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'Question about measuring Temperature'
1998\11\17@135225 by Brian Hammill

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Check out the temperature measurement devices offered by Dallas Semiconductor http://www.dalsemi.com

Look under thermal management products.

Their devices use either 1, 2, or 3 wires for communication and can interface to a microcontroller such as a PIC or can interface to a PC serial port using their adapter.  They show how to build the adapter in the application notes section.  The 1-wire parts can be multi-dropped on a single bus.  Other 1-wire parts are available that can sense voltage, logic levels, and provide EEPROM data storage.

Dallas also offers an evaluation kit that includes the RS-232 serial port adapter.

Good Luck,
Brian

Brian Hammill -  Sr. Software Design Engineer
Network Systems -  Connectivity Products
Exide Electronics (919)878-6058
//spam_OUThammillTakeThisOuTspamemail.exide.com
http://www.exide.com

1998\11\18@042647 by Nigel Orr

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At 13:09 17/11/98 -0500, you wrote:
>Check out the temperature measurement devices offered by Dallas
Semiconductor http://www.dalsemi.com
>
>Look under thermal management products.

Does anyone here have any experience in measuring oven temperatures- 140 to
240 deg C?  I fancy putting together a little PIC-based oven thermometer- I
can see that the PIC will have to be outside, but I can't think of suitable
cable/terminations/sensor combinations.  I'm guessing any form of soldering
is out, and crimps are in, and the ideal way would probably be a bimetallic
type thermocouple, but there don't seem to be any in the usual UK sources
(Maplin, Farnell, RS).  Cables seem to be available rated to about 200C,
nothing to 240-  Any advice?  Is this doable?

Nigel

1998\11\18@103822 by John Griessen

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You could use a thermistor in a glass diode package (very inexpensive for
low tolerance part that you calibrate via a calculated lookup table) and
attach your lead wires with silver solder, or phosphorous copper brazing
rod, whichever is easier to find

They cover the 0-300 C range with low drift as they age.
Their zero (spec'd at 25 deg C) does vary +- 10% piece to piece even though
the curve shape is very repeatable.

US Sensor will send you samples of such (like 100K at 25 deg C curve J), and
the prices start at 60 cents and get down to 10 cents.  If you're just
working on a one off project, tell me and I'll mail you two and a copy of
their temp chart and   curve fitting formulas.

Can use glass braided cable form Omega in the US, or some
oven/foundry/crucible/pottery/heating furnace supplier.

John Griessen    CIBOLO Metal Works
http://www.aus-etc.com/~cibolo/


{Original Message removed}

1998\11\18@120617 by Peter L. Peres

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On Wed, 18 Nov 1998, Nigel Orr wrote:

> Does anyone here have any experience in measuring oven temperatures- 140 to
> 240 deg C?  I fancy putting together a little PIC-based oven thermometer- I
> can see that the PIC will have to be outside, but I can't think of suitable
> cable/terminations/sensor combinations.  I'm guessing any form of soldering
> is out, and crimps are in, and the ideal way would probably be a bimetallic

Crimps are out unless it's a professionally chosen combination, they
oxydize inside and the different dilation etc will work them loose within
weeks or months. Look into spot welding.

> type thermocouple, but there don't seem to be any in the usual UK sources
> (Maplin, Farnell, RS).  Cables seem to be available rated to about 200C,
> nothing to 240-  Any advice?  Is this doable?

I think that teflon coax is rated to 400 degrees ?

Instead of a thermocouple, a RTD seems to be in order. I got the idea from
a previous set of messages on the list and have meanwhile played with some
nichrome (?) resistor wire coils in empty ceramic resistor bodies. It
works pretty well.

Peter

1998\11\18@124523 by Michael Hagberg

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check out http://www.omega.com they have many process control devices.

michael

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