Pressure Transmitter Explained | Working Principle

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In this video, we’re going to introduce you to a very versatile instrument used in industry today - the Pressure Transmitter.
First of all, let’s discuss the terms Transducer and Transmitter. Some people will tell you that a Transducer and a Transmitter are the same things and therefore the terms are interchangeable.
If you are curious, conduct a web search of the two terms and you will be surprised at the wide range of results!
A transducer is a device that converts one form of energy to another.
For example, an electrical transducer converts a sensed physical variable like temperature into an analog electrical signal.
A transmitter is a device that converts the electrical signal from the transducer into a much larger electrical signal that can be sent over a long distance to a PLC or a DCS.
The transmitter output signal is usually a range of voltage (1 to 5 V) or current (4 to 20 mA) which represents the 0 to 100% of the sensed physical variable.
A Pressure Transmitter is an instrument connected to a Pressure Transducer.
The output of a Pressure Transmitter is an analog electrical voltage or a current signal representing 0 to 100% of the pressure range sensed by the transducer.
Pressure transmitters can measure absolute, gauge, or differential pressures.
Absolute pressure is referenced to a perfect vacuum which is considered 0 psi! We express vacuum pressure as 0 psi (a).
Atmospheric pressure is usually about 14.7 psi (a).
The most common pressure measurement is gauge pressure which is the total pressure minus the atmospheric pressure.
Atmospheric pressure is 0 psi (g).
Let’s have a look at an example of a Pressure Transmitter measuring process pressure of gasses in a pipeline.
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You might want to review 2 of our other videos:
1) What is a Pressure Sensor? realpars.com/pressure-sensor/
2) Differential Pressure Transmitter Explained realpars.com/differential-pre...
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[@industrialsathi6629]

There is no exact word to praise describe the simplicity and usefulness of your video❤️❤️. Love n gratitude..

[@realpars]

Thank you so much!

[@Hamza_Algmaty_1996]

Please keep making these great videos

[@DeadTalkLive]

Very interesting clip 👍👍! As a current KZbinr, I am always looking for new ideas! Great Job!

[@chempraveen4u]

very well explained...

[@lugongguo8125]

Thanks for the excellent video. I work in building operation field and use Siemens BMS. I watch video everyday on this channel want to learn more or improve my career to another level. Thanks again!

[@realpars]

That's amazing to hear, Lugong! Thanks a million for sharing that.

[@calvinceogara2088]

Well put. Much thanks!!

[@realpars]

You're very welcome, Calvince!

[@SrOsvaldo1]

Thank you Real Pars. The output of the transmiter may be 0 -10V or 0 - 20mA too, those are old formats, but in certain countrys like mine, Argentina, you can found it working even today.

[@yazzener179]

what u mean is 4-20 mA and its still used even for advanced plants.

[@SrOsvaldo1]

@@yazzener179 no @Yaz Zener, i mean 0-20mA. 4-20 is used now. 0-20 was deprecated because not distinguish between 0mA as a value measured, or a cutted line. May be i'm old :)

[@Ryarios]

0-20 mADC inputs on plc cards are pretty standard these days so that they can accept both types of signal inputs. 0-20 mADC isn’t rare enough to stop making equipment that can sense it.

[@ahmedelliftawii6323]

Keep going 👏💜

[@adityasadhukhan618]

Crystal clear explanation❤️.

[@realpars]

Great to hear that!

[@amanthakur8888]

such a good video that help me to understand in very effective way as i have to work as a Mechanical engineer in LNG Plant.

[@realpars]

Glad to hear that our video course was helpful, Aman!

[@bitebonumbere1426]

Many thanks RealPars

[@realpars]

Thank you!

[@danangbagas4207]

Thanks 🙏🙏

[@tonycuttilan3756]

Thank you

[@user-nv1lb9fy4k]

very usefully...

[@ahmedbatesh693]

awesome explanation, keep it up :)

[@realpars]

Great to hear that, Ahmed! Thank you!

[@dominioninside2233]

Outstanding!

[@realpars]

Glad you like it!

[@khushbakhtbhatti3888]

very well explained

[@realpars]

Thank you!

[@allinoneknowledge2970]

Thanks

[@sujandas-wn6cc]

Very important issue, Thanks a lot

[@realpars]

You're very welcome!

[@jorgeorozco5634]

love this channel

[@realpars]

Thank you, Jorge!

[@Amandeep-kk5fw]

Well explained

[@realpars]

Thank you!

[@MM-vi9kh]

How to save PT (hart) configuration in HART communicator 475, to be downloaded in new transmitter?

[@englishstudymasumahmed7565]

Amazing video

[@realpars]

Thank you!

[@kwandindawa]

Thanks 🎉🎉

[@realpars]

You're very welcome!

[@darkdefender6384]

Thank you so much!

[@amrfathi3155]

Great channel

[@realpars]

Thank you, Amr!

[@user-tn3bw1wg8w]

Nice video, thanks)

[@realpars]

Thank you!

[@user-tn3bw1wg8w]

@@realpars not at all) Thank you for your work on KZbin) Sorry for my English)

[@mdnezamuddin6219]

Tnx

[@jaykesapalaran5434]

Very much informative

[@realpars]

Glad it was helpful!

[@jaykesapalaran5434]

@@realpars VERY HELPFUL💌

[@TheCommonSenseProfessor]

Is 1-5 Volts more of an international standard? That is more common on component level, but in the states it is more common for transmitters to output 0-10V or 4-20 mA.

[@Ryarios]

Voltage signals are more common for transducer outputs and device inputs like plc analog inputs. On input devices, it’s often used so the card can accept both current or voltage inputs on the same point. For instance, an analog input card may have a built in 250 ohm resister. The input works on 1-5 VDC, but is made to accept either a 1-5 VDC input signal or a 4-20 mADC signal depending on if you wire to the terminals the put the resister in series with the loop or on the terminals that bypass the resister. There are transmitters that still use 1-5 VDC outputs. In industry, voltage signals have generally fallen out of favor because of their susceptibility to electrical noise. Short distance runs for voltage signals are fine - like between a thermocouple and the transmitter or inside a plc card. It becomes more problematic for long distances like between the transmitter and the plc input card. At least in the US - in higher end industry. I don’t see a lot of 0-10 VDC signals per se - except as part of a universal input. Those same inputs will usually accept a 0-20 mADC signal. 0-20mADC inputs are becoming more popular because they will accept both a 0-20 and a 4-20 mADC input signal. Some of the less expensive options may use voltage signals as outputs. It may be more common in fields like HVAC too.

[@manishagarwal3315]

Thanks sir love from india

[@realpars]

You're very welcome, Manish! Happy learning!

[@farzadfani4688]

Hi realpars. Thank you for your great training video. Please make video about"industrial automation cyber security". Thank you❤

[@realpars]

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

[@habebsabri4288]

Thanks for the great and useful videos. Can you explain to us about the industrial control algorithms? thank you

[@realpars]

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

[@habebsabri4288]

@@realpars Thanks

[@specializedenergysystems7061]

What is the connection wiring diagram for connecting 3 wire transducer to a 22 kw grundfos cue vfd

[@sg-dm4ji]

Hello sir I am from India please make lecture on volumetric flow rate and mass flow rate..please sir explain in detail.

[@realpars]

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

[@luvinit801]

What happened to the RealPars app, I can’t find It on the App Store

[@realpars]

Hi Molonai,  We have recently optimized our learning platform which includes some highly requested features. We are happy to bring you these new improvements which will grant an even better learning experience, as a result we had to decide to no longer support the RealPars App. You can use our webpage to continue watching the video courses.  Happy learning!

[@zafirstardelev2379]

Hi . What is the difference between Gauge and Differential pressure?

[@realpars]

A differential pressure transmitter has a High and a Low process connection. The difference in pressure between the two process "taps" is measured by the transmitter. The reading for a differential pressure transmitter is in bar, psi, etc. For a gauge pressure transmitter, the low side is left disconnected, but open to atmospheric pressure. Thus, it is technically still measuring a differential pressure, but always against atmospheric pressure, and the resulting pressure reading is in barg, psig, etc.

[@andystuart4667]

How do you supply power to the transducer and transmitter?

[@Ryarios]

It depends on the device and what it’s wired to. Usually a pressure transmitter is loop powered - aka a 2-wire device - which means the power source is placed in series with the transmitter output. This power source can be a separate power supply or can be internal to the monitoring device the transmitter is wired to. It’s generally your choice really. A few pressure transmitters require separate power to run the transmitter and then the transmitter powers its own output. These are known as 3-wire or 4-wire devices. You won’t know for certain how to wire something until you have complete model numbers for all the devices to be wired in the loop.

[@andystuart4667]

@@Ryarios Very helpful

[@rendichia5745]

Does TIA Portal compatible with Windows 10?

[@realpars]

Hi Ridha, Thanks for your comment. Yes, the TIA Portal software is compatible with Windows 10.

[@vikasrai5043]

Sir please make videos on Ace

[@realpars]

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

[@rosewell1983]

This looks like fun. But, where can i get a cheap PLS that i can play and have fun with?

[@ddee2501]

Ebay

[@davebennett5069]

allen bradley micro 820. cheapest one out there with the most functionality.

[@mindpeace5243]

What is Accumulator Transducers??

[@realpars]

Thanks for your comment! I will happily go ahead and pass this on to our course developers, possibly we could create a video course on this topic for you. Thank you again, and happy learning!

[@billigerfusel]

Too bad the tia license is only valid until the end of the year. Totally would have bought it then and a new plc.

[@realpars]

Thanks for your comment! That's understandable, but compared to the normal price of €2300 and having access to software for 6 months, it is still a very nice deal. ;)