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High temperature sensors — Parallax Forums

High temperature sensors

ArchiverArchiver Posts: 46,084
edited 2002-12-07 19:11 in General Discussion
I've seen a bunch of stuff on sensing temperature with the stamp. Has
anyone found sensors that operate at higher temperatures? I'd like to
build an exhaust gas temperature (EGT) setup for my model
helicopters.

I don't really know what the temperature range might be though I've
done a little looking around and found that gasoline engines operate
up to 1200 degrees F. From my truck driver days I recall that the
diesel pyrometer went up to about 900 degrees F. The model engines
run on methenol and a fair amount of it escapes down the pipe -
probably cooling the exhaust quite a bit.

Anyone with some thoughts on this?

-Eric

PS Sure is great that this resource is here...

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-12-05 21:14
    Eric!

    I've done some research on that subject.

    look at www.emesys.com, they have excellent pages on interfacing
    thermocouples.
    My measurements gave me ~500C (~900F) on the exhaust of my .90
    twostroke SuperTigre it varies a lot depending on load and mixture.
    Look for a sensor type K capable of 1000C, they are very common,
    quite cheap and accurate (and very small).
    And place your sensor as close to the exhaust port as possible.

    Good luck!

    /Douglas



    --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > I've seen a bunch of stuff on sensing temperature with the stamp.
    Has
    > anyone found sensors that operate at higher temperatures? I'd like
    to
    > build an exhaust gas temperature (EGT) setup for my model
    > helicopters.
    >
    > I don't really know what the temperature range might be though
    I've
    > done a little looking around and found that gasoline engines
    operate
    > up to 1200 degrees F. From my truck driver days I recall that the
    > diesel pyrometer went up to about 900 degrees F. The model engines
    > run on methenol and a fair amount of it escapes down the pipe -
    > probably cooling the exhaust quite a bit.
    >
    > Anyone with some thoughts on this?
    >
    > -Eric
    >
    > PS Sure is great that this resource is here...
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-05 23:35
    Hey Douglas, that's some good stuff - thanks!

    I looked at the Omega Engineering site - they have an overwhelming
    range of sensors available. It's like going to 31 flavors and all I
    want is vanilla!

    Would you be willing to share what sensor you chose?

    -Eric
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-06 00:48
    There are 2 ways to incorporate a thermocouple.

    One is to buy a thermocouple TRANSMITTER. this will ouput a 4-20mADC
    value and cost between $50.00 and $100.00 plus the sensor and housing.

    https://www.dwyer-inst.com/htdocs/temperature/TemperatureSensors.html

    for some good data.

    https://www.dwyer-inst.com/htdocs/temperature/651.html
    picture

    The aluminum cast housing uses a thermowell to allow the thermocouple
    to be exposed to the porcess temperature but protected it from the
    process.
    http://www.aone.com.tw/proof.htm

    The 3 items comprise one sensing point. You should find all three
    from one manufacturer. MANY MANY suppliers.


    The other way is to input the thermocuople wire direct to your ADC.

    The problem is that a thermocouple generates a microvoltage signal
    from the connection of two dissimilar metals. the types of metals is
    the temperatre range selection. the trick is that you MUST have a
    direct run from the sensing point to your op-amp. the temperature
    will be measured at the sensing point AND your wire connection.
    temperature is measued by dissimilar metals and your screw terminals
    and the thermocouple wire are disimilar. THEY show temperature
    readings too!

    Means you need to correct for the wiring connection. There are lots
    of sites that show you how to do that.

    If you want a cheap device check out home furnace thermocouples.
    Home Depot has gas furnace thermocouple for about $5.00

    http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?
    CNTTYPE=NAVIGATION&CNTKEY=market%
    2fpg_zip_code.jsp&BV_SessionID=@@@@1932421655.1039135431@@@@&BV_Engine
    ID=ccckadcgmdlediicgelceffdfgidgkj.0&search_text=thermocouple&DRC=4

    yikes ! that is a link and a half. search home depot's site for
    thermocouple. The unit I saw was 30 millivolt. may be fun to play
    with.


    Dave





    --
    - In basicstamps@y..., "Douglas Rydstroem" <rdo@s...> wrote:
    > Eric!
    >
    > I've done some research on that subject.
    >
    > look at www.emesys.com, they have excellent pages on interfacing
    > thermocouples.
    > My measurements gave me ~500C (~900F) on the exhaust of my .90
    > twostroke SuperTigre it varies a lot depending on load and mixture.
    > Look for a sensor type K capable of 1000C, they are very common,
    > quite cheap and accurate (and very small).
    > And place your sensor as close to the exhaust port as possible.
    >
    > Good luck!
    >
    > /Douglas
    >
    >
    >
    > --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > > I've seen a bunch of stuff on sensing temperature with the stamp.
    > Has
    > > anyone found sensors that operate at higher temperatures? I'd
    like
    > to
    > > build an exhaust gas temperature (EGT) setup for my model
    > > helicopters.
    > >
    > > I don't really know what the temperature range might be though
    > I've
    > > done a little looking around and found that gasoline engines
    > operate
    > > up to 1200 degrees F. From my truck driver days I recall that the
    > > diesel pyrometer went up to about 900 degrees F. The model
    engines
    > > run on methenol and a fair amount of it escapes down the pipe -
    > > probably cooling the exhaust quite a bit.
    > >
    > > Anyone with some thoughts on this?
    > >
    > > -Eric
    > >
    > > PS Sure is great that this resource is here...
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-06 00:57
    Hi Eric,

    If you want to play, I have some thermocouple wire, I'm not sure what
    type, but it is easy to find out. I could send you a 6" section.
    all you need do is twist the wires together to get it to respond.
    Electro-weld it to a washer and bolt that on your unit somewhere.
    That's what they do on engines.

    pay for shipping (34 cents?) and post your test results (not code) on
    here. how is that for an exchange ? Heck, just let me know where to
    send it, I'm in the holiday mood. Besides it would cost you 34 cents
    to send me 34 cents!

    contact me off list.

    Dave
    (South New Jersey)


    --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > I've seen a bunch of stuff on sensing temperature with the stamp.
    Has
    > anyone found sensors that operate at higher temperatures? I'd like
    to
    > build an exhaust gas temperature (EGT) setup for my model
    > helicopters.
    >
    > I don't really know what the temperature range might be though I've
    > done a little looking around and found that gasoline engines
    operate
    > up to 1200 degrees F. From my truck driver days I recall that the
    > diesel pyrometer went up to about 900 degrees F. The model engines
    > run on methenol and a fair amount of it escapes down the pipe -
    > probably cooling the exhaust quite a bit.
    >
    > Anyone with some thoughts on this?
    >
    > -Eric
    >
    > PS Sure is great that this resource is here...
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-06 04:01
    Maxim sells a thermalcouple to digital converter IC that has a
    sensing range up to 1000C.

    http://pdfserv.maxim-ic.com/arpdf/MAX6675.pdf

    I am using the max6674 to measure temperature up to 125C. It works
    pretty good.

    Jason


    --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > I've seen a bunch of stuff on sensing temperature with the stamp.
    Has
    > anyone found sensors that operate at higher temperatures? I'd like
    to
    > build an exhaust gas temperature (EGT) setup for my model
    > helicopters.
    >
    > I don't really know what the temperature range might be though I've
    > done a little looking around and found that gasoline engines
    operate
    > up to 1200 degrees F. From my truck driver days I recall that the
    > diesel pyrometer went up to about 900 degrees F. The model engines
    > run on methenol and a fair amount of it escapes down the pipe -
    > probably cooling the exhaust quite a bit.
    >
    > Anyone with some thoughts on this?
    >
    > -Eric
    >
    > PS Sure is great that this resource is here...
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-06 15:58
    One of the best things about this group is the wide range of knowledge and
    experience available. I find the suggestions like the IC listed below very
    helpful since I don't have time to go looking for all the new neat latest
    things outthere.

    Glad to be a part of this. I've learned a lot

    Original Message
    From: jbirnsch [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=jzRTtbfiI-gaswgDPF1U65ehNb2prJHUO7Lg8u0vFqCuWpfSo3JpdiyB7fS-ew_cFwc99v_-N3MI]jbirnsch@v...[/url
    Sent: Thursday, December 05, 2002 11:01 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: High temperature sensors

    Maxim sells a thermalcouple to digital converter IC that has a
    sensing range up to 1000C.

    http://pdfserv.maxim-ic.com/arpdf/MAX6675.pdf

    I am using the max6674 to measure temperature up to 125C. It works
    pretty good.

    Jason


    --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > I've seen a bunch of stuff on sensing temperature with the stamp.
    Has
    > anyone found sensors that operate at higher temperatures? I'd like
    to
    > build an exhaust gas temperature (EGT) setup for my model
    > helicopters.
    >
    > I don't really know what the temperature range might be though I've
    > done a little looking around and found that gasoline engines
    operate
    > up to 1200 degrees F. From my truck driver days I recall that the
    > diesel pyrometer went up to about 900 degrees F. The model engines
    > run on methenol and a fair amount of it escapes down the pipe -
    > probably cooling the exhaust quite a bit.
    >
    > Anyone with some thoughts on this?
    >
    > -Eric
    >
    > PS Sure is great that this resource is here...


    To UNSUBSCRIBE, just send mail to:
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    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-12-07 17:48
    I agree, but I have found very few places to buy the Maxim MAX6675. Do
    anyone have a good source for these chips? They are available from the web
    site with a 7 week lead time...

    -Phil

    Original Message
    From: Sadler Porter [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=A13CN9kTCfILfYdVjw2lU26FuEY7fqTWjD3m2rsMnE1PotrGbRbFlkuWpbVh10mJqwSP3HlPT0aYBZFO4-SEP8txHg]porter.sadler@s...[/url
    Sent: Friday, December 06, 2002 9:58 AM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] Re: High temperature sensors


    One of the best things about this group is the wide range of knowledge and
    experience available. I find the suggestions like the IC listed below very
    helpful since I don't have time to go looking for all the new neat latest
    things outthere.

    Glad to be a part of this. I've learned a lot

    Original Message
    From: jbirnsch [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=jA_lEpdcuO5VqEDIrAfW9ZJGzI9HTQkgx-Ba1uwBnp7pOaPl_RIfzGkoQT_9TLSjQ47IDN8J]jbirnsch@v...[/url
    Sent: Thursday, December 05, 2002 11:01 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: High temperature sensors

    Maxim sells a thermalcouple to digital converter IC that has a
    sensing range up to 1000C.

    http://pdfserv.maxim-ic.com/arpdf/MAX6675.pdf

    I am using the max6674 to measure temperature up to 125C. It works
    pretty good.

    Jason


    --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > I've seen a bunch of stuff on sensing temperature with the stamp.
    Has
    > anyone found sensors that operate at higher temperatures? I'd like
    to
    > build an exhaust gas temperature (EGT) setup for my model
    > helicopters.
    >
    > I don't really know what the temperature range might be though I've
    > done a little looking around and found that gasoline engines
    operate
    > up to 1200 degrees F. From my truck driver days I recall that the
    > diesel pyrometer went up to about 900 degrees F. The model engines
    > run on methenol and a fair amount of it escapes down the pipe -
    > probably cooling the exhaust quite a bit.
    >
    > Anyone with some thoughts on this?
    >
    > -Eric
    >
    > PS Sure is great that this resource is here...


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



    [noparse][[/noparse]Non-text portions of this message have been removed]


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
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  • ArchiverArchiver Posts: 46,084
    edited 2002-12-07 19:11
    Maxim is good for a few test samples.

    Dave




    --- In basicstamps@yahoogroups.com, "Phillip Kocmoud" <pkocmoud@h...>
    wrote:
    > I agree, but I have found very few places to buy the Maxim MAX6675.
    Do
    > anyone have a good source for these chips? They are available from
    the web
    > site with a 7 week lead time...
    >
    > -Phil
    >
    >
    Original Message
    > From: Sadler Porter [noparse][[/noparse]mailto[noparse]:p[/noparse]orter.sadler@s...]
    > Sent: Friday, December 06, 2002 9:58 AM
    > To: basicstamps@yahoogroups.com
    > Subject: RE: [noparse][[/noparse]basicstamps] Re: High temperature sensors
    >
    >
    > One of the best things about this group is the wide range of
    knowledge and
    > experience available. I find the suggestions like the IC listed
    below very
    > helpful since I don't have time to go looking for all the new neat
    latest
    > things outthere.
    >
    > Glad to be a part of this. I've learned a lot
    >
    >
    Original Message
    > From: jbirnsch [noparse][[/noparse]mailto:jbirnsch@v...]
    > Sent: Thursday, December 05, 2002 11:01 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: High temperature sensors
    >
    > Maxim sells a thermalcouple to digital converter IC that has a
    > sensing range up to 1000C.
    >
    > http://pdfserv.maxim-ic.com/arpdf/MAX6675.pdf
    >
    > I am using the max6674 to measure temperature up to 125C. It works
    > pretty good.
    >
    > Jason
    >
    >
    > --- In basicstamps@y..., "tinkputterfutz" <models@d...> wrote:
    > > I've seen a bunch of stuff on sensing temperature with the stamp.
    > Has
    > > anyone found sensors that operate at higher temperatures? I'd like
    > to
    > > build an exhaust gas temperature (EGT) setup for my model
    > > helicopters.
    > >
    > > I don't really know what the temperature range might be though
    I've
    > > done a little looking around and found that gasoline engines
    > operate
    > > up to 1200 degrees F. From my truck driver days I recall that the
    > > diesel pyrometer went up to about 900 degrees F. The model engines
    > > run on methenol and a fair amount of it escapes down the pipe -
    > > probably cooling the exhaust quite a bit.
    > >
    > > Anyone with some thoughts on this?
    > >
    > > -Eric
    > >
    > > PS Sure is great that this resource is here...
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject and
    > Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    >
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject and
    > Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
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