Thermometrics TC-21, TC-22, and TC-23 nozzle and melt bolt-style thermocouples are designed for precise temperature measurement of molten plastic in injection molding machines, extrusion dies, hot runner systems, and nozzle manifolds. Threaded bolt-body construction allows direct installation into nozzle or barrel ports.
A bolt-style thermocouple sensor threaded directly into a nozzle or barrel port. The thermocouple junction is located at the bolt tip, measuring temperature at the point of contact. Lead wire exits from the bolt head for connection to the machine controller.
A specialized melt-probe thermocouple designed for direct contact with the molten polymer stream inside an injection nozzle. The tip geometry is matched to the nozzle bore for maximum thermal contact with the melt. Provides melt-stream temperature rather than barrel-wall temperature.
The TC-23 adds a miniature thermocouple connector to the TC-22 lead wire, enabling quick-disconnect replacement in the field without re-wiring the machine controller. Standard ANSI miniature connector, color-coded per type.
| Parameter | TC-21 | TC-22 | TC-23 |
|---|---|---|---|
| TC Type | K, J standard | K, J standard | K, J standard |
| Thread | M6×1 · M8×1.25 · M10×1.5 · M12×1.75 | M6 to M12 — match to nozzle port | M6 to M12 — match to nozzle port |
| Body Length | 15mm to 50mm; custom | 20mm to 60mm; custom | 20mm to 60mm; custom |
| Tip Style | Flat grounded tip | Exposed melt-contact tip | Exposed melt-contact tip |
| Termination | Lead wire, 36" std | Lead wire, 36" std | Mini TC connector + lead wire |
| Body Material | 316SS | 316SS or Inconel 600 | 316SS or Inconel 600 |
| Max Temp | 400°C | 500°C | 500°C |
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