Information on Pressure Sensors for Pressure Vessels?

Status
Not open for further replies.
A

aalba005

Member
I apologize if this is an inappropriate question for such a forum but i figure it would not hurt to try. I am a Mechanical Engineering student working on my senior design project and have hit a road block with sensor selection. Any help would be of great use!

I have been sifting though hundreds of manufacturing catalogs looking for what might fit into what i need but to no avail as of yet.

I'm working on designing a pressure vessel, cylinder with flat top and bottom bolt sealed from the top, and i need to measure the pressure within the vessel. The vessel is about 5 inches in diameter and 8 inches in height. So the sensor should be small. How to i approach this? Anyone can advise me on good reading material for such sensors?

Standards range of operations would be 0-2000 psi and 0-200 degrees C.

I really appreciate any information or a helping hand pointing to the right direction.

Best regards.
aal
 
Thanks for the link! I actually sifted through there website and read the various literature available and had my eye on

http://www.omega.com/ppt/pptsc.asp?ref=OM-CP-PRTC210

So i would make a threaded hole on top of the pressure vessel specific to a standard fitting of the device and connect the device to the fitting? Is there something i am missing?

Any additional pointers or information would be of great help! I need to be able to back up my sensor choice to my university before they will fund the purchase.

I will continue reading through the user manuals on the link you provided.

Best regards,
aal
 
aalba005 said:
So i would make a threaded hole on top of the pressure vessel specific to a standard fitting of the device and connect the device to the fitting? Is there something i am missing?...l
Click to expand...
Yes, the pressure vessel would be tapped to fit the threads of the pressure transducer. Is this going to control some other device or is just going to display the internal pressure and temperature? In either case you have to connect the output(s) of the sensor(s) to a display device or a control device.
 
Thanks!

Yea the purpose is just to read out the internal pressure and temperature within the pressure vessel and save the data to later be exported to either a special software package or excel if need be.

Can't be wired because the vessel is going to be rotating in a planetary ball mill so i need to mount the sensor, turn on the mill, then after it is done get the temperature and pressure readings that occured during milling.

thanks for the links and advice don_rescapt19, will spend a lot of time this week doing some research.

Appreciate your response.

Best regards,
aal
 
090426-1918 EST

aalba005:

I put in some specifications at Omega and came up with this transducer.

http://www.omega.com/ppt/pptsc.asp?ref=PX35K1

This does not meet your temperature specifications, but gives a list of specs to look at.

Depending upon how the pressure is produced in your vessel you should pick a transducer with a full scale rating of maybe 2 to 4 times the pressure you expect to measure. Maybe 10 times.

Here is an illustration of a problem. An ordinary hydraulic pump with a capability of say 2500 PSI and a regulator set at 500 PSI may may actually produce 2500 PSI during a transient period because the regulator can not respond rapidly enough to the transient condition. For example when a valve closes.

Another example: if I have a hydraulic press that inserts the pinion bearing cup into a differential carrier and the pressure regulator is set to 500 PSI, then when the cup bottoms there is an instantaneous rise in pressure to many times that set by the regulator. Whether you are measuring pressure or the force directly the transducer must be able, on a repetitive basis, to tolerate this peak value.

In a slightly different application, but still on a differential assembly operation, this being pinion preload adjustment, we have a 30 # force transducer that can tolerate 10,000 # overload. These transducers were designed about 40 years ago and have had very good life in a tough environment.

Straingage transducers typically have good life at 1000 microstrain, 1500 a short life, and above this a zero offset and or fatigue failure. The base material, like 7075 or 6061, may have mechanical characteristics much better than the gage material.

You want a transducer with remote electronics because of your temperature range.

Even with a transducer that can tolerate the temperature range the temperature is still going to be a big problem if you need high accuracy. You may need to perform calibration measurements at different temperatures and correct your output results.

You will need to talk to your vendor on how to achieve your temperature range.

If transient capability for a fractional part of a second is adequate, then a quartz transducer might be your best choice. For DC capability go with a non-semiconductor straingage transducer.

If you were doing something like testing input manifolds where you ignite an explosive mixture, then a transient transducer would be adequate. My son makes test fixtures for one of his customers to do this type of testing.

.
 
aalba005 said:
I apologize if this is an inappropriate question for such a forum but i figure it would not hurt to try. I am a Mechanical Engineering student working on my senior design project and have hit a road block with sensor selection. Any help would be of great use!

I have been sifting though hundreds of manufacturing catalogs looking for what might fit into what i need but to no avail as of yet.

I'm working on designing a pressure vessel, cylinder with flat top and bottom bolt sealed from the top, and i need to measure the pressure within the vessel. The vessel is about 5 inches in diameter and 8 inches in height. So the sensor should be small. How to i approach this? Anyone can advise me on good reading material for such sensors?

Standards range of operations would be 0-2000 psi and 0-200 degrees C.

I really appreciate any information or a helping hand pointing to the right direction.

Best regards.
aal
Click to expand...

http://www.dynisco.com/products.aspx?FID=76&MID=1433&lang=en

If you would like to have the data while the equipmnnt is being used, you can opt for a wireless transmitter.

http://hpsweb.honeywell.com/Culture...ess/xyr6000wireless/xyr6000analog/default.htm

or

http://www.irtelemetrics.com/products/index.html
 
aalba005 said:
...
Can't be wired because the vessel is going to be rotating in a planetary ball mill so i need to mount the sensor, turn on the mill, then after it is done get the temperature and pressure readings that occured during milling. ...
Click to expand...
That does make it more difficult. How are you going to protect the device? Is the device rated for the G-forces that will be imposed on it when it is in the mill?
 
Thanks for the examples gar! Gives me more to think about now :)


weressl said:
http://www.dynisco.com/products.aspx?FID=76&MID=1433&lang=en

If you would like to have the data while the equipment is being used, you can opt for a wireless transmitter.

http://hpsweb.honeywell.com/Culture...ess/xyr6000wireless/xyr6000analog/default.htm

or

http://www.irtelemetrics.com/products/index.html
Click to expand...

Interesting sensor! It also can be ordered with a built in thermocouple. I have to see if the dimensions are going to work.

Thanks weressl!

don_resqcapt19 said:
That does make it more difficult. How are you going to protect the device? Is the device rated for the G-forces that will be imposed on it when it is in the mill?
Click to expand...

I am not sure how to protect the device.

I am not sure at what RPM our experiments would run on but its estimated at 100-400 rpm. I would have figured that these devices would be-able to stand such g-forces without modification, am i incorrect with this assumption? Do i need to look at different sensors that can withstand g-force or is there a way to protect standard devices for G-forces?

Interesting parameter i did not think it would be an issue... i guess more research is needed for now.

Thanks as always!
 
aalba005 said:
Thanks for the examples gar! Gives me more to think about now :)




Interesting sensor! It also can be ordered with a built in thermocouple. I have to see if the dimensions are going to work.

Thanks weressl!



I am not sure how to protect the device.

I am not sure at what RPM our experiments would run on but its estimated at 100-400 rpm. I would have figured that these devices would be-able to stand such g-forces without modification, am i incorrect with this assumption? Do i need to look at different sensors that can withstand g-force or is there a way to protect standard devices for G-forces?

Interesting parameter i did not think it would be an issue... i guess more research is needed for now.

Thanks as always!
Click to expand...

You're welcome.

You need to check ALL operating parameters of a device against the application. After a while in practice you wull know what to ignore and what is practical and how many decimal points are important. Until then you better pay attention to all.....:smile:
 
Status
Not open for further replies.
Top