I need to control the temperature with high precision, and for this task would be good a temperature controller with pt-100 sensor, something like this one PID Temperature Controller ITC-100. As I see that, it can be very simple: there is an input (pt100 sensor), an output - to the heater element (my heating element needs 12V supply). However, I still have some things which are unclear for me:
- Is it generally supposed that there is a power source for the heater element which I also put in the circuit or usually the temperature controller gives the voltage at the output ? Or is that voltages supposed for the external SSR, not my heater?
- In many sources I have seen circuits with external SSR. However, such temperature controllers already have internal relay. Should it be possible without any problem just wire output to my heater (because in all schemes output goes to the external relays)?
- Wires soldered to the pt sensor shouldn't influence much to the measurement, right?