Type J PTFE / Teflon Insulated Thermocouple Cable
Type J uses an iron positive leg, so it suits reducing or vacuum atmospheres and the moderate temperatures found in plastics, rubber and packaging machinery. Many older Indian panels and injection-moulding controllers still expect J-type input, which keeps steady demand for matched JX extension cable.
In the Teflon/Teflon construction both cores and the outer sheath are PTFE. PTFE does not absorb water, resists almost all chemicals and oils, and keeps high insulation resistance, so readings stay stable in wet, washdown and corrosive areas.
Our Type J ptfe / teflon cable uses Iron / Constantan (Cu-Ni) conductors in JX extension grade. PTFE insulation, typically −60 to 250°C, moisture and chemical resistant. It follows the Black (+) / White (−), black sheath colour code under IEC 60584-3, with ANSI MC96.1 colours (White (+) / Red (−), black sheath) available for export or imported instruments. Standard sizes are 7/36, 3/26, 3/28, 3/22, 1/24, 1/22, 0.5, 1, 1.5 and 2 sq mm, in single-pair or multi-pair construction.
Accuracy depends on using cable of the same type as the sensor and connecting it with the right polarity. A Type J sensor needs Type J extension or compensating cable all the way to the instrument; copper wire or cable of a different type adds an error wherever the junction is warm. Typical tolerance: JX Class 1 ±1.5°C, Class 2 ±2.5°C (IEC 60584-3).
When ordering Type J ptfe / teflon cable, tell us the conductor size, number of pairs, total length, the colour standard your panel follows and the highest temperature the cable route will see. If only part of the route is hot, we can suggest a hot-zone section in a heat-resistant construction joined to a lower-cost cable for the cool run, which keeps accuracy while reducing cost.
Rewari Cable Industries manufactures this cable at our Rewari factory and supplies it in drums or cut lengths with a Material Test Certificate for each batch, covering conductor resistance, insulation resistance and spark test. Use the thermocouple cable configurator to pick size, insulation and length, or send your drawing on WhatsApp for a quote.
Specifications
| Thermocouple type | Type J |
|---|---|
| Conductor alloys | Iron / Constantan (Cu-Ni) |
| Grade | JX extension grade |
| Insulation system | Teflon / Teflon |
| Temperature rating (cable) | PTFE insulation, typically −60 to 250°C, moisture and chemical resistant |
| Sensor range (reference) | Sensor −40 to 750°C |
| Colour code IEC 60584-3 | Black (+) / White (−), black sheath |
| Colour code ANSI MC96.1 | White (+) / Red (−), black sheath |
| Tolerance (typical) | JX Class 1 ±1.5°C, Class 2 ±2.5°C (IEC 60584-3) |
| Sizes | 7/36, 3/26, 3/28, 3/22, 1/24, 1/22, 0.5, 1, 1.5 and 2 sq mm |
| Construction | Single pair or multi-pair; drums or cut lengths |
| Documents | Batch Material Test Certificate (MTC) |
Typical values. Your TDS and batch MTC are the binding documents.
Typical applications
- Injection-moulding barrels and hot runners
- Rubber and tyre curing presses
- Packaging and sealing machines
- Wet, washdown and chemical areas
Frequently asked questions
What is the colour code of Type J thermocouple cable?
Under IEC 60584-3 (used in India and Europe) it is Black (+) / White (−), black sheath. Under ANSI MC96.1 it is White (+) / Red (−), black sheath. Tell us which standard your instruments follow.
When should I choose PTFE thermocouple cable instead of fiberglass?
Choose PTFE when the cable sees moisture, oil, steam or chemicals as well as heat. Fiberglass is better for higher radiant heat in dry areas.
Can I use K-type or copper cable with a Type J sensor?
No. Only Type J extension or compensating cable keeps the reading correct. Other cable creates an error wherever its terminals are warmer than the instrument.
Do you supply a test certificate?
Yes. Every batch ships with a Material Test Certificate covering conductor resistance, insulation resistance and spark test.