Pressure Gauge Explained | Types of Gauges
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- Опубліковано 6 лип 2024
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⌚Timestamps:
00:00 - Intro
00:32 - What is a pressure gauge?
00:56 - Types of pressure gauges
01:16 - Mechanical pressure gauges
02:03 - C type bourdon tube
03:15 - Zero and multiplication error
04:46 - Calibration procedure
05:25 - Gauge accuracy
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In this video, we’re going to talk about a very common instrument found in the industry today, the Pressure Gauge.
It would be difficult to walk through any industrial or food processing plant or manufacturing facility without seeing a pressure gauge of some type.
A pressure gauge is an instrument for measuring fluid intensity in a pressure-powered machine. This fluid intensity is specified by the force that the fluid would exert on a specific unit area.
Typical pressure gauge intensity measurement units are pounds per square inch (psi), or newtons per square meter called the Pascal.
Categorizing Pressure gauges has become more challenging with the introduction of electronic transducers and devices.
Historically, pressure gauges were mechanical devices with analog scales. Today we have pressure gauges with pressure-sensing transducers operating electronic digital readouts.
There are many types of mechanical pressure gauges. Three of the most common types are
1) Diaphragm,
2) Bellows,
3) Bourdon Tube.
1) A diaphragm pressure gauge uses the deflection of a flexible thin membrane called the diaphragm to measure the pressure of the fluid in a system.
2) A bellows is a corrugated expandable device made up of corrugations or ribs called convolutions. The bellows are usually brass or stainless steel and very sensitive. Pressure is supplied to the bellows causing it to expand which in turn, moves a pointer.
3) Of those three mechanical pressure gauges, by far the most common is the Bourdon Tube type. The most common type of Bourdon tube gauge is the C type in which the tube is shaped to resemble the letter C. The tube is opened at one end and sealed at the other.
A change in pressure causes a deflection in the tube that is proportional to the applied pressure.
The actual movement of the tube is converted into a pressure indication on a calibrated faceplate. The maximum movement of the pointer is usually 270 degrees.
A typical bourdon tube pressure gauge has a rack and pinion driven by an adjustable link and lever. As the tube straightens due to a pressure increase, the sealed tip will move.
A link attached to the tip of the C tube transfers the motion to a sector gear. The sector gear meshes with a pinion that turns a shaft that is connected to a pointer. The motion of the shaft causes the pointer to move on the calibrated graduated scale.
As with most instruments, routine adjustments are required on Bourdon Tube pressure gauges.
The two errors that require adjustments are Zero Error and Multiplication Error.
- Zero error is the error of the same amount and in the same direction throughout the entire pressure range regardless of the input pressure.
- Multiplication Error is the error when the total movement of the mechanism does not equal the total change in input.
Calibration is normally done on a workbench using a pressure sourcing device such as a deadweight tester.
Zero error is corrected by repositioning the pointer on the shaft or by changing the tension in the spring. Multiplication error is corrected by changing the length of the levers.
A mechanical pressure gauge will have an analog readout or analog scale.
Many of today’s pressure gauges are equipped with a digital display.
The American Society of Mechanical Engineers ASME B40.1 Standard defines the accuracy grades of dial-type gauges. Requirements differ from one industry to another and the ASME B40.1 would be your guide for proper selection.
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Man... Realpars video quality is beyond perfection. Love you guys, keep it up!
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What a crystal clear Explanation!, Very well done guys you are one of the best technical trainers I have ever seen...
Same for me here
Thank you very much!
Great videos! I use them constantly to train my operators at the wastewater treatment plant i work at. I'm the head of training and do in-house training videos myself so I really appreciate your guys content. Keep up the great work!
Hi @Chris Goward. I'm please you like the video. In my experience, it was always the new apprentices who calibrated the gauges. Kind of like a welcome to the industry exercise.
Great explanation. Keep up the good work 👍
Thank you very much!
Great explanation with detailed examples as usual.
Thank you for the video.
keep it up !!
You are very welcome! We appreciate your support
great video thanks real pars
Fantastic! A concise class! Very much appreciated.
Thank you very much!
I have a lot by seeing videos at realpars and compare this at my plant instruments.
Thank you for making this types of video to train a untrained man
Glad it was helpful!
many thanks for the video - greetings from Italy
Our pleasure!
Informative video
Glad you think so!
I love this! Have you done a video series on different valve types? E.g. butterfly, gate, ball, plug, etc.
Great suggestion! Thank you, Daniel. I will happily pass this on to our course developers.
Yes valves Type, suitable application, etc
yes, please.
Great, i learn more from this, many thanks
Glad to hear that! Happy learning
Awesome 🔥🔥🔥
Hello real pars
The summary at the end of the video is also much appreciated!
Thanks for your feedback, Daniel! Much appreciated.
Love your videos!
Glad you like them!
Realpars always on the top👌...can you guys do a video for dp flow meter with pressure and temperature compensation?
Great suggestion! Will definitely share this with the course developers.
Thank you.👏
Our pleasure, Abulfaz!
Great video
Glad you enjoyed it!
Nice
I work in refinery thank you for information
Most welcome!
Is pressure gauge for fluid, for example oil, and compressed air different? Can the same type of gauge used for fluid and for compresed air?
Hi @modeltocnc. The gauge is esentially the same for any type of fluid. Although, some gauges are oil-filled for a number of reasons such as mesasring pressure of corrosive liquids, or in a high vibration environment.
@@realpars thank you.
What is the difference between 3A & 2A then? It is showing same.
Hello @Kishor Roy. Thanks for your question. There are 3 categories of gauges as specified by ASME. They are Laboratory, Test, and Process. 3A is for Test Gauges, 2A is for Process Gauges. We did not show the categories in our video. Our intent was to show viewers that there was such a table and use the specs for our accuracy example.
👍👍👍
For a 50 psi pressure Gauge, the accuracy is 1% of the span ie 0.5 psi.
How it will be 49 & 51,
It supposed to be 49.5 and 50.5 psi
Am I right?
Hi @Jose Thomas. You had me checking my math. But, the answer in the video is correct. The accuracy is 1% of the full-scale value (span) which is 100 psi.
Thank you Sir,
it was my mistake. I didn't observe the full range of the gauge.
Anyway great vedeo, and I am expecting more from you.
We are still using inchwater, anyone else use inchwater to measure pressure?
Hi @Jerry Arns. Inches WC is still a very popular pressure measurement particularly in small pressure applications.
Nice