Based on your previous focus on the criteria for judging severely worn temperature sensors in hot runner scenarios and the necessity of immediate replacement, severely worn temperature sensors will exhibit the following typical symptoms:
Physical Appearance Symptoms: Upon disassembly, extensive corrosion and structural cracking of the metal substrate are visible, with the internal thermocouple/platinum resistance temperature sensing element completely exposed, resulting in irreversible structural damage.
Temperature Measurement Performance Symptoms: Measured temperature deviation exceeds 2°C, and accuracy cannot be restored even after multiple calibrations. The signal exhibits irregular fluctuations or even complete interruption, resulting in a complete loss of temperature measurement function.
Operating Condition Synergy Symptoms: The hot runner temperature control system continuously triggers over-temperature and under-temperature alarms. Injection molded parts frequently exhibit batch defects such as insufficient glue and flash, which cannot be improved even after ruling out process issues.
If any of these symptoms occur, the machine must be stopped immediately and a brand new temperature sensor of the same model replaced to avoid more serious equipment failures such as hot runner dry burning.
