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No project with pressure sensors, self study

Hello from Beavercreek, OH

Hello fron Oviedo, Spain

Iron

See you in person tomarrow

Iron

MEMS for temp and pressure

Iron

I use a MEMS sensor

Iron

Running class from archive

 

Iron

That's going to do it for today.

See you tomorrow.

Blogger

We are used to seeing Burst pressure ratings, but can you provide more detail on Proof Pressure?  Does this term only apply when additional pneumatics are involved in the sensor?

It applies to any aspect of the system. The following link provides more detail:

http://www.sensata.com/download/ipt_tech-note_2.pdf

Blogger

Thanks, Randy, Lauren, Digi-Key, and Design News.

Thanks Randy and Lauren.

Iron

slide 13, proof pressure. since proof pressure includes the pipes, tubes, or hoses; does an equivalent measurement or specification for shrinkage exist to address vacuum application?

I'm not that familiar of the spec being listed for normal vacuum measurements. When very low negative pressures measurements are involved, it should be a factor and as a result on the data sheet.

Blogger

Thanks Randy, Lauren, DesignNews & Digikey !

Iron

I think the frequency response is more a function of the packaging than anything esle, typically.  Though I have seen the self resonant frequency listed for some high pressure high end sensors.  And those would be in the kHz range.

Iron

Do most pressure sensors specify the frequency response range, or is this attribute only provided on certain class of pressure sensors? This is a value that may or not make it to the data sheet. Some suppliers can provide a value if you ask. For applications where a minimum value is required this could lead to competitors specifying the value on the data sheet. 

Blogger

Thank you again, Randy. Have a great day. Will hear you again tomorrow.

Iron

thanks Randy, Lauren, digikey and ieee....

I suppose not all mentioned sensors have the same MTBF ?
 Any particularly more robust than others ?

This is more of a function of the application and the inherent packaging design. For sensors designed for harsher environments, the manufacturer may specify a MTBF.

Blogger

Norm, most that I have seen die at about 25 psi max.  Maybe as low as 10.

Iron

There are no reference notes, just links for additonal/source material in the notes portion of PPT.

Blogger

after exposure to 2000 psi, most species' blood pressure would likely be zero...

at least on this planet

Iron

@Randy :  I suppose not all mentioned sensors have the same MTBF ?
 Any particularly more robust than others ?

Iron

It would be wonderful to have a sensor that can measure the blood pressure waveform (0 0 300 mmHg) and survive up to 2000 psi without losing calibration or damage.

Wow! I know of a few companies addressing blood pressure waveform measurements but none that also require surviving 2000 psi. Tough application.

Blogger

@dhajicek : where are the reference notes

in your .ppt viewer, go "View" -> notes
it's a "Bottom of page"-type of view

Iron

Which unit of pressure is used for what type of pressure sensors and why ?

The pressure units are in most cases determined by the application and not the sensing technology. Different techniques can be and are used for liquid depth but the measurment in either inches or feet (meters) of water. For tire pressure: PSI in North America.

Blogger

@Randy

Do most pressure sensors specify the frequency response range, or is this attribute only provided on certain class of pressure sensors?

Iron

We are used to seeing Burst pressure ratings, but can you provide more detail on Proof Pressure?  Does this term only apply when additional pneumatics are involved in the sensor?

Iron

Question for Randy: REF slide 13, proof pressure. since proof pressure includes the pipes, tubes, or hoses; does an equivalent measurement or specification for shrinkage exist to address vacuum application?

Iron

Thank you Randy and Lauren for this oveview

Thanks Randy.  Nicely done.  Frankjesco

 

Iron

Which method is the lowest cost?

Piezoresistive pressure sensors are suaully the lowest csot which is why they are so widely used

 

Which method has the highest percision?

Highest precision is typically from quartz piezoelectric designs but even piszoresistive is continuous so it is more  amatter of the additinal electronics that determines precision.

Blogger
ericolaf - Yes, this is where you ask Randy questions.

If you familiar with Honeywell FS series pressure sensor, what are the new features in FSA sensor?

 

Iron

Thank you, Randy et al

Iron

It was an informative session

Iron

Is this where we ask questions?

Iron

It would be wonderful to have a sensor that can measure the blood pressure waveform (0 0 300 mmHg) and survive up to 2000 psi without losing calibration or damage.

Iron

Thanks Randy and Lauren.

Iron

@DWSY - This is the live chat :)

Thank you very much

 

Iron

Thank you Randy. Good introduction!!

Iron

how do I connect to the live chat?

Iron

Thanks Randy and Lauren

Thank you. Your presentatiopn is very clear.

Thanks Randy and Lauren

Iron

Thanks Randy

it was very informative. Learnt a lot of new things about pressure sensors.

What type  of pressure  must be usee to measure sea level tide

 

Thank you for the class. Will likely not attend in person tomorrow, but will watch the archived presentation and hopefully attend the rest of the week.

Iron

Thank you,

Randy,Lauren,

Great presentation

Iron

great intro, thanks

 

Iron

Thanks DN, digi-key, et.tal.

Iron

Thank you.  Very informative

Iron

Thank you Randy and Lauren!

Iron

Thanks for the session.  A good start.

 

Iron

Thank you Randy and Digikey CEC team.

Iron

interesting and thank you

Iron

Thank you Randy, Thank youu Lauren

Thanks Randy!  Well done.

Thanks Randy and Lauren.  See you tomorrow.

Thank you Randy and Lauren.

Iron

is there a particular sensor architecture that has little drift over time?

Iron

Thanks for the interesting lecture

Randy. thanks for your presentation

REF slide 13, proof pressure. since proof pressure includes the pipes, tubes, or hoses; does an equivalent measurement or specification for shrinkage when vacuum is applied?

Iron

Thanks, Randy.  Good overview.

Iron

Randy thanks great presentation.

Iron

Thanks Randy for a great lecture.

Iron

Can piezo sensors track higher frequency (100 Hz) pressure changes?

Thanks Randy and Lauren.

Iron

Later this week will you talk about EMI/RFI on smart sensors?

Iron

thanks Randy and Lauren

Iron

good intro thanks Randy

Iron

Thank you Randy, Design News, and Digi-Key

Gold

Thank you Randy, Lauren & Digi-Key!

See y'all tomorrow

Iron

at least hourly, changes in weather will prompt more frequent updates

prefer inches of H20

Iron

ATC is requirred to give barometer readings which are updated hourly

yes but as weather fronts move in the pressure changes

 

Iron

is there a particular sensor architecture that has little drift over time?  

 

Iron

We are on slide 23.

Platinum

Randy, are the threaded connections an IP tapered thread?

air trafic control provides altimeter setting information enroute if requested

Iron

referenced to sea level

 

Iron

what happens with altimiters if the barametric pressure changes while in flight?

 

Iron

We are on slide 22. 

Platinum

We are on slide 21. 

Platinum

We are on slide 20.

Platinum

yes altimeters have to be set to current barometric pressure

Iron

We are on slide 19.

Platinum

We are on slide 18.

Platinum

Where do the constants come from on slide 16?

Iron

Do all altitimeters need to be calibrated to current air pressure before use?

 

Iron

What is the multiplier for hecto?

We are on slide 17.

Platinum

We are on slide 16.

Platinum

We are on slide 15.

Platinum

PSI is what I am use to.

Iron

Is span = range?

 

Iron

We are on slide 13.

Platinum

I would specify pressure for my application in mmHg, kPa, or psi.

We are on slide 12.

Platinum

What is the offset in the graph represent ?

Don't bother teaching things I can find out with a 3 second google search.

 

Iron

We use KPA and sometimes PSI

Pressure spec -- typically milliBar

Iron

We are on slide 11.

Platinum

Which unit of pressure is used for what type of pressure sensors and why ?

Asolute is referenced to a vacuum, guage to a reference pressure, usually ambient and differental to the difference between the two ports. In atmpsphere the three gages would read, respectively 14.7, 0 and 0

 

Currently, I don't measure pressure, but if I did it would most likely be in PSI

Iron

I cant see the live audio icon

 

Iron

for differential - psi

for altitude, absolute - kpa

Iron

I am looking to work with depth water pressure. 

Iron

psi (a & g), bar, inches H2O

Iron

I have used Torr units for vacuum testing

Iron

I've used feet of water and PSI

?Randy, where are teh reference notes you mentioned?

Iron

Randy's question was: How do you specify pressure for your application?

Platinum

inches Hg, PSI, PSIG

Always Inches of Mercury, it's what the FAA uses in its regulations.

Randy's? just use psi

MMHg, psi and kPa.

Iron

We are on slide 9. 

Platinum

I'm in MEMS area. Usually the equipment use Torr. or micron

Iron

In the US, use imperial units so typically PSI, pounds per square inch

 

Iron

Randy's question was: How do you specify pressure for your application?

Platinum

I used in PSI and BAR

Iron

Slide 8

In Europe aslo is used atmosphere (atm) as preasure 1atm=1024 mbar

 

Iron

We are on slide 8.

Platinum

In my case this is not audio blocked... sometimes when I wait long enough the audio eventually comes up ...

Iron

My company blocks audio on all "blog" websites

Iron

What is the difference between Absolute, Gauge and Differencial Pressure Measurements Please explain.

We are on slide 7.

Platinum

I think I looked a MEMS based sensor a few years ago

Iron

IE and FF does not work for me from some time ago (Win7, 64-bit, corporate network, MS Domqain controlled).

I cannot do the live for over a month or so ...

But I can watch and listen to the archives

Iron

If your company has blocked the audio, you may have to listen to it when it gets archived (after the show), in the archive section.

 

Iron

Turn off your flash blocker addon/extension

Iron

I have used pressure sensors in HVAC project

Iron

Audio fine here. Safari.

yes, audio with FF

Iron

Yes. I have audio. I'm using Chrome

Iron

I'm not able to attend the meeting

 

Iron

Yes for audio (Chrome)

 

Iron

does anyone have audio?

Iron

I haven't used any pressure sensing technology, yet.

Iron

Firefox working for me

Iron

We are on slide 6.

Platinum

I do not use pressor sensors.

Iron

Firefox does not play it live either

Iron

have used piezoresistive

Iron

We are trying to fabricate a capacitive sensor using polymer membrane instead of silicon.

Iron

I do not use any technology to measure pressure.

I am using pressure transducer from Hydac

Iron

No sensor preference without a project, but a MEMS sensor would be most likely.

Iron

we do pressure sensing, tech is unknown. We get a 4-20mA output

Iron

If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. And finally, some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

different types are used but have not used mems.

Iron

Use wheatstone bridge device.

Iron

Not currently doing pressure sensing.

Iron

ss diaphram, strain gauge, piezoelectric & ceramic cap

Iron

I haven't used pressor sensors in a project yet

automotive pressure sensors

We are on slide 5.

Platinum

Sense pressures up to 15,000 psi in pipe.

Iron

I use silicon capacitive sensors for primary measurement of altitude and airspeed, and silicon piezoresistive sensors for the redundant channel.

we use piezoresistive

 

Iron

Currently, I have designed pressure sensors using strain-gages

Iron

Currently, I'm not using any tech

Iron

stainless steel or MEMS piezoresistive

Iron

Have been using MEMS piezoresistive.  Also SS strain gages.

Iron

Silicon piezoresistive

 

Iron

we typiclaly use MEMS element on a wheatstone bridge

mechanical meters

Iron

Randy's? all transducer used are MEMs

Pressure Sensor: Using BOSCH BMP180 and similar

Iron

using Piezo and mems type

Yes, MEMS, both types.

Iron

No, I'm not currrently doing any sensing pressure project.

Iron

Also differential pressure in the low pascal range.

Silicon piezoresistive

Iron

I don't know what we're using.

Iron

Just interested in sensing in general in embedded systems. Pressure sensing seems as good a place to start as any.

Iron

Usually blood pressure/waveform.  But also fluid delivery pressure.

 

Iron

no current sensor being used

Iron

currently not using pressure sensing in design, but looking into it.

Which method is the lowest cost?

Which method has the highest percision?

 

Iron

if you cannot hear, try firefox rather

Iron

Sensor1 - No, unfortunately there isn't. If your company is blocking the live audio stream, you will be able to listent o it on-demand immediately following the class. People don't experience any issues with the audio for the archived version.

We are on slide 4.

Platinum

Randy's question was: For pressure measurements, what technology do you normally use?

Platinum

Currently, I have no project sensing pressure

Hello i cant able to hear the voice

 

Iron

We have used up to 300KPA for drilling systems for air and hydraulics

Is there a dial in number to hear the audio. Our company is blocking the webcast

 

Iron

no pressure sensing project ; just curious

Iron

Hi, everybody from HB-Germany

 

Iron

few parameters - altitude/barometric, flow or no flow, absolute pressure

 

Iron

Randy's? have used pressure in pass. mostly hall effect, accelerometers and gyros.

water or air pressure

Iron

At the moment, i am getting familiar with these sensors

Iron

process pressure, liquid, steam, air

Iron

Hydraulic Pressure transducers.  LVDT's also

@rblouin from Montreal, QC  ; I am too in Montréal

Iron

no pressure sensing required yet.

Iron

Not measuring pressure at this time

Iron

Hello Raj from Orlando, FL

 

Iron

hydraulic fluid and pressurized air

Currently not measuring

Iron

Manifold absolute preasure on CAN bus.

Iron

I am not working sensing pressure.

Iron

Not part of current projects.

Iron

hydraulic pressure

 

Iron

Using pressure to sense water level in a tank.

 

Iron

Right now just prepping for future R&D projects

Hydraulic Pressure..

Iron

Low pressure in liquid ~25 psi.

I am measuring pump pressure for oil field applications

Iron

Pressure -- Altimiter --

Iron

not sensing any pressure (yet)

Not currently investigating pressure, but may need to accurately measure relative altitude via air pressure measurements

Iron

I usually work in torr absolute

Iron

I am not currently working on any Pressure sensor project. But I might in near future.

I use pressure sensos for measuring airplane altitude and airspeed.

Weather station (barometric)

Iron

millibars atmosperic pressure

Iron

altitude / baro pressure measurement.

Iron

We're using accelerometers. 

Iron

Currently don't have a pressure measurement related project.

Iron

No current projects sensing pressure

Gold

Yes - currently sensing fluid pressure from 0-30psi in a catheter.

Iron

I'm not currently measuring pressure

Iron

Atmospheric pressure

Iron

We are on slide 3. 

Platinum

Randy's question was: If sensing pressure is part of a current project, what is the measurement?

 

Platinum

Hello from San Diego

Iron

Hello from San Antonio

How are you Randy?

Iron

Hello from Montreal, QC

Iron

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Hello from Calgary

 

Hello from Co Springs!

Iron

Hello from Longmont, CO

Iron

Hello from Chicago

Iron

Hello from sunny New York.

Iron

hello from southwest Ohio

Iron

Hello from SW Michigan

Iron

Hello from Cedar Park TX

Iron

Hello from Oviedo (Spain)

Iron

Hello from Kansas

 

 

Iron

Hello all from Saginaw, MI

 

Greetings from Europe

Iron

Howdy from Tomball TEXAS

Iron

Hello from Beavercreek, OH

Hello from Winston-Salem, NC

 

Iron

Hello from Pittsburg, KANSAS

Iron

Hello from the midwest

Iron

Hello from Rochester, New York USA

Iron

Hi from Monticello Iowa

Aloha from sunny Montana

Gold

Greetings from Bangalore,India !!

 

 

Iron

Greetings from Plymouth, MN!

Iron

greetings from slc ut

Checking in from outside Philadelphia, PA

Iron

Hello from sunny Valdez. 32 degrees out.

Signing in from COS

Iron

Thank you for the exlanation below with regards to the PDH.

Iron

Hi Lauren. How are you today?

Iron

You are eligible to earn IEEE Professional Development Hours by attending these courses and participating in the chat function. Additionally, we are no longer using the points system, offering "graduation", or giving grades. The IEEE hours are taking the place of that. There are some important things for you to know about earning the hours. The most important ones are that you need to attend these courses live, you need to attend a minimum of two of them per semester, you need to fill out a course evaluation form within 2 weeks of the end of the class, you need to attend 4 out of the 5 classes per course, and you need to participate in the chat function every day you attend. Please click on the link at the top of this page that says "How do I earn IEEE professional development hours" to read all of these important details and more.

Platinum

Good afternoon from Florida

Hi. It's a great day to talk about sensors. We will do that in about 30 minutes.

Blogger

Hello from Culiacan Mexico

 

Hello from Edmonton, AB

Iron

Happy Monday from Buffalo, NY!

Iron

Hello from Kansas City

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY and be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using #DigiKeyCEC.

Platinum

How are you Randy? I am looking forward for your lecture.

Iron

Hello from Summerville, SC

Iron

Good afternoon from sunny Minnetonka, MN.

Iron

Hello from Boston. Good afternoon Randy

 

 

Hello from Hudson's Hope BC

Iron

hello from Timisoara, Romania

Iron

gorgeous Houston online

Iron

The streaming audio player will appear at the top of this web page when the show starts at 2 PM Eastern time today. When you see it, click on the play button to start the audio. Note however, that some companies block live audio streams. If when the show starts, the audio bar doesn't appear or you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. Also, make sure your flash player is updated with the current version. If that doesn't work, the class will be archived immediately following our live taping. You shouldn't experience any problems with the audio when listening on-demand.

Platinum

Hi from rainy Panama City, FL.

Iron

Hello from sunny SE Lake Simcoe Ontario Canada.

Iron

Hello from Chicago

Iron

Greetings from Somewhere on the Niagara Frontier.

Iron

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Platinum

Greeting from Ghana @ work

Iron

Good to see you with us again. I have downloaded the slides and saved them to desktop and hope to see you soon. Thanks...

Iron


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