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'[OT] Temperature Sensor (again)'
1999\10\14@131523 by Marcelo Yamamoto

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Hi all,

Does anyone can tell me where I can find a temperature sensor up to 300oC
(572oF)?
I will appreciate any help.
TIA

Marcelo Y.
spam_OUTm_yamamotoTakeThisOuTspamuol.com.br

1999\10\14@165232 by Reginald Neale

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>Hi all,
>
>Does anyone can tell me where I can find a temperature sensor up to 300oC
>(572oF)?
>I will appreciate any help.
>TIA
>
>Marcelo Y.
>.....m_yamamotoKILLspamspam@spam@uol.com.br

RTD and thermocouple sensors can operate reliably at this temperature. Can
you tell us anything about the other requirements - physical size,
reliability, cost, volume etc.?

Reg Neale

1999\10\14@172731 by Marcelo Yamamoto

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Reg wrote:

>RTD and thermocouple sensors can operate reliably at this temperature. Can
>you tell us anything about the other requirements - physical size,
>reliability, cost, volume etc.?
>
>Reg Neale
>

Ok. I'm looking for a temperature sensor about 15mm length (or less) like a
PT-100. Cost is my problem. I will purchase about 1k/month. I want (of
course) a reliable piece but not so accurate as I can adjust its curve by
software.

Thanx,

Marcelo Y.
m_yamamotospamKILLspamuol.com.br

1999\10\14@174843 by William K. Borsum

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Try Micron Instruments 805-522-4676  <http://www.microninstruments.com>
They make truly tiny metal film sensors, including strain gages not much
bigger than the bump on 2 mil gold bond wire.

Also, try OMEGA for thermocouples and just about anything else.  Pricey,
but like 7-11's, they got it.

Kelly


At 03:13 PM 10/14/99 -0300, you wrote:
{Quote hidden}

William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems
<EraseMEborsumspam_OUTspamTakeThisOuTdascor.com> & <http://www.dascor.com>San Diego, California, USA

1999\10\14@185853 by Wagner Lipnharski

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Marcelo Yamamoto wrote:
>
> Reg wrote:
>
> >RTD and thermocouple sensors can operate reliably at this temperature. Can
> >you tell us anything about the other requirements - physical size,
> >reliability, cost, volume etc.?
> >
> >Reg Neale
> >
>
> Ok. I'm looking for a temperature sensor about 15mm length (or less) like a
> PT-100. Cost is my problem. I will purchase about 1k/month. I want (of
> course) a reliable piece but not so accurate as I can adjust its curve by
> software.
>
> Thanx,
>
> Marcelo Y.
> m_yamamotospamspam_OUTuol.com.br

There is a misconcept here about adjust all curves by software. I am not
saying you are wrong, in true this is the way to go, I do it too, but
the tricky thing here is not the accuracy, but the "repeatability".  If
the component curve is a pure zig-zag around what it should be but it is
steady and repeats itself all the way, then using software you can turn
a very cheap component into a high accurate and expensive one.  But
normaly low cost and low accuracy components also have poor
repeatability and lots of noise.

An easy way to test the component repeatability, is just take a
component (ambient temperature) imerse it in 0¡C (water and lots of
ice), wait 2 minutes, measure its output, then imerse it in boilling
water (100¡C) during 2 minutes (enjoy and boil two eggs along :), then
take it back to the iced water... wait 3 minutes and measure its output
again... you will see a diference, this delta is the component
repeatability factor...  Do it 10 times, you will see different values.

Hey Marcelo, o Ciro Ramos ganha? :)

Wagner

1999\10\14@204546 by Reginald Neale

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>
>Ok. I'm looking for a temperature sensor about 15mm length (or less) like a
>PT-100. Cost is my problem. I will purchase about 1k/month. I want (of
>course) a reliable piece but not so accurate as I can adjust its curve by
>software.
>

Hayashi Denko makes a Pt100 sensor about 3x7x1mm. It's a ceramic chip with
a film coating and wire leads. Model 2005 comes in a relaxed tolerance
class that is less expensive than the standard model. As Wagner noted,
precision may be more important than accuracy in your application. I think
their US distributor is CRZ, but no way to know who it would be in Brazil.

Reg Neale

1999\10\18@153147 by Lawrence Lile

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Try a glass  encapsulated thermistor.  They are cheap (less than US+ACQ-0.25 in
large quantity), reasonable accurate, and horribly nonlinear (which you can
fix with a lookup table.

Fenwall electronics   (US) 508-478-6000  sorry, no web page known

{Original Message removed}

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