Extra thermistors to monitor chamber
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Frédéric - Thanks that's useful is that device something like that used in storage heaters which latches-off if over-temperature? That's not a bad idea but then it's not going to regulate the temperature it's a safety cutoff.
This is a simple on/off switch, with hysteresis. Yes, it is mostly used as over-temp switch, but you can use it as a power limiter for you heater. Another solution is to limit the heater power with max PWM, but having a real safety is a good idea, in case a FET stay closed.