an object. So, in other words, how much does it absorb electricity and so, a real common application for this is that we can mount this on a plastic tank that contains water. And we’re able to detect the level of water that’s inside the tank. So it can actually look through the outer surface, and see the material that’s in, as long as the capacitance properties of that material are different enough from the outer material, to where we can just tune out what that outer material is and figure out “Hey, is there something inside or not?”
Then we have another really common type of sensor that is used in automation; that’s called the photoelectric sensor. As its name implies, it basically uses light in order to detect objects. Something like this has an emitter and receiver, so it emits a light beam and it bounces off of an object and comes back to the receiver and if it sees the light, then it knows that there’s an object there. If it doesn’t get an object back, then it knows that there’s nothing there. So it’s able to easily detect when there’s an object present or absent. Real common use for these is on conveyors, if you want to detect if there’s a box moving on a conveyor, and as soon as it passes by, the photo eye reflects the light and says that object’s there. Very common use in the industry.
If you’d like to learn more about these types of sensors and others, please take a look at the Innovative-IDM knowledge base, our website is innovativeidm.com, and we’d love to share some information with you. Remember, we’re Home of the Legendary Customer Experience.

Omron Sensors Training in Houston June 13

May 28, 2013

Industrial Sensors Training coming to Houston! Learn about photoelectric sensors, proximity sensors, limit switches, measurement sensors and more. You will even learn about how vision sensors and systems can help your efficiency and QC. HANDS-ON learning for the applications in your facility.

Omron Sensors Training Houston
June 13, 2013
8:30 a.m. to 4 p.m.
Innovative-IDM Training Room
13770 Hollister Road, Suite 100, Houston, TX 77086
$199 (includes catered lunch)

How can using the proper sensors correctly help you and your line? This is where you’ll learn. Be the SENSOR EXPERT at your facility.

Register today for the Houston Omron Sensors training class – contact us at marketing@iidm.com or give us a call at 877.906.2100.  View our full 2013 training schedule on our training website.

Houston Omron Sensors training June 13

Discontinuation Notice – Omron E3S-R Photoelectric Sensors

July 13, 2012

E3S-R Discontinuation

Omron E3S-R Transparent Object Detection Photoelectric Sensors will be discontinued in March 2014.  Recommended replacement for these Sensors is the E3Z-B or E3ZM-B.  Click here for more details and a list of affected parts and their recommended replacements.

Ready to upgrade your Transparent Object Detection Photoelectric Sensors?  Call Innovative-IDM at 877.906.2100 or send us an email at info@innidm.com

Omron Sensors Training DFW May 21

April 30, 2012
Coming to DFW! Another great career-enhancing class.  This time, it’s industrial sensor training.  For $199, you’ll learn about photoelectric sensors, proximity sensors, limit switches, measurement sensors and more.  You will even learn about how vision sensors and systems can help your efficiency and QC.  HANDS ON learning for the applications in your facility.  Lunch is included.
Omron Sensors Training DFW
May 21, 2012  8:30 a.m. to 4 p.m.
Innovative-IDM Training Room
$199 (includes catered lunch)
How can using the proper sensors correctly help you and your line? This is where you’ll learn. Be the SENSOR EXPERT at your facility. Click here for details!

This is a one-day class with no chance of adding a second day.  To reserve your seat, give us a call at 877.906.2100 or send us an email at info@innidm.com.

Omron Sensors Training Houston May 17

April 26, 2012
Coming to HOUSTON! Another great career-enhancing class.  This time, it’s industrial sensor training.  For $199, you’ll learn about photoelectric sensors, proximity sensors, limit switches, measurement sensors and more.  You will even learn about how vision sensors and systems can help your efficiency and QC.  HANDS ON learning for the applications in your facility.  Lunch is included.
Omron Sensors Training Houston
May 17, 2012  8:30 a.m. to 4 p.m.
Innovative-IDM Training Room
$199 (includes catered lunch)
How can using the proper sensors correctly help you and your line? This is where you’ll learn. Be the SENSOR EXPERT at your facility. Click here for details!

This is a one-day class with no chance of adding a second day.  To reserve your seat, give us a call at 877.906.2100 or send us an email atinfo@innidm.com.