"Endymion Ponsonby-Withermoor III"
<m_a_r_v_i_n@para----and----.want-to-do.coe.ukk> interrupted my
perusal of alt.binaries.erotica.pornstars.80s to say:
>"Kelvin" <kelvin_xq@yahoo.com> wrote in message
>news:41733334$1@news.starhub.net.sg...
>> What I need is a minituare temperature sensor that can sense the room
>> temperature between 10C to 40C, precision of up to 0.1C.
>
>Dallas do a little 8-pin thing, with I2C interface.
>
>There's also a 3-pin LM?35? give a voltage out proportional to temperature.
> (One variant has an offset to allow -ve temperatures)
The LM75 is a I2C thermostat and thermometer, -128 to 128 �C.
Accuracy is a problem though, +/- 0.5 �C
---
Martin Pot (pot@xs4all.nl)
http://www.xs4all.nl/~pot
Plutonium lasts twenty-five millennia, but arsenic is forever.
- Terry Pratchett -
Reply by Paul E. Bennett●October 18, 20042004-10-18
Kelvin wrote:
> What I need is a minituare temperature sensor that can sense the room
> temperature between 10C to 40C, precision of up to 0.1C.
>
> Has anyone seen such information?
>
> Thanks.
Further to my earlier posting you should contact this company. Where I am
working at present bought a number of Pt100 sensors that are incredibly
small, only cost about �13.00 and follow a very dependable
temperature/resistance curve which is a BS/EN standard. You may find it
easier to ask Morten himself about these devices as I do not think they are
represented on his company's web-site. They operate on the basis of "tell
us what sensors you need we will source them at a competitive price. He has
helped us out with a number of unusual sensor requirements over the past
couple of years.
http://www.sensor-technik.co.uk/
--
********************************************************************
Paul E. Bennett ....................<email://peb@a...>
Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/>
Mob: +44 (0)7811-639972 .........NOW AVAILABLE:- HIDECS COURSE......
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Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************
Reply by Paul E. Bennett●October 18, 20042004-10-18
Kelvin wrote:
> What I need is a minituare temperature sensor that can sense the room
> temperature between 10C to 40C, precision of up to 0.1C.
>
> Has anyone seen such information?
>
> Thanks.
Either a thermocouple (probably K type) or a Pt100 sensor. Personnaly I
feel more confident about the Pt100.
--
********************************************************************
Paul E. Bennett ....................<email://peb@a...>
Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/>
Mob: +44 (0)7811-639972 .........NOW AVAILABLE:- HIDECS COURSE......
Tel: +44 (0)1235-811095 .... see http://www.feabhas.com for details.
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************
Reply by Spehro Pefhany●October 18, 20042004-10-18
On Mon, 18 Oct 2004 11:12:48 +0800, the renowned "Kelvin"
<kelvin_xq@yahoo.com> wrote:
>What I need is a minituare temperature sensor that can sense the room
>temperature between 10C to 40C, precision of up to 0.1C.
>
>Has anyone seen such information?
>
>Thanks.
If you want guaranteed 0.1�C interchangability and accuracy without
calibration, even at a single point, let alone over that range, your
choices are quite limited. A high precision thermistor will just do
it, though with risk of drift.A high precision platinum RTD is the
best solution if you really need that accuracy.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by richard miller●October 18, 20042004-10-18
Analog Devices: AD590
"Kelvin" <kelvin_xq@yahoo.com> wrote in message
news:41733334$1@news.starhub.net.sg...
> What I need is a minituare temperature sensor that can sense the room
> temperature between 10C to 40C, precision of up to 0.1C.
>
> Has anyone seen such information?
>
> Thanks.
>
>
>
Reply by CBFalconer●October 18, 20042004-10-18
Endymion Ponsonby-Withermoor III wrote:
> "Kelvin" <kelvin_xq@yahoo.com> wrote in message
>
>> What I need is a minituare temperature sensor that can sense the
>> room temperature between 10C to 40C, precision of up to 0.1C.
>
> Dallas do a little 8-pin thing, with I2C interface.
>
> There's also a 3-pin LM?35? give a voltage out proportional to
> temperature. (One variant has an offset to allow -ve temperatures)
>
> Aside: when the Americans say e.g. "thirty degrees below zero", as
> they use the Fahrenheit scale, where freezing point is 32 degrees,
> what do they mean by this: do they mean "30 degrees below freezing",
> or literally "-30 degrees F" (which is 62 deg below freezing) ?
In this case the OP did specify "10C to 40C".
Most general purpose band-gap voltage standard generators (which I
believe includes the LM??? mentioned above) also deliver a signal
proportional to temperature over some range. All the OP is likely
to need is some form of A/D conversion for this essentially DC
signal. The sensor will already supply both the signal and the
reference voltage.
--
"I support the Red Sox and any team that beats the Yankees"
"Any baby snookums can be a Yankee fan, it takes real moral
fiber to be a Red Sox fan"
Reply by tadchem●October 18, 20042004-10-18
"Endymion Ponsonby-Withermoor III" <m_a_r_v_i_n@para----and----.want-to-do.coe.ukk> wrote in message news:<cl03cv$qln$1@news6.svr.pol.co.uk>...
<snip>
> Aside: when the Americans say e.g. "thirty degrees below zero", as they
> use the Fahrenheit scale, where freezing point is 32 degrees, what do
> they mean by this: do they mean "30 degrees below freezing", or literally
> "-30 degrees F" (which is 62 deg below freezing) ?
Here in the U.S. the phrase "thirty degrees below zero" means exactly
that, *below zero* - i.e. negative Fahrenheit temperatures (-30�F).
Temperatures in the range 0�F to 32�F are simply referred to as
"freezing" temperatures. A temperature of (plus) 30�F is "freezing"
(or sometimes "below freezing") but not "below zero."
Americans *are* rather slow to adapt. It could be worse, though.
Engineers still use Roman Numerals in their reckoning.
Tom Davidson
Richmond, VA
Reply by Norm Dresner●October 18, 20042004-10-18
"Endymion Ponsonby-Withermoor III"
<m_a_r_v_i_n@para----and----.want-to-do.coe.ukk> wrote in message
news:cl03cv$qln$1@news6.svr.pol.co.uk...
> Aside: when the Americans say e.g. "thirty degrees below zero", as they
> use the Fahrenheit scale, where freezing point is 32 degrees, what do
> they mean by this: do they mean "30 degrees below freezing", or literally
> "-30 degrees F" (which is 62 deg below freezing) ?
>
This American means -30F when he says "thirty degrees below zero" in social
conversations since that's the conventional temperature scale. I think that
most Americans mean the same thing. So " ... " is, indeed, 62F below
freezing.
What I mean in engineering and scientific conversations depends on context.
Reply by Norm Dresner●October 18, 20042004-10-18
"Endymion Ponsonby-Withermoor III"
<m_a_r_v_i_n@para----and----.want-to-do.coe.ukk> wrote in message
news:cl03cv$qln$1@news6.svr.pol.co.uk...
> "Kelvin" <kelvin_xq@yahoo.com> wrote in message
> news:41733334$1@news.starhub.net.sg...
> > What I need is a minituare temperature sensor that can sense the room
> > temperature between 10C to 40C, precision of up to 0.1C.
>
> Dallas do a little 8-pin thing, with I2C interface.
>
> There's also a 3-pin LM?35? give a voltage out proportional to
temperature.
> (One variant has an offset to allow -ve temperatures)
Kelvin schrieb in Nachricht <41733334$1@news.starhub.net.sg>...
>What I need is a minituare temperature sensor that can sense the room
>temperature between 10C to 40C, precision of up to 0.1C.
>
>Has anyone seen such information?
If price is not important, use the SMT160 - available in 3-pin transistor
like package and in SO-8 SMD IC. Other forms also available.
Precision is very good, better than 0,1 centigrade. Output is PWM. You can
convert it to analog with a simple RC-filter.
regards -
Henry
--
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