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.
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.
IC's can do that. googleit
Dear Kelvin:
Thermistors are ideal.
David A. Smith
Do you want a temperature "sensor" or a temperature "logger" ?
A temperature is about the size of a peanut with wires coming out of it.
A logger will measure the voltage across the sensor, that voltage is proportional too the temperature on it.
Loggers come in lots of sizes and some are battery operated. Storage will store past samples in the hundreds or thousands of samples.
The big question that a group like this would like to know is:
Do you want to _buy_ or _build_ a temp logger ?
Kelv> What I need is a minituare temperature sensor that can sense the room
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) ?
Richard [in PE12]
Kelvin schrieb in Nachricht ...
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
temperature.
LM335 at National Semiconductor
Norm
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.
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
Analog Devices: AD590
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
Either a thermocouple (probably K type) or a Pt100 sensor. Personnaly I feel more confident about the Pt100.
-- ******************************************************************** Paul E. Bennett ....................
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.
-- ******************************************************************** Paul E. Bennett ....................
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