Look at thermocouples such as the J, E, or T type. Google for thermocouples
and you should see lots of info. The J type is used on aircraft piston
engine cylinder heads (called a CHT probe) and you might be able to find a
used one cheap down at the local airport maintenance shop.
Inexpensive is a relative thing.
On 29 Sep 2005 21:31:35 -0700, the renowned firstname.lastname@example.org wrote:
Thermocouple. Type K (Chromel-Alumel) is about perfect, though J is
sometimes used in North America (one of the wires is iron so it's not
immune to corrosion from moisture). They are relatively inexpensive
and very rugged, and can be quite fast-responding.
The output is very low (microvolts per degree), somewhat nonlinear and
also a function of temperature at the 'cold' (non-measurement) end of
the thermocouple, so you need signal conditioning, cold-junction
compensation (another, absolute, temperature sensor) and to be
concerned about galvanic isolation in some cases.
If it's a one-off, you can look at industrial quality signal
conditioners on eBay.
"it's the network..." "The Journey is the reward"
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