Hobby Electronics Basics what type of probe is this? e.g. K-Type e.t.c.

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what type of probe is this? e.g. K-Type e.t.c. jameshanley39@yahoo.co.uk 05-21-08
Posted by jameshanley39@yahoo.co.uk on May 21, 2008, 9:53 pm
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I would like to get a temperature probe like this, from an electronics
place.

How would it be described technically? I know they have specific
names, for the form of the bit at the end. K-Type e.t.c.

Here is a picture (it is measuring a HDD temp)
http://www.overclockersclub.com/reviews/nzxt_sentry/images/12.htm

I am also interested in the same question, regarding this probe.
It is measuring CPU temp
http://www.overclockersclub.com/reviews/nzxt_sentry/images/9.htm

Note- I know there are other ways. Software, IR Temp sensor Gun, to
measure temp of components. But I am interested particularly, in these
temp probes like in the picture. some wires and a thing on the end,
and you tape it to the component and read the temperature.

Thanks.



Posted by BobG on May 21, 2008, 10:23 pm
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You dont need a Type K thermocouple until you get in the 100s of
degrees... like for exhaust temperature but a max6675 thermocouple
preamp lets you read 0-1023 deg c on an SPI interface. An IC like an
LM35 puts out 10mv per degree C, has 3 wires, read with an a/d input.
A maxim DS18B20 reads 16th degrees C on a 2 wire digital bus. There
are Positive Temperature Coefficient and Negative TC thermistors that
are accurate but nonlinear and need the correct bias resistor to
prevent self heating. Read with a/d input. Phew. Lots of choices.

Posted by jameshanley39@yahoo.co.uk on May 21, 2008, 10:47 pm
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> You dont need a Type K thermocouple until you get in the 100s of
> degrees... like for exhaust temperature but a max6675 thermocouple
> preamp lets you read 0-1023 deg c on an SPI interface. An IC like an
> LM35 puts out 10mv per degree C, has 3 wires, read with an a/d input.
> A maxim DS18B20 reads 16th degrees C on a 2 wire digital bus. There
> are Positive Temperature Coefficient and Negative TC thermistors that
> are accurate but nonlinear and need the correct bias resistor to
> prevent self heating. Read with a/d input. Phew. Lots of choices.

Forget I said K-Type Thermoprobe

What is the type of probe that is in that picture, measuring the
temperature of that hard drive?

(As in physically. And as far as temp sensing range is concerned, I
am interested in 0-100C)


Posted by Phil Allison on May 21, 2008, 10:54 pm
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<jameshanley39@yahoo.co.uk
>
> Forget I said K-Type Thermoprobe
>
> What is the type of probe that is in that picture, measuring the
> temperature of that hard drive?
>


** Impossible to tell - that pic is far from clear enough and there is
nothing distinctive about what you can see.

My bet is that it is a simple thermistor or maybe just a diode & not a
"thermocouple" at all.



..... Phil



Posted by jameshanley39@yahoo.co.uk on May 22, 2008, 1:45 am
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> <jameshanle...@yahoo.co.uk
>
>
>
> > Forget I said K-Type Thermoprobe
>
> > What is the type of probe =A0that is in that picture, measuring the
> > temperature of that hard drive?
>
> ** Impossible to tell =A0- =A0that pic is far from clear enough and there =
is
> nothing distinctive about what you can see.
>
> My bet is that it is a simple thermistor or maybe just a diode & not a
> "thermocouple" =A0at all.
>
> ..... =A0Phil

ok..
note- that word thermocouple only slipped accidentally. BobG
mentioned it, and it stuck in my head when writing my post!

I guess the name for the type of ending that probe has, is unknown..
And maybe it isn't even that significant. Maybe a bead type ending
would be fine.

I spoke to a brilliant electronics guy.. he couldn't give me a name
for the shape of the thing at the end of it. I guess a flat U
shape! looks better contact than a bead.

He mentioned to me that a
Thermistor - measures resistance
Thermocouple - measures voltage

and they have tables that show resistance or voltage. compared to
temperature.

It can do 0-100C

I have a bead thermister somewhere.

http://www.maplin.co.uk/module.aspx?ITAG=3DSPEC&ModuleNo=3D2218&doy=3D14m2#s=
pec
maplin number FX21 i think

Apparently, it's non-linear (NTC my electronics friend said) So I
won't bother trying to plot it on a graph myself(like with hot water
and ice). I will use a table/graph it comes with.. The maplin guy sent
me a pdf with that data.

Apparently there are devices with LED screens and wires to a
thermistor.

Digital Multimeters with a bead thermister, or one that plugs in.
Though that is effectively the same.

Though the devices with LED screens and wires to a thermister, would
probably have a chip to convert it to Degrees C.


Since I am measuring temp of a hdd in an enclosure,
I asked my electronics friend (I talked to in a chat - on IRC ) I
asked him if a long wire would cause any problem..
The electronics guy said it was fine and was sure that even a 30cm
thin wire would cause a negligible resistance difference compared to
the error within the thermistor itself. I said wire would be as thin
as the wire that connects PC Speaker to connector to jumper within
computer. He said that's 24AWG he reckoned.

I seem to remember crocodile clips getting bad contact.. And I recall
different contact between wire and legs of thermistor, causing
different resistance.
He said that croc clips would be fine though

Though I will be using < 30cm thin wires.. He confirmed my suggestion
that it's fine to wind them round the legs. and tape them with
insulation tape

So. I guess i'll look back into this..

But may get that device anyway.. then I can test my thermistor usage
skills!
Will test it with a thermometer in water compared to "my thermistor"
in water too.

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