Common Misunderstandings in Daily Use of Hot Runner Thermocouples

Many operators have developed incorrect operating habits and cognitive misconceptions regarding hot runner thermocouples in actual on-site production and maintenance, which not only lower temperature control accuracy but also hasten equipment degradation and subtly raise production costs.

The first common misconception is that improved performance equates to greater temperature resistance. Regardless of real molding requirements, many buyers heedlessly pursue thermocouples that can withstand extremely high temperatures. In actuality, items with temperatures too high typically respond more slowly and cost more. Demands can be satisfied by selecting models that match the real plastic melting temperature; excessive performance surplus results in needless waste.

The second false belief is that thermocouples can be utilized until they completely fail. The majority of factories ignore slow performance drift and precision decline in the early aging phase and only replace thermocouples when they fully malfunction. Long-term usage of drifting products will increase the faulty rate over time, and the hidden loss is significantly higher than the cost of routine replacement.

Thirdly, mixed use of various types and haphazard wiring are highly prevalent. For ease of wiring, some employees connect K-type and J-type thermocouples at random or casually flip the positive and negative poles. In severe situations, these activities result in disordered heating logic, erratic temperature feedback, and quickly burned-out temperature control modules.

Fourth, regular calibration and everyday cleaning are frequently neglected. Operators never perform temperature comparison calibration or remove carbon deposits on probe surfaces; instead, they merely pay attention to manufacturing progress. Temperature control is always imprecise due to severe heat insulation and temperature lag caused by thick dirt.

Furthermore, it is a common misconception that loose installation has little effect. When installing thermocouples, many individuals fail to secure them firmly. Under high temperatures and vibration, small gaps will progressively widen, leading to unreliable signals and poor heat conduction. Thermocouples can be completely utilized and have their service life effectively extended with proper use principles and standardized operation.