OK to control PTC heaters using PID?

[Marc Lee]

Is it a good idea to control 220V PTC heaters heaters using PID (via an SSR obviously).
E.g. like these ceramic PTC heaters:
https://www.aliexpress.com/store/group/220V/508447_257834596.html?spm=2114.8147860.0.0.KQn4nw
or these:
https://www.aliexpress.com/store/group/220V/508447_258832837.html

[dc42]

I can't see any reason not to. RRF uses low frequency (10Hz) PID on the bed and chamber heaters so as to be compatible with all types of SSR.

[Marc Lee]

Thanks dc42. Is anyone else using PTC heaters for the bed and/or enclosure? Becasue the maximum temperature of PTC heaters is inherent in their construction, it seems this makes them safer than other heater options that rely on additional temperature sensors to stop thermal runaway. Is this correct logic?

[dc42]

@Marc:

Thanks dc42. Is anyone else using PTC heaters for the bed and/or enclosure? Becasue the maximum temperature of PTC heaters is inherent in their construction, it seems this makes them safer than other heater options that rely on additional temperature sensors to stop thermal runaway. Is this correct logic?

I think that is good logic, provided that the heater can still reach the temperature you need in a reasonable time.