Thermocouple Cable & Compensating Cable
Thermocouple Cable & Compensating Cable
'Rolycab' and 'NILSON' Make
In process plants and other industries it is impracticable and many a times impossible to have a cold junction at the end of thermocouple. It is therefore desirable to extend the couple to a reference point some considerable distance away. This can be achieved by the use of thermocouple extension or compensating cable.
Thermocouple extension wires and compensating cables have identical characteristics to their basic thermocouples in the restricted temperature span as is recommended in ANSI MC 96.1 with this range of cables the element conductors can be extended to a position where a stable temperature is maintained, transferring the effective cold junction to the remote end of the extension or compensating cable.
Certified by
Specification
- Conductor:
- 16 Awg(1.29mm) standard for 1-pair and 20Awg (0.81mm) for multipair cables. Conductors such as 1.381 (1.5 mm2) or 18Awg (1.02) or stranded 7 * 0.3 (0.5mm2) also available on request. Matched homogenous wire materials are used to obtain best results.
- Insulation:
- Primarily insulation of extruded PVC, 85oC grade or 105oC grade is standard. Insulation such as LDPE, Fiber glass or asbestos braid is available as optional.
- Pair:
- Insulated pair is twisted with a lay of 65 to 75mm.
- Shield
- Twisted pair or pair bundle is taped with Al-Mylar tape with 25% overlap, 100% shield, with 7 * 0.3mm dia, tinned copper wire in continuous contact, with AI side of tape. Cables with each pair shielded and overall pair bundle shielded also available.
- Intermediate Sheath
- Shielded pair or pair bundle is provided with soft extruded PVC, 85oC (105oC) grade.
- Armor
- Served, Annealed GI wire armor.
- Jacked
- Extruded PVC, 85oC or 105oC grade
- Telephone Pair
- Cables with six or more pairs are provided with, 2 Nos. * 20Awg solid conductors PVC insulated
- Cable Characteristics
- Cable with low L/R ratio, critical Capacitance and inductance values are designed to suit customer needs; to meet stringent requirement of secondary instrumentation.
Maximum Inductance
| Cable Type | Conductor Material | Max Inductance Micro H/Mtrs | ||
| +ve | -ve | |||
| KX | Ni Cr | Ni Al | Extension Cable | 4.00 |
| WX | Fe | Cu Ni | Compensating Cable | 8.00 |
| VX(KXA) | Cu | Constantan | Compensating Cable | 1.20 |
| JX | Fe | Constantan | Extension Cable | 8.00 |
| TX | Cu | Constantan | Extension Cable | 1.20 |
| SX | Cu | Cu Ni | Compensating Cable | 1.20 |
| EX | Ni Cr | Constantan | Extension Cable | 4.00 |
| NX | Ni Cr | Cu Ni | Extension Cable | 4.00 |
| 1.00 | ||||
Loop Resistance Thermocouple Extension/Compensating Cables
| Conductor Detail | Loop Resistance(ohms/mtr)+10%@20°C Cable Type | ||||||||
| AWG | Dia(mm) | Cross Sec.Area sqmm | KX | VX KX (A) | JX | TX | SX/RX | EX | XK |
| 16 | 1.29 | 1.31 | 0.76 | 0.39 | 0.46 | 0.39 | 0.104 | 0.97 | 0.97 |
| 18 | 1.02 | 0.823 | 1.21 | 0.62 | 0.76 | 0.62 | 0.169 | 1.52 | 1.52 |
| 20 | 0.81 | 0.50 | 1.98 | 0.97 | 1.20 | 0.97 | 0.266 | 2.50 | 2.50 |
International Color Codes For Thermocouple Cable Insulation
| Conductor Detail | Loop Resistance(ohms/mtr)+10%@20°C Cable Type | ||||||||
| AWG | Dia(mm) | Cross Sec.Area sqmm | KX | VX KX (A) | JX | TX | SX/RX | EX | XK |
| 16 | 1.29 | 1.31 | 0.76 | 0.39 | 0.46 | 0.39 | 0.104 | 0.97 | 0.97 |
| 18 | 1.02 | 0.823 | 1.21 | 0.62 | 0.76 | 0.62 | 0.169 | 1.52 | 1.52 |
| 20 | 0.81 | 0.50 | 1.98 | 0.97 | 1.20 | 0.97 | 0.266 | 2.50 | 2.50 |