What is a Level Sensor?

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Industries use several different types of level sensors to detect their products. In this video, we are going to talk about the different types of level sensors used in the industry.
Level Sensors can be broken into two classifications, point level measurement, and continuous level measuring.
Point level measurement indicates when a product is present at a certain point and continuous level measuring indicates the continuous level of a product as it rises and falls.
The sensors for point level indication are “Capacitance”, “Optical”, “Conductivity”, “Vibrating” (Tuning Fork) and “Float Switch”.
The sensors for continuous level measuring are “Ultrasonic” and “Radar” (or Microwave).
A capacitance sensor is a proximity sensor that gives off an electrical field and detects a level by the effect on its electrical field.
These sensors are small, less expensive than other sensors, invasive to the product, accurate, and have no moving parts. However, they do have to be calibrated and will only detect certain liquids.
Capacitance sensors can be used in liquid storage tanks. A water treatment facility that has storage tanks would be an ideal use for a capacitance sensor.
The next point level sensor we will talk about is an optical level sensor. Optical sensors work by converting light rays into electrical signals which measure a physical quantity of light then translate it into a measurement.
These sensors have no moving parts, they are not affected by high pressure or temperature, are small in size, and can be used in liquid applications.
Another style of point level sensor is conductivity or resistance. A conductivity or resistance sensor uses a probe to read conductivity. The probe has a pair of electrodes and applies alternating current to them.
When a liquid covers the probe its electrodes form a part on an electric circuit, causing current to flow which signals a high or low level.
The advantages of using a conductivity level sensor are there are no moving parts, they are low cost, and fairly easy to use.
The disadvantages are they are invasive, meaning they must touch the product being sensed, they only sense conductive liquids, and the probe will erode over time.
Vibrating or tuning forks is another type of point level sensor. They use a fork-shaped sensing element with two tines. The fork vibrates at its natural resonant frequency. As the level changes, the frequency of the fork will change detecting the level.
These sensors are cost effective and are also compact. They are invasive to the product, meaning they have to touch the material to sense the level. These sensors are easy to install and are essentially maintenance-free.
Float switches use a float, a device that will raise or lower when a product is applied or removed, which will open or close a circuit as the level raises or lowers moving the float.
The advantages of a float switch are that it is a nonpowered device, it provides a direct indication, and they are inexpensive.
The disadvantages are they are invasive to the product, they have moving parts, and can be large in size. Float switches will only give an indication for a high or low level they cannot measure a variable level.
ultrasonic sensors work by emitting and receiving ultrasonic waves. The time it takes for the waves to reflect back is how distance is measured.
These sensors have no moving parts, are compact, and reliable.
The disadvantage of using this type of sensor is that they can be expensive and in some situations, the environment can have a negative effect on them.
The benefits of ultrasonic sensors are that they are non-invasive, or non-contact, they are unaffected by the properties of the material they are sensing, and they are self-cleaning because of the vibrations they give off.
Radar or microwave is also a continuous level sensor.
These sensors transmit microwaves by an antenna on the radar sensor.
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#RealPars #LevelSensor #LevelMeasurement

[@user-wk7lp1eq9r]

Appreciate what you do. Very interesting and helpful for students from Belarus!

[@realpars]

Great to hear that! Thanks for sharing your support.

[@jfraunity7925]

Thanks for your very clear lectures.

[@realpars]

You're very welcome, Zahir!

[@saskiavanhoutert3190]

Thanks for the explanation, now I know what can be used in tanks etc.

[@realpars]

You are very welcome, Saskia! Happy learning!

[@macmos1]

Also, this is a fantastic channel-- extremely relevant in my job.

[@realpars]

Thanks for sharing your positive feedback with us, Marco!

[@nocoselelomaqoboza2351]

instrumentation ?

[@suhaibsamanige549]

Grear explanation. I love it

[@jimbass924]

Excellent video, informative, challenging and great summary

[@realpars]

Thanks a lot, Jim!

[@justengineering7602]

Thank you for making this informative video. very useful video for students doing industrial automation. All types of level sensors are explained very well expect free space radar, guided wave radar, capacitance, gamma pressure sensors that comes under continuous level measurement. Keep posting such videos.

[@realpars]

Glad it was helpful!

[@flow5718]

VW and Audis use a potentiometer to measure the fuel level.The voltage output of the sensor changes as the float (potentiometer arm) goes up and down.

[@darbarisid]

Very nice video.. I was confused about capacitive type.. was thinking it can be continuous but was shown as point type.. but one of the comments cleared my doubt that it can be used as both..

[@realpars]

Happy to hear that the comment section is helpful as well! Great students are leaving insightful comments all the time. Happy learning!

[@FeejoyTechnology]

Radar level transmitter is a very powerful sensor which is suitable for a wide range of applications and media,you presented clearly,let me fully understand radar level transmitter,I will keep you in my thoughts and hope to get your attention as well.

[@roger72715]

Excellent presentation. Great channel.

[@realpars]

Thank you, Rondeep!

[@akhileshgupta8849]

informative for interview preparation. thanks

[@realpars]

Thanks a lot!

[@shanmugamn2016]

Good explanation 👌👌👍.. Thank you 😊❤️

[@k50159]

Awesome tutorial. Thanks a lot

[@realpars]

Thanks for your support, Sharifski!

[@sushilgharat2264]

Great video for learner's like me.. Thanq RP.. 😃

[@realpars]

Happy to help!

[@enriqueramirez8618]

Excellent video, an easy way of explaining the variety of sensor. I decided to subscribe to your courses and I hope to improve my abilities in programming.

[@realpars]

Great to hear that, Enrique! Welcome to the RealPars family!

[@martinmukangwa5050]

I like realpars videos...its an educative channel

[@realpars]

Happy to hear that, Martin!

[@solutionsgalore1760]

great teaching...learnt a lot

[@realpars]

Great to hear that, Dennis! Happy learning!

[@najeebkhanswat]

Thank you for the lesson

[@realpars]

You are very welcome, Najeebullah!

[@hyacinthtatang4427]

Thank you sir. The information is very useful.

[@realpars]

You are very welcome, Founui!

[@aniketkamble3236]

Very informative, thanks!

[@realpars]

Our pleasure, Aniket!

[@PRNadh]

Greatly helpful in daily life.

[@realpars]

That's great to hear! Keep up the good work!

[@WayneRiesterer]

Fantastic videos as always. Thanks :)

[@realpars]

Thank you very much!

[@chaurasiyaarunkumar]

Thanks for helpful information.

[@realpars]

You're very welcome, Arun!

[@suriasaran5050]

Nice explanation.. From India....

[@realpars]

Great to hear that, Suria! Happy learning!

[@ahmedsafwat2373]

very helpful explanation great effort from you guys thanks

[@realpars]

Great to hear that, Ahmed!

[@sajid4upn]

Excellent explantation

[@realpars]

Glad you liked it

[@nguyenthanhlong8205]

such a useful knowledge for Automation field, from VietNam

[@realpars]

Great to hear that! Thanks for sharing that with us.

[@EkcommanMan-hc4vd]

Thank you so much sir

[@mujeebahmadkhan9996]

Found your channel to be really helpful to me. Thanks a lot for sharing with us. Your new subscriber.

[@realpars]

Awesome, thank you!

[@pranitadalvi2409]

This was fabulous ..🤘 Please make a video on Pressure measurement units

[@realpars]

Hi Pranita, thanks for your support and for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@hosseinvaziridoghozlu1183]

Comprehensive and excellent

[@realpars]

Thanks for your support, Hossein!

[@creativeeee]

nice and so informative video

[@ibrahimalabyed2576]

Best channel on youtube

[@realpars]

Thanks for your support, Ibrahim!

[@waymamma]

Love your videos, they are very informative. Thank you! You mentioned capacitance sensors fall under the point-level category, but technically they are capable of continuous level measurement as well. The Siemens SITRANS LC300 for example does continuous level measurement. Small point (pun intended) but worth mentioning :)

[@realpars]

Richard, thank you for your comment. Yes, there are capacitance level sensors designed for continuous level measurement as well. These sensors work on the principle of inverse frequency shifting capacitance detection, and they provide excellent level measurement for a wide range of liquids. Again, thanks for the feedback!

[@waymamma]

Thanks for the reply. I work in R&D for one of the industry leaders in level measurement, though we don’t do Capacitance here in my lab any longer we focus on ranging technologies (ultrasonic and radar). I’ve seen some of the math used in the continuous capacitance transmitters and it’s indeed quite complex, though possible even with 8-bit MCUs which is pretty cool. Keep up the fantastic work!

[@wowvideos920]

Great material.

[@realpars]

Thank you!

[@rixpanapasa8977]

awesome stuff..thanks for sharing 👍

[@realpars]

Thank you! Happy learning!

[@amrouche.abdesselam]

I didnt't regret by pushing the subscribed and the notifications button Great video RealPars!! Could you please do a video about As-Interface ?

[@realpars]

Great to hear that, Amrouche! Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@TheKash40]

Very precise video on LTs 👍 kindly make a video if possible on "pull rope type LT", how to perform maintainance and calibration.

[@realpars]

Hi Kashu, Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@ElectricityAndEnergy]

very useful explanation , Great Graphics 👌👌👌

[@realpars]

Great to hear that! Thanks a lot.

[@weizhang3513]

Our company is mainly engaged in liquid level sensor products. If you are interested, please go to our company's official website to check relevant products. Web:www.level-measure.com E-mail:[e-mail] Call:15896421004

[@sameersalem1827]

Great work thank you very much.

[@realpars]

You are very welcome, Sameer!

[@sameersalem1827]

💐

[@ai5573]

Capacitive level sensors can be used for continuous level measurement just as well, as far as I'm aware. There're couple more ways of continuous level measurement that would be worth mentioning: magnetostrictive, reed chain, guided wave radar, and using pressure sensors (single sensor for hydrostatic pressure in open tanks and two sensors for differential pressure in closed tanks). iId like to see some examples (even without brand names), reflecting how the common characteristics of different types of sensors are compared to each other (e.g. accuracy), and in whaat use cases you'd want to pick one vs. the other. I'd be especially interested in what can be used in battery-powered IIoT applications, i.e. to compare the power consumption characteristics, initialization time and time it takes to perform the measurement.

[@realpars]

Yes, these are all excellent ways of measuring level. Guided wave radar is gaining in popularity because of its ability to overcome issues like foaming, and it is also very good for detecting interface levels. It is a wetted-type sensor, so materials of construction are important. Also, for tall tanks, it may require a clevis piece be installed in the bottom of the tank to avoid sway and impacting internals, such as agitators. Magnetorestrictive is very popular in oil/gas applications, especially for level gauge applications. Differential Pressure is by far the most-used method due to its low cost, relative ease of installation, and accuracy. And as you indicated, capacitance level measurement is excellent for continuous level measurement, especially for viscous and sticky materials.

[@user-bx3cf7gp1u]

ثف

[@user-bx3cf7gp1u]

قليلا في ٣فبراير قراءة فنون ٤٧٥فبراير حوادث السيارات رياضة ولاعبين الافلام العربية ٥٥في الافلام العربى ١

[@user-bx3cf7gp1u]

​@@realpars ج

[@abdessamadhajji3367]

You can also use pressure sensors to measure level of a tank

[@EngASax]

yeah, that's very fairly common.

[@alikhanzulkashov4438]

You are probably talking about differential pressure transmitter

[@simoessmithlimakevan1803]

It isn't a differential pressure, he talk about a static pressure where the measurement is P= volumic mass of the fluid(rho)*g* h so, livel is : h= P/rho*g

[@harshitsrivastava7700]

Differential Pressure Transmitter

[@techs5384]

It’s so good to see these videos, not the drunken live streams. Keep to the format

[@realpars]

Thank you!

[@labhsingh1615]

Thanks you sir for this video

[@realpars]

You are very welcome, Labh, thanks for your comment!

[@waseemlucky7331]

Excellent job sir ..... awesome ........ superb .... amazing

[@realpars]

Thanks for your support, Waseem! Happy learning!

[@waseemlucky7331]

@@realpars My pleasure Sir ....

[@mrhuy5204]

An useful video and thanks for sharing :)

[@realpars]

Glad it was helpful! Our pleasure!

[@jorgetobiasrevuelta9888]

very useful! as always...

[@realpars]

Thank you, Jorge! Happy learning!

[@Planet-of-the-Gibbons]

Great! I know better now.

[@chunkyjungle]

As mentioned below there are other types but one that is not mentioned is laser level transmitters. They are continuous and compete with thru air radar and ultrasonic. Mainly used for solids applications but can measure liquids even clear liquids. The downside is that they are an optical device so the lens has to stay clean. There are accessories to help overcome these challenges though i.e. dust tubes, purge rings, built in heater for the lens, etc...

[@realpars]

Great comment! Thanks for sharing your knowledge with us!

[@ashikazarudeen508]

Your contents are very awesome & helpful. Could you please put a video about the initial configuration of radar & Ultrasonic level transmitters

[@realpars]

Hi Ashik! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@MrDawen1997]

Best channel on youtube ! ps: could you do a video about structure text programming in TIA portal?

[@realpars]

Hey! Thanks for sharing your suggestion with us! I have sent this over to our course developers. Happy learning!

[@chituantran5794]

I would like to state that why do I not find out this channel soon. Thanks admin this channeel, enjoyable. 🥰🥰🥰

[@realpars]

Glad you enjoy it!

[@brianshelley88]

For smaller tanks ie

[@youthclubindia7147]

Thank you

[@realpars]

You are welcome, Mohammad!

[@MrSidra2009]

Awesome thank you

[@realpars]

You are very welcome!

[@oluwatoyinkehinde5375]

Nice and easy

[@realpars]

Glad to hear that!

[@AluwaniRalineba]

Thank you for such an awesome informative video. I would like to know how effective are continuous sensors in measurements where there is a lot of turbulence?

[@realpars]

Thanks for your support, Aluwani! That makes for a great topic suggestion, I will happily forward that to our course developers. Hopefully, this is a topic we can focus on in the future. Thank you!

[@brd8764]

A sensor is a sensing device which senses information which is as a variable value for some reason for which it is required to be used in automation systems.

[@mahmoodqasim6236]

3 words. I love you.

[@realpars]

Thank you, Mahmood!

[@loudabarca8676]

thank you🤩🤩🤩🤩

[@realpars]

You’re very welcome!

[@balajim8946]

Capacitance Level sensor that you showed is continuous type

[@josepheastman8509]

Discreet step, but probably not not just high or low right?

[@braakabbany711]

No there are the two mode

[@bunnandjenn9405]

Thanks

[@realpars]

You are very welcome, Bunnath!

[@nurarif8954]

Thank U

[@realpars]

You're welcome!

[@allamasadi7970]

I can imagine a fictional character like Tony Stark watching these videos to educate himself, great video and great channel.

[@realpars]

Thanks for your support!

[@cristianocarvalho2106]

It is a good video, but I think it would be important talnk about pressure sensores for measuring liquid levels.

[@realpars]

Thanks for your comment and feedback, Cristiano!

[@alinamelz2529]

hello, thanks a lot for your explanations. can you do a video about trap steam, types, how they work and effective places to install.

[@realpars]

Hey Alina! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@pcrb2695]

Dear Realpars Team, Could you please create an video on practical math behind each type of measurement? Eg., Capacitance type works on C = (epsilon*A) / d (correct me if im wrong) like wise kindly explain all of the measurement techniques. when we map instrument self calculation against with the theoretical formula which will help us in the real world where the error is lying whether its with instrument or in the control loop etc., Suppose the way we do calculation(to find unknown temperature from a known resistance measured from multimeter eg., measured resistance at RTD as 115 ohms; Temp Coefficient = 0.00385; R0=100) for RTD like Rt= R0(1+alpha*t) ; if i simplify this equation we will get approx.t = 38.9 degC which will give us quick conclusion without seeing any standard table etc.,where actually the problem is. Kindly do the needful Best Regards, PC Raju

[@realpars]

Thanks for the topic suggestion, Raju! I will definitely go ahead and forward this to our creator team. Happy learning!

[@nirwan8705]

thanks

[@realpars]

You are very welcome!

[@JZ-Sensor]

USEFUL

[@realpars]

Glad to hear that! Happy learning

[@melquiadesdelgadoramirez680]

I would add very well explained videos. However, you didn't mention Gamma Radioactive-based Level Sensors, used for both Continuous and Point Level Measurement of liquids, solids and slurries. With no moving parts and non-invasive elements is a good alternative for level measurement in huge recipients.

[@realpars]

Yes, nuclear level gauges (gamma gauges) are very useful for tanks that store very corrosive or hazardous chemicals because these gauges do not contact the fluid. However, they are very expensive to purchase and in many countries (like the US), special training is required of the instrument technicians and special reporting is required for moving or replacing the nuclear sources. These types of level sensors are heavily used in the oil and refining industries.

[@sufiomargasanov3952]

Why have you forgotten about the pressure level sensor, one of the best, and also want to add to the capacitance sensor - huge problems due to foam , I don't recommend it at the food industry

[@UHTMK3579]

One more sensor with rotating blades which is commonly used in foundry

[@rameshpalla318]

Super sir

[@TheCommonSenseProfessor]

First off, great video as always. I am curious why you list capacitance level probes as point level measurement and small? Thank you again, your videos are always a great tool for my classes.

[@realpars]

Capacitance level sensors come in two basic configurations. The types used for point-level detection are usually compact, similar to a tuning fork type sensor. Capacitance sensors used for analog level measurement are typically much larger (longer) and installed from the top of the tank or vessel.

[@HariKumar-um4rh]

Can u make a detailed video for logo plc and its programming.....

[@realpars]

Hi Hari, Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@sadiqabubakar5339]

Thanks for this Great video!! Can I use the ultrasonic radar to check the level of my gas cylinder?

[@realpars]

A gas cylinder may or may not have a liquid phase. If it is does, it is possible, but not recommended to use ultrasonic for the level. The liquid and gas phase above the liquid are in equilibrium, and as the cylinder is used, the pressure of the gas changes, causing a change in density. This change alters the sound wave reflection time, and false readings would be given without a fairly complex pressure-compensation calculation. It can be done, but gas cylinder level is best detected by pressure or load cell (scale).

[@dennismuralles6729]

Could you please, talk about diferents between NPN and PNP inputs/outputs againts relays outputs in a PLC. thanks you

[@realpars]

Hi Dennis, thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@dennismuralles6729]

@@realpars you guys are the best 3 years later im still learning from you. thumbs up.

[@iDrunkky]

There are more ways like DP measrument method displacemnt method

[@tinashechigu9839]

What about a level probe which consists of a float moving up and down a certain bar which seem to be conductive mainly used for continuous measurement

[@4edt]

Sir I need help to choose the proper sensor to calculate water level with range 0-3mm, thanks

[@tempegoreng2345]

Hy, i really like the video And i have something to ask for What is exactly the difference between ultrasonic and radar sensors?

[@realpars]

Hi Agra, Thanks for your comment and great question! This would make for an interesting video course, I will go ahead and forward this to our course developers for possible future video courses. Thanks for sharing and happy learning!

[@circulasbutton409]

Great explanation!, although im having trouble to identify the type of sensors for my aboveground fuel tanks... do you mind recommending me which type is the best for detecting petroleum and diesels??

[@realpars]

Thank you for reaching out with your question. While we'd love to assist you in finding the right sensor for your application, it's important to consider the specific engineering requirements of your controller and electrical system, as well as any local electrical safety codes that may apply in your area. To ensure you receive the most accurate recommendation, we suggest reaching out to your engineering group or a local vendor specializing in these sensors. Additionally, here's a link to an international company that may offer products suitable for your needs, which you can review at your convenience. www.emerson.com/en-us/automation/rosemount

[@manojjp8988]

Great application of modern day science, but will the continuous level be acid resistant? What is the MOC of the these level sensors.

[@realpars]

There are many types of acids, so there is not one universal answer to your question. However, Hastelloy C is often a good choice for acid chlorides. Telfon-coated sensors are generally good for all acidic service, but not all manufacturers have Teflon-coating as an option.

[@alhassanalmusawy2056]

What about level transmitters

[@user-tt8xc7ff2t]

We have been searching oil level sensor at the bottom of methanol tank. The system contains a few parts where methanol liquid comes in contact with sealing oil. Since methanol is highly inflammable, corrosive, and toxic to human, I am having trouble what kind of oil level sensor to install to the tank. I would appreciate some advice.

[@OoiPaul]

There is also gas level sensor

[@ANILKumar-jf8tk]

Sir please explain VFD internal circuit how to firing igbt working and how set firing angle ???

[@realpars]

I am going to refer to to this link for a very direct explanation: www.vfds.com/blog/switching-it-up-igbt.

[@azuzkharef2293]

Good

[@mahmudulhossainnasim7612]

Love it

[@malxruxes6704]

Hi, i am currently researching sensors - for the purpose of checking high/low values in water tanks stationed at peoples homes. From this video a conductivity sensor seems appropriate as i wish to do as little damage as possible to the water tank, and it needs to be cost efficient. Do you have any thoughts, and are there any research material you would recommend?

[@realpars]

For this application, either a capacitance probe or a Hall effect sensor would likely be a good fit. Residential water tanks are constructed out of metal or plastic, and depending on the application, may be outfitted with varying degrees of insulated jacketing. You will need to do some “on-the-ground” testing to see which sensors work best. The good news is that these sensors are fairly inexpensive (

[@user-em3en3sx9u]

Hi just wanna ask if do you have any recommend device to identify the weight of mixed powder in the hopper with open at the bottom, thank you so much.

[@realpars]

Hi there, Thank you for your question. Unfortunately, I can’t make any recommendations, as I don’t fully know your process. However, here are two companies that might be able to help with your question, and they also have information for your review. You can also google the for-weight sensing scales. Happy learning! www.omega.com/en-us/ www.keyence.com/products/

[@P.J16]

1:15 capacitive could be a continuous level indication sensor, although exist also point level

[@simedward0903]

Ultrasonic level transmitter liquid vapor can cause an overestimate of the level in the pond?

[@realpars]

It could. Substantial liquid vapor can "muddle" the reflected signal and cause error in the measurement. This can be mostly overcome by calibrating the sensor under normal operating conditions, including the head space environmental conditions. Use of ultrasonic sensors with a normal amount of liquid vapor (well below the saturation point) should not pose a problem.

[@FLETCH9]

Super

[@shahariarhassan9270]

Capacitive level sensors are continuous level sensors, aren't they?

[@masbro-jk5bg]

great vdeo

[@realpars]

Thank you!

[@jishadus5683]

We need a level sensor like float switch that measure high level of tank . We are using resin in the tank and need a siren sound system that work at tank max. Level . Which sensor is the best and how it’s use?

[@weizhang3513]

Our company is mainly engaged in liquid level sensor products. If you are interested, please go to our company's official website to check relevant products. Web:www.level-measure.com E-mail:[e-mail] Call:15896421004

[@tanbirulquadirchoudhury4818]

Can a capacitance sensor be a (used as ) continous level sensor?

[@realpars]

Yes. There are many manufacturers and models of continuous capacitance level sensors. Just make sure you buy the correct transmitter for your application. A capacitance point level sensor typically cannot be used for continuous level without a change of electronics. You can use a continuous level transmitter as a point level sensor by defining an alarm contact at the desired level.

[@cck0728]

Excellent video. Pressure gauges can also be used as level gauges....Isn't it?

[@iDrunkky]

It is rather called gauge glass or glass indicator

[@sjholmesbrown]

Indeed, hydrostatic level sensors use the pressure of a column of liquid to determine depth and thus level. Capacitive level sensors can also be continuous, they use a long rod suspended into the medium

[@cck0728]

@@iDrunkky No it's not like this. It's a different story.

[@darbarisid]

@@sjholmesbrown thanks it helped.. I was confused about capacitive type.. was thinking it can be continuous but was shown as point type..