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Thanks for a fine course Randy.

Iron

@ctrlfreek

Thanks for the suggestion about damping and time constant.

@RFengineerUMR

I'd also want to know if any damping was required, some SS diaphragms can include various size restrictors to leave a little time constant preventing unecessary trips or lock-outs

Iron

One topic that I would like to see in the future is the evolution and advancements in RF tech for digital circuitry.

Iron

Signal conditioning and calibration.

Iron

@Randy Frank

Thanks, for your answer about the 5000 psi go/no-go sensor types.

Thanks for the presentations,Randy.  Thanks also to Lauren, Design News, and Digi-Key.

Thanks, Randy, great course.

Iron

Randy for such a high pressure I'd prefer the stainless and strain gauge but I'd be open to newer technology to try

 

Iron

Thanks to Randy, Lauren, digikey and ieee.

That's going to do it for today and this week. Thanks for attending.

Blogger

What sensor types would you prefer for measuring hydraulic fluid for a 5,000 psi go/no-go output?  Ambient temp would be industrial range.

Technologies that I am familiar with that address 0-5000 PSI include stainless steel diaphragm with strain gage (variety of types), ceramic piezoresistive and quartz. Setra, Ashcroft,  PCB Electronics and Gem sensors are among the places to look for more info.

Blogger

None currently above 125C

Iron

Thank you Randy.  Good overview.

Iron

There are pressure switches available, vs pressure sensors.

Iron

Thanks Randy -- know where to look now.

Iron

What sensor types would you prefer for measuring hydraulic fluid for a 5,000 psi go/no-go output?  Ambient temp would be industrial range.

Thank you Randy and Lauren. Have a great weekend.

Iron

@Randy Frank
Thanks Randy ; very informative
Thanks Design News & DigiKey

Talk topic : maybe an overview of other semi-exotic sensors out there (i.e. other than temp. or humidity, for example - then again, perhaps include these ones too !

Iron

Military temperatures

Iron

No, never have to consider media temperatures above 125 deg. C.

Iron

I am looking at using pressure/force sensors for infrasound -- long wave sub-audio signals.

Iron

No applications above 125 deg.

Iron

For a combustion sensor, is there a spec for response time?

I assume there is but I could not find the spec guarantee on a quick search of the manufacturer's website: http://www.optrand.com/

 

Blogger

Accuracies that I typically can get along with are .5% and 1%.

Iron

how about sensors submersible in molten plastic?

 

There was a supplier at Sensors Expo last year showing an etremely small temperature sensor that could be left in the plastic as a disposable sensor without barely impacting the surface quality. I am not aware of other measurements.

Blogger

Thanks Randy, Digikey, DN et al.

Iron

Vacuum pressure sensing, other than a gage type pressure, is a specialty device.  Once you are below a mm of Hg or so, a different sensing mechanism is needed.

Iron

not applicable for extreem designs

Honeywell and others make air flow sensors, primarily for the automotive industry.  Last I checked (several years ago) I couldn't find fluid flow as a standard product.  Though there are industrial applications where this is done.

Iron

Randy is Vacuum premeasured in PSI 

Torr is a common vacuum measurement. However, for vacuum level such as pick and place you frequently see -inches of water specified.

Blogger

Randy's question was: Are there any other topics you would like to see? 

Flow rate would be interesting. all fluid sensors application

Iron

Extremes are corrosive environments and mucky media.  Temp extremes are within mil-spec limits

Iron

Thank you Randy and Lauren.

Also a clarification of the transmission temperature I quotes earlier, a person error, the temperature was 130 degrees C.

 

Can a 125C rated sensor be stretched to operate at 132C?

What is the limiting factor? nonlinearities? actual damage? calibration?

 

While manufacturer's have a bit of latitude at exceeding temperatures, one of the first reasons to specify a particular temeperature range is that the accuracy or some specification cannot be guaranteed outside of that range. Depending on the sensor packaging and connector materials you may or may not be able to stretch the temperature range and get the target life. You probably will not get an imediate failure but unless a manufacturer has specifc knowledge of overtemperature testing or an overtemperature application, they are probably going to tell you to avoid that situation.

Blogger

Thanks Randy. I enjoyed it.

Iron

Hello from Chicago

Iron

Q:Do you have to consider media temperatures above 125C? How much higher?

no worry for that usually all are well below

Iron

Randy's? future topics, all so far have been interesting. sensor conditioning, SDR, GPS, ect. are good subjects.

Thank you very much Randy and Digi-Key.

Good information!!

Iron

Thanks Randy digi-key, Lauren, et.tal.

I would also like a central repository for info, updates and maybe a index of sub-subjects.

Boy I don't want much, do I.

THanks again.

Iron

Thank you Randy and Digikey 

Iron

Thank you very much Randy!

Iron

@Randy and Lauren: i would like to hear about air flow sensors; mass liquid flow sensors; and related signal conditioning.

Iron

Thank you Randy and Lauren

Other topics: Multiple output sensors

Iron

Testing sensors circuits

Iron

Randy is Vacuum premeasured in PSI 

Load cells would be interesting.

Thank you for the course.

Iron

Flow rate sensors would be nice; both liquid and gas.

airflow sensing in laboratory fumehoods with multiple configuration of sashes. thanks, 

Iron

I would like a intell. pressure sensor interface  focus. Thanks digi-key, Lauren, and Frank for a great week. 

Iron

Thanks Randy and Lauren

Iron

Thanks for great lecture series. 

Iron

Thanks Randy and Lauren.  Randy, great set of slides, lots of places to go looking.  Great information.

Fluid flow sensinng ( Medical pumps related)

Iron

Proximity sensors

Iron

Different type of proximity sensors will be  a great topic.

Iron

Thanks!  Good info!

Iron

Thank you so much!  Very interesting.

Would like to see something on Optics.

Iron

Thanks Lauren & Randy. Thanks everyone.

Thank you Randy and Lauren

Iron

Thanks for the very informative lectures

Thanks, both.  Very interesting.

Iron

Software Defined Radio

Iron

Good course, thank you very much

 

Thanks, Randy and Lauren. Great week.

@Randy, Lauren,

Thank you

Have a great weekend

Iron

thank you Lauren and Randy

Iron

Thank you Randy and Lauren

Iron

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

Iron

Application of strain gages and other methods to judge stress in parts.

Iron

Thank you Lauren and Randay.

Iron

Fluid flow sensor

Iron

more pressure sensor

Android

Iron

Thank you Randy and Digikey CEC team.

Iron

thanks Randy and Lauren, it's a great class.

Iron

Thank you Randy and Lauren

Iron

Temperature and acceleration sensors

Iron

I would like to see something on GPS

Iron

Thanks Randy & Lauren!

Iron

Thanks Randy & Lauren!

Iron

Future topics:  more in-depth discussion of sensor signal conditioning.

Iron

Photo Electric Sensors and Proximity sensors

Iron

intelligent sensor interface

Iron

Very interesting.
Thank you Randy, Lauren, and Digi-Key

Gold

 hi goodafternoon. Soram late. My br froze

Thank you Randy, Lauren & Digi-Key!

Have a great weekend, all!

Iron

????@Randy????

Can a 125C rated sensor be stretched to operate at 132C?

What is the limiting factor? nonlinearities? actual damage? calibration?

Randy's question was: Are there any other topics you would like to see? 

Platinum

@alaskaman66: ifm effector means the producer company of that sensor

Iron

No extremes encountered

Gold

We are on slide 19.

Platinum

No extremes - usually just room temperature, etc.

@ Randy, Lauren,

how about sensors submersible in molten plastic?

Iron

We are on slide 18. 

Platinum

Randy, what is ifm effector?

Randy's question was: What extremes have you had to deal with?

 vacuum and hi temp, upto 175 C

Q:What accuracy do you typically require for your sensor?

A: Typically 1 - 5%

Q:Do you have to consider media temperatures above 125C? How much higher?

A:Highest was 175 C was highest

 

 

Iron

We are on slide 17. 

Platinum

Do you have to consider media temperatures above 125C? How much higher?

I have not needed to consider temperature above 12C

We are on slide 16. 

Platinum

no worry for that usually all are well above 

Iron

600+degC above 125degC

Iron

Have worked with transmission oil temperatures at 240 degrees C.

For a combustion sensor, is there a spec for response time?

measure steam and pressures in large HVAC systems

Iron

nothing above 125 C yet

Iron

We are on slide 14. 

Platinum

Usually room temperature, but have gone to +190F.

Iron

No, 125C is satisfactory, as long as that is enough headroom to ensure safe measurement of liquids at or above 100C

Iron

Media temperatures may exceed 125C, the slightly "cooled" output of a gas turbine

Don't have to go above 125C

Iron

Randy's? high temperature is not a problem, yet.

no temperatures above 125C

Iron

No requirement for high temp. the most is 105C

Iron

250 F is about as high as we go here.

Iron

nope not in my applications

Iron

yes 350C in combustion process

Iron

Media temps beyond 125 deg C are not required.

Iron

No: 125C is above our needs.

Iron

No.  Usually extended room temperature, like industrial.

Iron

nothing abovee 125 deg C

Iron

I work near room temp.

Iron

none above 125 deg C

Iron

No requirement above 125C.

Iron

Yes, 200 deg. cel.

Iron

no, 125C is the most we have had to deal with

Iron

have not needed extreme tolerance

Gold

We are on slide 13. 

Platinum

No temps above 125 deg C

Iron

Randy's question was: Do you have to consider media temperatures above 125C? How much higher?

Platinum

Equally important for us would be 1KHz response

Iron

1% or better would probably be fine

Iron

We are on slide 12.

Platinum

What accuracy do you typically require for your sensor?

Typically, we require 1-2% accuracy

Randy's? accuracy needed is not needed, maybe 1 or 2%. and currently, temperature range is not great.

 

We are on slide 11.

Platinum

no extremes ; std precision

Iron

1 - 2% is good for us

1% is acceptable. Price can possibly get me to accept something else.

Iron

Also would be NIST traceable for calibration

typically 1% accuracy is good

Iron

We are on slide 10.

Platinum

1% with low over all cost.

Iron

I rely more on consistancy than accuracy. The control software would adjust higher or lower from the current pressure as needed.

Iron

1 % accuracy have dealt with.

Iron

application dependant.  Mostly 0.5%, sometimes 0.1%

Iron

We needed 0.01%.  We made our own sensors because all commercial piezoresistive sensors used aluminum bond wires, which would corrode over time.

.25 to 1% accuracy

Iron

A little lower 0.25% accuracy would be acceptable in typical envisioned applications.

Iron

Usually +/- 1 percent is fine

Iron

1% is usually sufficient.

Iron

Don't need .25%; plus or minus 1 psi

Higher accuracy .25% or better

Iron

Can usually tolerate single digit % accuracy

for HVAC we try for 1%, but most of the time 5% will do

Iron

+/- 0.25% is good but look for /- 9.10%

Iron

We are on slide 9. 

Platinum

Average 5% occasional 1%

 

 

Iron

Randy's question was: What accuracy do you typically require for your sensor?

Platinum

We tolerate 1-2% error to keep costs low

Iron

extreme temperatures

Iron

We are on slide 8. 

Platinum

We are on slide 7. 

Platinum

We are on slide 6. 

Platinum

What extremes have you had to deal with?

I have not had to deal with extremes yet.

We are on slide 5. 

Platinum

Hi temperature 80+ C

Iron

-40 to 120C Conformance requirement

Iron

we flew a modem to Mars once, that was somewhat extreme.

Iron

We characterized out pressure sensors for a temperature range from -60 to +125C.

Extreme heat and cold temperatures. Pressures at 15,000PSI

Iron

hi, just got audio

 

Iron

No real extremes

 

Iron

We had to use sensor for temperature to minus 60 C for the Canadian artic to plus 80C and extrem vibration for mine drill equipment

Hi all, Temperature greater than 200 deg. Cel.

Iron

No really unusual extremes in projects yet.

200 C or 50,000 rpm or radioactive exposure

Iron

My experience just required high accuracy, about 0.01%FS, for avionics air data systems.  This is just the norm for that application, so I don't know if it is so extreme.  Tough requirement, though!

High pressure, dynamic, high cycles

Iron

Nothing so far, mostly hydraulic pressure

Iron

Magnesion Chloride exposure

Iron

Randy's? haven't really needed to worry to much about extremes. generally just industrial.

Combustion in a small cylinder.

Iron

Not very extreme - just atmospehric range.

Iron

No extremes, just timing.

Iron

Not sure if pH of 3 is considered extreme

Iron

The need to provide for isolation from galvanic contact.

Iron

Have had both low pressure, inches of water and somewhat high pressure, 5000 spi.

Temperature - -55 to +85C

Accuracy

Iron

Temp extremes: -40C to +100C

Iron

High pressure.  Impact.  Waterproof.

Iron

hydraulic pulsation @ 4k psi

Iron

I am interested in a high temperaryre and pressure environement.

Large temperature swings from well below freezing to approx 100 deg F

Iron

-40F to +125F for automotive.

Iron

No extremes to date

 

Iron

Salt water, Lightning

Iron

Human body compatibility.

Iron

Really haven't encountered "extremes" in any applications thus far.

Iron

Nothing extreme so far

Hello form Culiacan Mexico

No real extremes - pretty "normal" stuff

Iron

have not dealt with extremes

Gold

We are on slide 3. 

Platinum

Google Glass 1-day sale to-the-public next week on the 15th. qtys are limited.

Iron

Randy's question was: What extremes have you had to deal with?

 

Platinum

hello from the midwest

Iron

Hello from Rio Ranch, NM

Hello from Calgary Alberta

Hello from Cypress, TX

 

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 Philippines

Good evenning from Valladolid, Spain

The day that start the holydays week in all the peninnsule.

Iron

Hello from Chicago

Iron

Hello from SW Michigan

Iron

Hello from Co Springs.

Iron

Hi from Rocklin, CA

 

Iron

Hello from Oviedo, Spain

Iron

Hello from Albuquerque.

Iron

Corona here. Hello.

Iron

Hello from Winston-Salem

Iron

Hello from Kansas City.

hello everyone from Timisoara, Romania

Iron

Good afternood from Minnetonka, MN.

Iron

Hello from Longmont, CO

Iron

Good Morning from Valdez

Don't forget to re-download Yesterday's slides - two more have been added.

Iron

Thanks, Lauren.  I downloaded the slides and they're alll there.

Hello from Beavercreek, OH

Happy Friday everyone, from sunny Buffalo, NY!

Iron

hello from Mishawaka

Iron

Hello from Philippines.

Hello from Hudson's Hope BC

Iron

Hello from Thornville, Ohio

Iron

Signing in from COS

Iron

Hello from Pittsburg

Iron

Hello from Montana

Gold

Greetings from Plymouth, MN!

Iron

The slides from yesterday's class have been updated. All 27 slides are now there. 

Platinum

Hello from Kansas

Iron

Greetings from Somewhere on the Niagara Frontier.

Iron

Hello from Eastern Mich

Iron

@Lauren Looks like the slides from yesterdays lecture which were supposed to have been updated have not I am still getting the deck with 25 instead of 27 slides

Iron

Hey Everybody.  TGIF

Iron

Happy Friday to everyone.

Iron

Hi from Summerville, SC

Iron

Happy Friday from NC...

Iron

greetings from slc ut...

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

Hi! We're just one hour away from kicking off today's session.

Blogger

Howdy from Tomball, TEXAS!

Iron

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

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

slides already downloded,great

Iron

Greeting from Ghana @work

 

Iron

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

Platinum


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