Type R Twisted Fiberglass Core Insulated Compensating Cable
Type R is a platinum–rhodium thermocouple used where base-metal types age too quickly, such as glass melters, steel ladles and kiln burning zones. Platinum wire is far too expensive to run back to the panel, so a copper-based compensating cable carries the signal instead.
In the twisted-core construction the two fiberglass-insulated legs are twisted together without an overall braid. Twisting reduces induced electrical noise, keeps the cable flexible and lets each leg be separated easily at the terminal block.
Our Type R twisted fiberglass core cable uses Copper / Copper-Nickel compensating alloy conductors in RCA / RCB compensating grade. Fiberglass insulated cores, typically up to 250°C. It follows the Orange (+) / White (−), orange sheath colour code under IEC 60584-3, with ANSI MC96.1 colours (Black (+) / Red (−), green 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 R sensor needs Type R 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: Class 2 ±2.5°C (IEC 60584-3, 0–100°C at the junction).
When ordering Type R twisted fiberglass core 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 R |
|---|---|
| Conductor alloys | Copper / Copper-Nickel compensating alloy |
| Grade | RCA / RCB compensating grade |
| Insulation system | Twisted Fiber Cores |
| Temperature rating (cable) | Fiberglass insulated cores, typically up to 250°C |
| Sensor range (reference) | Platinum sensor 0 to 1,600°C |
| Colour code IEC 60584-3 | Orange (+) / White (−), orange sheath |
| Colour code ANSI MC96.1 | Black (+) / Red (−), green sheath |
| Tolerance (typical) | Class 2 ±2.5°C (IEC 60584-3, 0–100°C at the junction) |
| 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
- Glass tank furnaces and forehearths
- Steel ladle and tundish measurement
- Cement kiln burning zone
- Hot zones near furnace and boiler walls
Frequently asked questions
What is the colour code of Type R thermocouple cable?
Under IEC 60584-3 (used in India and Europe) it is Orange (+) / White (−), orange sheath. Under ANSI MC96.1 it is Black (+) / Red (−), green sheath. Tell us which standard your instruments follow.
Why twist the cores of thermocouple cable?
Twisting the two legs cancels much of the noise picked up from nearby power cables and motors, which gives a steadier reading at the instrument.
Can I use K-type or copper cable with a Type R sensor?
No. Only Type R 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.