How To Distinguish Genuine And Counterfeit Hot Runner Thermocouples By Appearance

The market is flooded with counterfeit copycat hot runner thermocouples, which look similar to the real products, but the interior materials and performance are very different. Maintenance personnel can quickly distinguish genuine and counterfeit products without professional testing instruments by appearance details, process texture, welding marks, sheath finish and wire workmanship, so as to avoid being misled by low-cost counterfeit products and bring hidden troubles to hot runner temperature control.

First note the surface of the metal sheath. Genuine thermocouples are using the precision seamless tube drawing method, having a flawless mirror finish, consistent colour, without burrs, without pitting without scratch marks. Counterfeit products, common welded pipe, poor finishing, rough surface, dull colour, drawing lines and tiny rust spots.

Second, verify the position of the probe weld. Real integrated goods, seamless laser welding at bending position and connection point, smooth transition, no welding scar and bulge. Counterfeit items apply manual argon welding, apparent welding tumours, unequal solder joints and rough edge burrs, easy to loose and shatter after long time vibration.

Third, learn the texture of lead insulation. True leads have consistent colour, fine and compact surface, good hardness and no unique smell. The counterfeit leads have irregular colour, rough surface, brittle texture, harsh plastic smell and are easy to harden and shatter at high temperature.

Fourth, compare size tolerance and mark. Real items have accurate tolerances for length and diameter and clear laser marking for the model and batch that does not fade easily. Counterfeit products contain huge size errors, hazy screen-printed markings that easily slide off. If you master these basic appearance identification methods, you can swiftly screen out counterfeit items, assure the use of real authorised thermocouples, and eliminate quality and safety hidden threats from the source.