I am trying to revive a laboratory infrared blackbody cavity. It is essentially a small electric oven that uses a controller to set the oven (cavity)
temperature and maintain it at the set temperature.
The cavity (oven) part has two temperature sensors embedded in it, one is a Type S themocouple and the other a platinum resistance device.
The PRT device is a 3 wire type and reads less than 100 ohms at room temperature. Does a PRT change over time? This device is probably about 25
years old. Can I use an external resistor to 'trim' the resistance up so that when I connect it to a RTD controller it actually gets the temperature
correct?
The S type thermocouple ends at a type S plug on the outside of the blackbody cavity. This was so you could connect it to an 'ice bath' reference
probe and get a better reading of the cavity temperature. I would like to connect this S type thermocouple to a PID controller that accepts an S type
input. What type of wire do I run from the S plug on the side of the oven-cavity to a PID controller input?
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