Dealing with thermocouples - and building thermocoupls

[Rich M]

Nice one Orin!
Yes I agree! anyone following this thread should take a look. www.analog.com
.
Wish I'd known they were available at that sort of price... I've used the
'big brother' AD594 which is fine but expensive, albeit a better accuracy.
But as most people here probably want this for exhaust gas measurement, a
few degrees here or there is no sweat! The datasheet also has a good
temerature/thermocouple voltage reference chart. The AD594 datasheet is also
worth a read for thermocouple theory and background info.
Practical note - you still need to terminate the thermocouple wires close to
the device to avoid temperature differential between the termination and
cold junction compensator to get maximum accuracy.

Rich.


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Orin
> Sent: 20 June 2000 02:12
> To: diy_efi at diy-efi.org
> Subject: Re: Dealing with thermocouples - and building thermocoupls
>
>
> If you can handle surface mount, you should check out the AD597
> as well.  $5 each in the 8 pin soic version.  Silly price ($18),
> silly packaging (TO100) otherwise.
>
> I've used them and it's worth fiddling with the soic package IMO!
>
> Orin.
>
> > Thanks very much Peter for uploading that for me, anyone interested in a
> > simple (cheap) thermocouple amplifier with cold junction
> compensation, take
> > a look. Hope it helps.
> > Rich.
> >
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