What is a Pressure Sensor?
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- เผยแพร่เมื่อ 2 พ.ค. 2024
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Today, we will hopefully cover all of the questions you may have about pressure sensors.
To understand pressure sensors, first, you need to understand the pressure. Pressure is an expression of force exerted on a surface per unit area.
We commonly measure the pressure of liquids, air, and other gases, amongst other things. The standard unit for pressure is the “Pascal”. This is equivalent to one “Newton per meter squared”.
A pressure sensor simply monitors this pressure and can display it in one of the several units known around the world. This is commonly the “Pascal”, “Bar”, and “PSI” or pounds per square inch in the United States.
The pressure of the air in your tire is a great example of pressure and how it is measured. As we air the tire up, the force it exerts on the tire increases, causing the tire to inflate. This is monitored with a pressure sensor inside the tire on newer vehicles.
So how does a pressure sensor work?
In a nutshell, it converts the pressure to a small electrical signal that is transmitted and displayed.
These are also commonly called pressure transmitters because of this. Two common signals that are used is a 4 to 20 milliamps signal and a 0 to 5 Volts signal.
Most pressure sensors work off of the piezoelectric effect. This is when a material creates an electric charge in response to stress.
This stress is usually pressure but can be twisting, bending, or vibrations. The pressure sensor detects the pressure and can determine the amount of pressure by measuring the electric charge.
Pressure sensors need to be calibrated so it knows what voltage or milliamp signal corresponds to what pressure. This is a basic “Zero” and “Span” calibration or minimum and maximum which is a common job for maintenance personnel.
In the RealPars video “What is Sensor Calibration and Why is it Important?” we described the sensor calibration in detail.
realpars.com/sensor-calibration/
What are some of the common types of pressure that you can measure with a pressure sensor?
There are three common types that we use in the industry. First being “Gauge Pressure”.
This is measured in reference to atmospheric pressure which is typically 14.7 PSI. You will show a “positive” pressure when it is above atmospheric pressure and a “negative” when it is below atmospheric pressure.
The next type is “Absolute Pressure”. Simply put, this is the pressure as measured against absolute vacuum. A full vacuum will have an absolute pressure of 0 PSIa and increase from there.
If you need to read a pressure that is lower than atmospheric pressure, this is the type of sensor you would use.
The last type that is commonly monitored in the industry is “Differential pressure”.
This is exactly what it sounds like, the difference between two pressures, a pressure being measured and a reference pressure.
In industry, pressure sensors are used for a wide variety of processes. Some common uses are to measure the pressure of steam.
Steam is commonly used to heat many processes in manufacturing facilities. This pressure sensor on the steam system can serve multiple purposes though. First and most obvious is to observe and monitor the pressure.
Another purpose is to control when and where steam can flow and regulate its pressure. Steam can build up pressure in a vessel and become dangerous.
We can use the pressure sensor as an input device to open and close a control valve to keep the pressure and steam flow regulated. This only requires simple programming in the PLC to achieve this.
Pressure sensors are also installed next to filters in many industrial processes. If the filter begins to clog, the flow will decrease. As the flow of the liquid decreases, pressure can increase or decrease depending on which side of the filter is monitored.
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What is Sensor Calibration and Why is it Important?
realpars.com/sensor-calibration/
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The Best Man....i learned a lot on this Channel...
Awesome video, just had a related issue at our plant.
Our feed-water tank, for the boiler, has a DP sensor that determines the water level. The lower port was clogged causing a false high reading in the feed-water tank. We never got makeup water, and the boilers tripped. All that rust build up at the bottom of the tank clogged our reading!
Now we have a blow down installed, to keep those ports clean.
Keep up the awesome work, I'm learning more every day!
Thanks for your support! And for sharing your thoughts and experiences. Let us know if you have any questions!
Thanx RealPars for creating and sharing these useful videos
You are very welcome!
Thanks RealPars team, you are the best. you have immensely contributed in enhancing my Instrumentation and Control skills. Keep it up.
Thanks for your kind comment, Ejimaji!
Really they are the best ..
Really thanks to them , big efforts
@@realpars the
Hi Realpars team,
Great work.. thanks a lot for your educational videos. They are quite clear to understand.
One request kindly make videos on the electronics used inside instruments.
Great to hear that, Mouiz! Happy to hear that. I will surely sent your topic request over to our creator team. Happy learning!
thank you so much #RealPars for all of your very informative videos,,, even i didn't finished my engineering course, your videos was helps me a lot and then i applied it from actual at work.. more power to you RealPars,,.
merry christmas and a happy new year to all the staff of RelPars..
Thanks for all your support! Amazing to hear that.
We wish you a very merry Christmas as well!
i spend all my free time on RealPars video tutorials,. very well precisely said explanations.
☝☝☝☝☝☝☝☝☝☝🌠🌠🌠🌠🌠🌠🌠🌠🌠🌠
Great video, it's really helpful for me, thanks.
You are very welcome! Happy to hear that!
Very informative video. From the scratch, what is Pressure sensor, how does it work and what are types of Pressure sensors, all this is explained very well with the creative diagrams. Very useful for the students who are studying industrial automation.
A Pressure sensor is a device that catches the pressure and manages to change it into an electronic signal where the quantity depends upon how much pressure appealed.
Keep sharing such videos. Thank you.
Thanks for sharing! We appreciate your support
Thank you so much sir
شكرا على الترجمة ❤
Thanks a lot.
Great job.
Go ahead.
You are very welcome! Thanks for your support.
Good video.It's useful for novice
Thanks a lot for those useful videos
Glad you like them!
Thanks for the video sir. Its very usefull to me.
You are very welcome!
Love you guys
Realpars is a bright star in automation technology and our best resource for learning (thank realpars)
Great to hear that, Derin! Thanks a lot!
Agree
very informative video..please bring a video on bin level sensors...
Thank you! I will ask our creator team to put this topic on the list.
Awesome explanation
Happy learning! :)
@Realpars thank you very much for the explanation, I am doing Internship at Endress Hauser so lot of things are clear now
Glad it was helpful! Best of luck with your internship!
Thank you so much. All videos are just perfect, I can’t imagine how it could be better. Keep doing, congrats!
Many thanks for such a nice comment! Happy learning! :)
Hello Realpars, you are doing great job.... I'm mechanical engineer and have less knowledge of electronics components. But by watching your videos it would be easy to understand the mechatronic systems
Hi Vishal! Thanks for your kind comment. Comments as such always make us very happy! Keep up the learning curve!
Great illustration
Thank you!
Thank you also, my dear teacher.
Nice Job !!
Thank you, Kevin!
Very informative.. Good
Thanks a lot, Zuhaib!
Thanks alot ' keep going 🌹💌✋🏼
You are very welcome! Happy learning!
You are so awesome guys.
Thank you, Luis!
Thank you video is very good.
Great to hear, Abu! You are very welcome.
thank you video is very useful
Happy to hear that! You are very welcome.
Long time no watch your videos
Thanks for share
You are very welcome!
Thanks...good video
Thank you!
Very nice and helpfull video
Great to hear, Rajeev!
Thx
Thanks from China ❤
Thank you sir
You're very welcome!
Thanks,
Sir can you please explain to us "ETS" District cooling system
Hey Abdul!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Hi guys, did you already made a tutorial were you programm a PLC to obtain these pressure in a .csv file? or a motor torque for example
No, but I will pass your comment on to our development team.
Good video 👌
Thank you!
Your videos are very explanatory and take many doubts, you could by subtitles in Portuguese, because I have difficulties with English, I already thank you
Thanks for your support, Isaias! Unfortunately, we only have subtitles in English at the moment. Sorry about that!
Realpars, very very very professional explication and working . and all this vedio is just sam of big structure knowledge .thank you all for your hard work. i recommend to buying cours
Thanks for your kind response, Abdelkabir! Happy learning!
Amazing tutorial 👏🏿
Thanks for your support, Sharifski!
Subscribed 🙌
Great!! :)
Nice
Sir is it posible to put a pressure sensor and valve together to form self-acting pressure control valves?
Absolutely! There are a couple of ways to do this. First, they make self-regulating pressure control valves, which are set by a pilot signal or a set screw. If you need to connect the pressure transmitter and the valve to a control system, there are a number of "smart valves" that are on the market to which a pressure transmitter can be directly connected and for which the control algorithm is executed inside the valves electronics. Many times these valve electronics are called "smart valve positioners".
Can you make other sensors videos and more detail about the each sensor
Hi Rohit,
Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!
Dear Mr.Kevin/Real Pars,
Could you please explain the math of level derivation with an example.
and also please explain about in detail / layman terms regarding "Hydro static Pressure" means.
Thanks in advance
Best Regards,
Poorna Chandra Raju B
Hi Poorna!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
I have been thinking about this for so long and I need a good answer, when do we use a pressure switch and when do we use a pressure transmitter?
Pressure transmitters could be used anywhere a pressure switch is used. However, pressure transmitters are larger, more expensive, and require analog cards in the PLC or converter circuits. So, pressure transmitters are used when you absolutely need to know the exact pressure in a line or vessel for pressure control, level detection, or flow metering using a differential pressure flow element. Pressure switches are used where I only need to know if the pressure has risen above or fallen below a set value.
Good question with a good answer, thanks realpers
Can you put a vdo for level measurement by using the pressure sensor
Hi Ashik!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Hi ashik...... Try this... th-cam.com/video/ylhwPcyieTc/w-d-xo.html. It is one of our videos about using a Differential Pressure Transmitter to measure level.
What are the possible reasons of tripping a pump in SCADA System?
There are many reasons that can be programmed into the PLC, but a few commons reasons are: loss of feed (low level in tank, low suction pressure), over-current on motor, and loss of other interlock (local disconnect, pump enable, etc.)
Very good video. I believe that the typical voltage range would normally be 1 to 5 volts, not 0 to 5 volts because we always want some minimal signal right?
Although 0-5V and 0-10V are used, 1-5V and 1-10V are more often used for sensing. 4-20ma is the most used because the range of a current signal is much longer (1000m) than a voltage signal (15m). Using 1-5V instead of 0-5V gives a "live" zero (which you referred to), making it easier to troubleshoot wiring and hardware issues.
Super 👌👌👌 sir thanks
Thank you, Mohamed!
Amazing work! ...love from India!
Thanks for your support, Sampath!
Do you have a course about allen bradly rslogix 5000 v 30
Hi Alqarib,
Thanks for your comment!
Although we mostly focus our course videos on Siemens, we do have a couple of course videos on Allen Bradley. Feel free to have a browse through our course library to see which topics we cover at the moment. bit.ly/30ZrxWq
Happy learning!
How about a video on fiber optic sensors?
Thanks for the suggestion! I have forwarded it to our creator team, hopefully we can put it on the list soon!
Wonderful Tutorial sir. Waiting for much such videos.
Thanks for your support, Andrews!
Please provide other payment method in real pars website subscription. Because I was completed my automation course and I don't have credit card and I want to learn more plc programs.
Hi Prayeen, we currenty only accept these major debit & credit cards: Visa, MasterCard & American Express. Sorry about that!
What is the equation to determine the level of the liquid with size and gravity ?
Thank you
Hello Hassan Sahmoud,
Thank you for your question. This is a good question, but it can’t be answered with one common equation. In our video, we discussed 3 units of measurement for our example. The Pascal, Bar, and PSI measurements have different equations depending on the measuring device you will use to monitor your system. And factors like the type of liquid, size of pipe or vessel you are using to move your liquid, and of course, the gravity used in your area. Therefore, unfortunately, there is no one equation I can give you. Here are some links you might what to explore to help with your question. And of course, you can also view some of the REALPARS TH-cam videos depending on the subject you want to learn more about.
th-cam.com/video/iru8tRwS7Yc/w-d-xo.html&lc=UgyBr781CbdOKhSGeZJ4AaABAg
www.omega.com/en-us/
Happy learning!
@@realpars i opened a link but it says nothing 😅
I think u mean this law
P = ghq
Where q is the density
h is the level
g is the gravity
Am i right ?
we measured pressure in closed equipment. ..is it Guage pressure or absolute pressure?..plz answer
Typically, in the case you describe, the measurement would be gauge pressure. It ultimately depends on the reference for the "low side" pressure reference, whether it is the atmosphere (gauge), another point in the process (differential), or vacuum (absolute). Absolute pressure sensors are constructed with an enclosed vacuum chamber and are more expensive than other pressure sensors and not as common. You will need to inspect the model number and vendor literature to make certain of the type of sensor you have. If there are two connection ports visible in the sensor body, it is a gauge (or differential) pressure sensor.
@@realpars Thanks a lot❤
Thanks!
You are very welcome, Kostas!
Nice video styling. are you using the adobe creative cloud? Illustrator, premier pro, after effects???
Hi Mensor,
Thanks for your compliment, we truly appreciate that!
I am actually not sure about this as this is done by our graphic and animation department.
Sorry about that!
Hi Real-pars Team, You are doing well. Keep it up, I want to ask you that what SIEMENS software, I should have for PLC learning/Training Purpose, & how I can get it. Thanks & Regards.
Hey Ahmed!
Thanks for your comment! We have a couple of links through which you can download different versions of STEP7
sie.ag/2eH6GEM
sie.ag/2Jt80F0
Happy learning!
❤️❤️❤️❤️❤️❤️❤️
I'm trying to figure out how those electronic piano floor mats work. Somebody told me it has to do with pressure sensors. Can you explain how pressure sensors are used in those things, if that is the case?
Thank you for your comment, Hayden! This question would make for a great video course, I will go ahead and forward this to our course developers as a topic suggestion.
Thank you for sharing!
@@realpars I am a blind man who enjoys collecting toys. I have a few of those piano mats, but I don't want to risk perminantly destroying one just to find out how the sounds are triggered when you step on certain places.
👍👍👍
Request sir please with subtitles
Hi Gunadhar, we only have subtitles in English at the moment. Sorry about that!
Sir please make video regarding force Torque sensor.
Hi Anil,
Thanks for sharing your suggestion with us! I have sent this over to our course developers.
Happy learning!
I would like to have Thai subtitles.
Hi,
Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Our apologies for any inconvenience!
Happy learning!
usefullllllllllll
Great to hear, Ali!
now i have complete control
Good work I subscribe your channel and you also
Thank you very much!
Love you guys