Compensating lead types strictly match thermocouple types, categorized according to their index number. The main classifications and applicable scenarios are as follows:
1. Most commonly used compensating lead types for hot runner systems
|
Compensating Lead Type |
Compatible Thermocouple Index Number |
Insulation Material (selected according to ambient temperature) |
Applicable Scenarios |
|
KX |
K-type thermocouple (most commonly used in hot runners) |
PVC (70℃ resistant) / Fluoroplastics (200℃ resistant) |
Most conventional and high-temperature hot runner injection molding systems |
|
JX |
J-type thermocouple |
PVC (70℃ resistant) / Fluoroplastics (200℃ resistant) |
Compatible with some imported European and American hot runner systems |
Suffix Explanation: "X" indicates an extension-type compensating lead, with thermoelectric characteristics completely identical to the thermocouple, offering the highest accuracy and being the first choice for industrial hot runners; "C" indicates a compensating type, with slightly lower accuracy, generally not used in hot runner scenarios.
2. Compensation Models Corresponding to Other Less Common Grading Numbers
These are rarely used in hot runner systems, but will be used with special thermocouples:
TX: Compatible with Type T thermocouples, used in low-temperature injection molding scenarios
EX: Compatible with Type E thermocouples, used in low-power temperature measurement scenarios
NX: Compatible with Type N thermocouples, used in scenarios requiring high-temperature oxidation resistance
3. Classification by Accuracy Grade and Structure
Accuracy Grade: Divided into standard grade (tolerance ≤2℃) and precision grade (tolerance ≤1℃). For precision injection molding of hot runner systems, precision grade is recommended for smaller errors.
Structure Type: Divided into shielded and unshielded types. Since the hot runner is close to the heating coil and injection motor, a shielded compensation lead must be selected to avoid electromagnetic interference causing temperature jumps.
