How to Measure Flow Rate with a DP Transmitter
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- เผยแพร่เมื่อ 14 ต.ค. 2024
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In this video, we’re going to introduce you to flow measurement using a Differential Pressure Transmitter.
Before we get started, you might want to review two of our other videos Differential Pressure Transmitter Explained (realpars.com/d..., and What is Sensor Calibration and Why is it Important? (realpars.com/s....
Flow transmitter calibration is the focus of our discussion, but let’s review some other important terms first. We’re going to define the terms Range and Span and Zero/Span adjustments.
After that we are going to:
- Explain how a Differential Pressure Transmitter is used to measure the volumetric flow rate
- Explain why a Square Root Extractor is needed in Differential Pressure Transmitter flow measurements.
Instrument calibration is a process where the instrument is adjusted in order to achieve the desired output range for a specific input range.
The input Span of an instrument is simply its Lower Range Value often referred to as LRV, subtracted from its Upper Range Value, often referred to as URV.
Zero and Span are the names of the adjustments made in order to calibrate an instrument. There are many ways to adjust zero and span.
For example, they could be physical adjustments such as potentiometers, or software-based push-button adjustments.
A common method of flow measurement is done by using a Differential Pressure Transmitter.
The Differential Pressure Transmitter often referred to as a Delta P transmitter, is placed across an obstruction such as an orifice plate.
The orifice plate will cause a varying differential pressure drop across it as the flow through the pipe changes.
Unfortunately, the Differential Pressure across the orifice is not proportional to the flow rate but is actually proportional to the square of the flow rate. That’s why in applications like this, we need a Square Root Extractor.
Sometimes this square root function is built into the transmitter and sometimes a Square Root Extractor is a separate signal conditioning instrument connected to the output of the transmitter.
In fact, the volumetric flow rate is directly proportional to the square root of the differential pressure.
There is a way for the flow rate to be directly proportional to the differential pressure, and that’s by removing the square root from the equation.
A Square Root Extractor will perform this function.
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As a person related to process automation, I really like this channel, keep up the good work.
I’ve been learning more from this videos than from work of how it works 😅
That is a great compliment!
best channel for me...
We are waiting for part 2 of this video as soon as possible..!!!!!
To all the people who viewed. Keep up the good work
Thank you!
Huge thanks RealPars,
A long time ago, I have been waiting for this informative video... 😍😘
Great to hear that! Thanks for sharing, and great to see you here again!
Excellent content and resolution with less disk space, keep improving RealPars. I closely follow up these interesting videos, but so far I haven't found the video "How to check the accuracy of a DP flow transmitter". Did you already submitted it? Thank you.
Hi Melquiades,
Thanks for your comment and sharing your support with us. Regarding the topic suggestion, I will make sure to forward this to our course developers and see if this is in the pipeline for the near future.
Thanks for sharing and happy learning!
Thank you for the video and i want to see folw rate with harde communication
we wait for such as this videos keep going
Thank you, Keyan!
Very Great explanation. I love the channel
Thanks for your support, Sultan! We love receiving such positive feedback!
Neat and clear explanation!
Glad you liked it!
nice and so informative video
Thanks a lot!
Wow man nice video evertime!!!!
Thank you! Happy learning!
Nice explanation n information sir...
You are very welcome!
Great video!!!
Nice lecture sir
Thank you!
thanks realpars...
Excellent channel tnx
Thanks a lot!
Thank you, video very helpful.
Great to hear that! Thanks for sharing.
This video is awesome thanks
Great to hear that, Hassan!
Very interesting topics
Great to hear that, Juan! Thanks for sharing and happy learning.
Thanks for sharing; I'm looking for PLC or node-red software blocks to perform calculations according to the IAPWS-IF97 standard. Can you help me?
Hi Mario,
Thanks for your comment!
We sell a variety of software and hardware over at our online store. shop.realpars.com/
Feel free to browse around, if you have any other questions you can always reach out to us over at hello@realpars.com
Thanks!
You're welcome!
Thank you...can you demonstrate pressure and temperature correction on dp flow measurement?
Hi Abdulhaq!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Nice
Thank you!
Nice share
Why is it so expensive to measure the flow-rate ? Alot of small Sensors costs up to 1000 Euros. Of course it depends on how precisely you want the result to be. But is there a cheaper / easy way to Measure the flow rate ?
If your meter comes in an explosion-proof stainless steel enclosure, that adds quite a bit to the price. But you are correct, they really are overpriced (especially the simple DP meter).
As for building your own, you can get the PCB mounted DP sensors for cheap. You would have to do your own software, but there are probably examples out there.
The question is a little bit vague. It depends on what kind of fluid you want to measure. If for example you want to measure the water flow rate, then there are many options available in the market with less than 1000 euro.
What does the ‘oc’ in between q and square root of delta p at 4:00 ??
Hi @Smokin' Joe. It looks like "oc" but it's the symbol for "proportional to". The equation in words is "Q is proportional to the square root of delta P.
Hi this question is not related to flow but this question is about pressure transmitter range.if pressure transmitter have range -100 to 150 kpa then what will be MA at -92.plz any body reply me and plz share the formula thanks
Hi Mohammed. Thanks for reaching out. Total span is -100 kpa plus 150 kpa = 250 kpa. -100 kpa is 4 mA. 150 kpA is 20 ma. 50% point is 25 kpa and is 12 ma. -92 kpa is 3.2% of span. 3.2% of 20 ma = 0.64 ma. Therefore at -92 kpa, the current would be 4 ma plus 0.64 ma = 4.64 ma
@@realpars thanks but I also wants farmula for this type of conditions or do a video I will be better.
Please I need step 7 software 5.3v for Siemens PLC families any description
Hi Adewale,
Thanks for your comment!
We sell a variety of software and hardware in our online store, including STEP7. bit.ly/2WjJDCR
Feel free to check it out, if you have any questions please let us know.
Happy learning!
@@realpars thanks so much I followed the linked. Thanks so much
Cool
Make a wireless sensor please, and how to connect it with plc
Hey Ikhsan!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
All your videos subtitle blocks visibility of the animation.please remove black background of your subtitles & make letters in black.problem will be solved
Hi Samir, thank you for your feedback, and we're sorry to hear that! I will go ahead and forward this to our content team.
Nice