Question about measuring Temperature
Peter L. Peres email (remove spam text)
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.
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