@Leftyretro yup I know most of them will not survive the conditions I need them to work in, that's why I posted the question
hoping someone will prove me wrong and point me to part that might work
The project is actually quite simple, I have oven 12x4x4m. The oven is heated via electrical heating elements positioned around the oven. The heating elements are grouped in segments, and each segment can be controlled separately. The job oven is used for require
- no fan can be used (so I cannot use fan to "mix" the air inside the oven)
- equal temperature throughout the oven
At the moment, in smaller oven (4x4x2m) I use temperature to resistance transducers (4 of them) that are positioned in "key" parts of the oven to control 4 heating segments. The transducers are connected to the "control box" via 3mm wire insulated with porcelain "bits".
To control the 12x4x4m oven, I need much more (50 is too much, but I might use the same solution for something else, or some bigger oven, for this one ~20 sensors would do) then 4 sensors and running 40 wires trough the oven ain't pretty/easy/cheap/... not to mention, I need then 40 AD inputs .. (ok, I can use SPI/I2C ADC's as I do not need high readout speed so that can be solved that way)...
In general, I can "automatize" this oven with same technology I'm using for smaller ones, but with 1wire device that can withstand the temperature, I can get much better results