In general, we recommend to control the temperature by a thermometer in the cell (Tc – see image below from manual). However, this comes with a safety risk. I.e., if there for some reason is no flow in the circuit, Tc will remain constant while the heater increases power and the heating unit can reach very high temperature and cause damage/leaks. For this reason we STRONGLY recommend to have an additional thermometer (Th) in the heating unit. This thermometer can be used in a safety circuit that turns of the heater if the temperature increases above a certain safety value e.g. 130C (or whatever value is being considered safe). There are many PID controllers that have this additional built in safety feature/temperature measurement option. Sensorshop24.de also have
PID controllers, however, it is uncertain if any of the controllers also have a ‘safety feature/loop’ option. From the specs, at least the ‘high-end’ version (about 200 EUR) has that (but please check yourself).
