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'[EE]:Measure liquids temperature with 18S20'
2002\08\13@132735 by Claudio Martin

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Hi everybody.

I need to measure temperature on a liquid using a 18s20 sensor from Dallas.
Wich is the best way to do it without contaminating the liquid, and
obtaining an accurate value of temp.. Thanks in advance.

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2002\08\13@133605 by Brendan Moran

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> Hi everybody.
>
> I need to measure temperature on a liquid using a 18s20 sensor from
> Dallas. Wich is the best way to do it without contaminating the
> liquid, and obtaining an accurate value of temp.. Thanks in
> advance.

I'd say go with an IR sensor.

- --Brendan

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2002\08\13@165211 by a?=

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What temperature range do you have to cover ?

       Gabriel.-


-----Mensaje original-----
De: pic microcontroller discussion list
[PICLISTspamKILLspamMITVMA.MIT.EDU]En nombre de Claudio Martin
Enviado el: Martes, 13 de Agosto de 2002 14:26
Para: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
Asunto: [EE]:Measure liquids temperature with 18S20


Hi everybody.

I need to measure temperature on a liquid using a 18s20 sensor from Dallas.
Wich is the best way to do it without contaminating the liquid, and
obtaining an accurate value of temp.. Thanks in advance.

_________________________________________________________________
MSN Photos is the easiest way to share and print your photos:
http://photos.msn.com/support/worldwide.aspx

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2002\08\13@172815 by Spehro Pefhany

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At 05:44 PM 8/13/02 -0300, you wrote:
>What temperature range do you have to cover

And what is the liquid? Human blood? 120'C fuming Nitric acid? Sewage?
Food? A microbial cell culture? The water in a hot tub? (same thing?)

Any kind of sheath is going to slow down the response, and you have to
make sure that any materials that are in contact with the liquid are
compatible with it. Industrially, the most common probe material is
probably 300-series stainless steel tubing, TIG welded, which meets
NSF standards for food contact as well as being resistant to a lot of
common chemicals under normal conditions.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
@spam@speffKILLspamspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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2002\08\15@164653 by John Paul Aguiling

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I would like to know what is the configuration of an IR sensor?



----- Original Message -----
From: "Brendan Moran" <RemoveMEbmoranTakeThisOuTspamMILLENNIUM.CA>
To: <spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU>
Sent: Wednesday, August 14, 2002 1:34 AM
Subject: Re: [EE]:Measure liquids temperature with 18S20


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2002\08\15@165452 by Brendan Moran

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> I would like to know what is the configuration of an IR sensor?

Well, that was a message from a while ago... The problem with an IR
sensor for this application is that you need to know the temperature
of the wine, not the temperature of the surface of the wine.  Now,
that said, you should be able to put it inside some form of clear
plastic tubing that doesn't absord IR, and put that in the wine... As
to configureation/calibration, it could be kinda tough to do...  I'm
not sure what you'd need at this stage.  I defer to someone on the
list with more experience in this area.

- --Brendan

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