Pressure Sensor, Transducer, and Transmitter Explained | Application of Each
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- เผยแพร่เมื่อ 19 พ.ค. 2024
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⌚Timestamps:
00:00 - Intro
01:00 - 1) What is a sensor?
01:18 - 2) What is a transducer?
01:57 - Sensors vs transducers
02:17 - 3) What is a transmitter?
03:12 - Pressure sensors vs transducers
04:22 - 4) What is a Pressure Switch?
04:31 - Pressure switch vs pressure transmitter
05:23 - Pressure switch vs pressure transmitter in practice
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Over the years, the terms sensor, transducer, and transmitter have become confusing because they are often used interchangeably and indiscriminately by different vendors.
The terms sensor and transducer have been around for a very long time, but in the world of process control, the term transmitter is not very old.
In particular, the term transducer is tossed around as a name for many devices and instruments.
Just to confuse the issue, sensor and transducer have often been used as synonyms.
1) A sensor is a device or element that performs the initial measurement as it senses the changes in a physical variable.
A sensor is a device that makes physical contact with the variable being measured and detects changes and provides a corresponding output signal that can be measured.
2) A transducer is a device that converts one form of energy to another. A Transducer provides an output quantity having a specified relation to an input quantity.
A strain gauge is a transducer whose resistance value changes proportionally to the strain it experiences.
All sensors are transducers, but not all transducers are sensors.
Consider a loudspeaker that converts an electrical signal into motion. The loudspeaker is a transducer, but not a sensor.
3) The term transmitter has more than one definition.
- The process control term was likely borrowed from the Telecommunications world where a Transmitter is a device that produces and transmits radio waves radiating from an antenna. These radio waves are eventually detected and demodulated by a Radio Receiver.
- In the world of process control, a Transmitter is a device that transmits a standard instrumentation signal representing a physical variable being measured.
The standard electrical signals are 1-5 V or 4-20 mA which represents 0-100% of the physical variables being measured. This transmitted signal is detected by a Receiver such as an Analog Input on a PLC or a DCS.
A sensor performs the initial measurement. If necessary, a transducer converts this initial measurement into an electrical signal that is then amplified and standardized by the transmitter.
Here's an example… We are measuring a process pressure with a range of 0-100 psi. Our Sensor/transducer performs the initial measurement and converts it to an electrical signal of 0-3 mV. The transmitter then converts that signal to a standard signal of 0-5 V, which is received by a PLC analog input module.
4) A Pressure Switch is a two-part device consisting of a sensing transducer and an electrical switch.
A pressure switch has a transducer just like a pressure transmitter. That’s where the similarity ends.
A Pressure Transmitter produces an analog electrical voltage or a current signal representing 0-100% of physical process pressure. A pressure switch has electrical contacts that open and close at a specific pressure.
Let’s illustrate with an example… We have a process control system where we need to open a valve when the pressure in a pipe reaches 50 psi.
- We can use a pressure transmitter calibrated to produce a 4-20 mA output for a pressure range of 0-100 psi.
We need an analog input module on our PLC, and we need to scale the analog module and insert code into the PLC program so that the 50 psi value triggers an event to open the valve.
- It’s much easier to use a pressure switch connected to a simple PLC digital input module. The PLC valve control logic is much simpler as well.
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#RealPars #Sensor #Transducer
The loud speaker example was really helpful because I was a little confused as another video I saw said that 'sensor converts physical input quantity into an electronic output'.
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Glad to hear that our video course has been so helpful! You're very welcome!
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Great choice to use an example with pipe pressure. Showing how the logic on the computer was simplified by selecting a switch was excellent.
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I really apreciated, now i can differentiate each other. Thank's
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Thanks for your comment and great topic suggestion!
I will go ahead and pass this on to our course developers for future video courses.
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Hi
What's the difference between transmitter & transducer?
Thanks
Hi there. There's certainly lots of confusion in the industry as the terms are often used to describe the same thing. A transducer is also referred to as a sensor. A sensor is a device that detects whatever variable is being measured, monitored and/or controlled. The sensor is connected to a transmitter. The transmitter produces a signal that represents the process being measured. This signal is sent to a receiving device such as a PLC.
Thanks, very useful
You're welcome!
For marine engine, we often find the term Sender, for temperature and pressure measurement.
Very informative..
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Thanks ♥️
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Good information
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What an amazing and impressive videos! Thanks for sharing all the knowledge. By the way, may I know what software you used to create all these educational animated videos? Thanks
Thanks for your positive feedback! We are very happy to hear that. Regarding your question, I am actually not sure about that as this is done by our graphic and animation department.
Thanks a lot
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Thank you so much!
Any thoughts on a motor protection relay video?
Hi Matthew,
I will pass your topic suggestion on to our course developers!
Happy learning
Thanks
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Only legend knows this video already upload.. 🔥🔥🔥. Still interested to rewatch and refresh knowledge
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Same sensors have a rs485 or profinet output conection.
Tnx
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its easy to understand by output signal.
Sensor output should be Electrical.
and Transducer have any type of variable in input side or output side.
Can you please tell me the software/tool you used to design your figure (figure at 6:10)?
Hi Mutiu!
Thanks for your comment! I am actually not sure about that as all our designs are created by our Graphic and Animation department.
Sir I want to clear a point...
In video it is said tha "All sensors are transducers but not all transducers are sensors".
What about RTD which is sensors that it changes its resistance when temperature changes but doesnot convert a form of energy to other.
So I think its a sensors but not a transducer.
Hi Khuram. The terms do get a bit muddied. An RTD is a transducer. consider that it as it converts temperature to resistance. As for transducers, we could probably categorize them as input or output, which perhaps provides clarity between sensor/transducer. In the video, we used a loudspeaker that would be considered an output transducer.
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Nice
thanks '
You're very welcome!
So this sensor can make physical contact to the system without damage ?
Hi @brad. The short answer is yes. When you buy a sensor such as a pressure sensor, it's best to check to see if it is suitable for the physical material under test. On the other hand, RTD sensors cannot usually be exposed to the process directly and consequently are inserted into a thermowell.
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Great
Sir what is AI AO DI DO
AI: Analog Input
AO: Analog Output
DI: Digital Output
DO: Digital Output
think of 'analog' as a range of values, such as a pressure readout, or temperature. while 'digital' will always be either on or off, like a cutoff, or light
I was really Confused But now it's Ckear
Glad to hear that, Raja!
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let me see if I get it straight: A pressure transmitter is a pressure transducer or sensor which has an antenna
No, it doesn't always have an antenna. It has some means of transmitting the signal measurement over distance. That could be a wired connection.
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Isn’t it “All transducers are sensors but all sensors are not transducers”?
Heard it a hundred times to make sure.
Hi @Jannath Shiyana. Thanks for reaching out! We love to hear from viewers. In our video, we state that “All sensors are transducers, but not all transducers are sensors”. What are you referring to when you say “Heard it a hundred times to make sure”?
The term traducer is garbage. Just say "electrical sensor"
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Thank you very much, Nizar!
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