temperature sensor

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.

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.

Best regards, Spehro Pefhany

These look easy enough to use:

I haven't used one yet, but I'm planning on using the AD595 (Type K) in a little project I'm thinking about doing.

`Could try for a Thermistor?

----------------------------------------------------------------------- Ashley Clarke

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