What is a NAMUR Sensor?
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- čas přidán 21. 07. 2024
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In this video, we’re going to introduce you to a sensor called a NAMUR proximity sensor. We’re going to discuss how this NAMUR sensor differs from other proximity sensors, and we’ll show you where and why these sensors are used in the field.
NAMUR proximity sensors can be capacitive, inductive, magnetic, or can be photoelectric sensors.
One could be easily fooled by assuming that a NAMUR sensor is a typical proximity sensor because they look very much alike. But physical shape and appearance are the only characteristics they have in common.
Let’s begin by reviewing the electrical characteristics of a typical proximity sensor.
The proximity sensor acts just like a simple switch. When the target is away from the sensor, the switch is open. When the target is close to the sensor, the switch is closed.
In most industrial applications today, a proximity sensor is not connected to an actual load resistance but is connected to an input on a Digital Input Module on a PLC or DCS.
The PLC input will have +24 volts or 0 volts applied depending upon the operational condition of the 3-wire proximity sensor internal switch.
The term “NAMUR” is an acronym for a very long German description.
The NAMUR proximity sensor has been in use for many years but like any electronic device, there are many different symbols in use.
In a nutshell, NAMUR proximity sensors were developed to ensure safety in hazardous locations.
NAMUR proximity sensors are used in classified hazardous location areas that have explosive gas, dust, or fibers present.
NAMUR proximity sensors are considered Intrinsically Safe.
The NAMUR proximity sensor operates much like a typical proximity sensor but does not have an open or closed output condition. Instead, a NAMUR proximity sensor will produce two different and distinct current output levels corresponding to the target position.
NAMUR proximity sensors limit current so that the current is not capable of causing ignition in hazardous atmospheres.
Typical proximity sensors that continually make and break an output circuit could create sparks that could cause an explosion.
Let’s have a closer look… A NAMUR proximity sensor has a switching circuit similar to a typical proximity sensor, but instead of making and breaking an external circuit, the switching circuit is used to change the output current flow by altering an internal resistor network.
Let’s take a look at a real-world example.
There are 4 NAMUR proximity sensors used to measure the shaft speed on four separate chemical pumps.
The pumps are located in a hazardous area, therefore typical proximity/speed sensors are not suitable.
The current output of each NAMUR proximity sensor is detected by an Intrinsically Safe Barrier Converter that provides a square wave pulse train to a Siemens PLC counter module.
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How to Wire Discrete DC Sensors to PLC - Part 2 realpars.com/discrete-sensors...
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#NAMUR #Sensor #RealPars
Nice job! I do these for a living and you did a great job of explaining.
Thanks for your kind compliment, Jim! Great to hear that
Thanks so much RealPars.
You're very welcome - happy learning!
Nice work and great explanatory! And your animations are very detailed and I think that somebody that starts now will be really helped from your videos.
I have a question: why the proximity sensor would create a spark? Isn't it transistor based?
Not all proximity sensors are transitor-based. In the video, we saw that NAMUR sensors are solid-state devices that do not generate a significant amount of energy on switching, and therefore, are suitable for hazardous areas. Electromechanical switches can spark and should not be used in hazardous locations.
I haven't seen proper industrial automation CZcams channel like yours nicely done
Thanks for your support, happy learning!
@@realpars
I work in Turck can you make some videos on RFID IO link and fieldbus
Great explanation!
Thank you, Megan!
Normenarbeitsgemeinschaft für Meß-und Regeltechnik in der chemischen Industrie, let's keep going!
Once again thank you very much.
You're very welcome, John! Happy learning, and feel free to reach out if you have any questions along the way.
Your videos are awesome sir specialy for the working persons in industrial Automation .. plz make one video using TIA hardware and software configuration
Thanks for your kind comment and sharing your topic suggestion with us!
Thank you
Many thanks
Our pleasure!
Thanks
Well done mate thanks
Thank you, Maximos!
Quality of video is unique
Thank you so much, Mohamad!
Thank you Sir 🙏❤🇮🇳
Amazing! Wonderfull! Awesome!!!!
Thanks a lot, Julio!
Please RealPars,
Could you please explain hall effect sensing in dvc 6200 positioner which is used in control valve?
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
@@realpars thanks in advance.
Thanks!
You're very welcome, Nikolay!
The best in the automation world
That's an amazing compliment! Thanks for sharing.
very good.
Glad to hear that!
I love you...!!!! thanks
You're welcome!
Hi thanks for your great training video.
Please make video about analyzer sensors ,like oil and gas analyzer sensors. I working in petrochemical plant and there are a analyzer house for analyzing oil and gas. Thank you and good luck
Great suggestion! I will forward this to our course developers.
Great ❤❤
Nice explanation. I have one doubt. Namur sensor also have switching mechanism. Why it is not creating a spark while opening and closing.
Hi @Prasad R. The switch operation shown in our video is accomplished by an electronic device turning off or on. There's no actual real switch therefore no sparking potential.
Can you make session about control loops like cascade, split range, ratio, feedforward, feedback..
Look up "Basic and Advanced Regulatory Control". Great book covering that stuff.
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Dear sir
Videos is Very helpful but
Kindly one request you
please text should be keep inwhite colour. Block is not visible properly and missing diagrams and very helpful information and pictures.
Thanks for your comment and feedback! I will go ahead and pass this on to our team.
Please upload a video how to upload GSD file is Siemens Step 7 hardware
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
What's the max lenght for the câble ?
Hi there. Thanks for your question. There’s no quick answer. The maximum cable length between a Namur sensor and an IS barrier is determined by several factors such as the type of barrier, and the specific Namur sensor. For example, the input impedance of the IS Barrier must be extremely high to ensure that cable resistance is not a factor. Compliance with relevant safety standards such as IEC 60079 also needs to be consulted.
Please make video on NAMUR NE 43.
Thanks for your topic suggestion, Shiva! I will happily pass this on to our course developers.
Happy learning!
how proximity switches make and break contacts, aren't they supposed to be based on solid state components?
Hi there. Thanks for your question. May proximity sensors have make and break contacts. Unfortunately, make-and-break contacts are not acceptable in some environments. That's where NAMUR sensors are useful as the change of resistance replaces the make-and-break contacts. I hope that answers your question?
@@realpars I mean, how can making and breaking contact in proximity switches cause electrical arcs since they are based on solid state devices they chouldn't cause any risk when they make-and-break
Is this the same as an ATEX Certified Sensor?
no, you can have different type of sensors (pressure, distance, limit switch etc.) all ATEX certified. Note they can have different protection concept (NAMUR being intrinsically safe)
@@zeli There are ATEX intrinsically safe devices marked as ia, ib or ic depending on the zone you use it. So basically NAMUR is something that the rest of the world calls ATEX intrinsically safe device.
Hi, sir! I'd like to learn about safety relay Pilz. Would you like if you help me? Thanks a lot!!!
Hi Julio,
Thanks for your comment, and great to hear that!
We have a whole course library filled with over 400+ video courses. You obtain full access to our complete course library by subscribing to either our monthly package for €22.12 a month or our yearly package for €159.28
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Happy learning!
You might want to explain ATEX sensors too
Hey Todor!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
❤️
Very good explanation but the subtitles are disturbing the videos
Hi Syed,
Thanks for your comment, and glad to hear that you enjoyed this video course! You can turn off the subtitles by clicking on the "CC" symbol on the bottom right of the video screen.
Happy learning!
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you forgot to tell that it is possible to detect wire break with these types of sensors :)
Thanks for adding that, Jan!
could explain more plz
@@benjah2782 if there is no current flowing there is a wire break.
Thanks
You're very welcome!