Compensation wires are suitable for electrical connections between various thermocouples with division numbers of S, R, K, E, T, J, and N, and temperature display instruments to improve temperature measurement accuracy.
Compensation wires are classified into extension type and compensation type. According to the tolerance of thermoelectric characteristics, compensation wires are divided into precision grade (symbol S) and ordinary grade (no symbol).
Product standards: Thermocouple compensation wires: GB/T4989-94; Thermocouple compensation cables: Q/320831SQL07-96
Product usage characteristics: Operating temperature: Heat-resistant grade: -65°C to +200°C and -65°C to +260°C; Ordinary grade: -40°C to +70°C and -40°C to +105°C; Minimum bending radius: For compensation wires, it should be no less than 8 times the outer diameter of the wire; For compensation cables, it should be no less than 12 times the outer diameter of the cable when armored, and no less than 6 times the outer diameter when unarmored.
Category Introduction:
KX-FF: Fluoroplastic insulated and sheathed ordinary grade K-type thermocouple compensation wire
KX-FPF: Fluoroplastic insulated and sheathed copper wire braided shielded ordinary grade K-type thermocouple compensation wire
KX-FP1F: Fluoroplastic insulated and sheathed tinned copper wire braided shielded ordinary grade K-type thermocouple compensation wire
Notes:
- For other types of compensation wires such as EX, JX, SC, KC, NC, NX, BC, TX, only the first part of the model number needs to be changed, such as EX-VV, EX-VPV.
- For other types of compensation cables such as EX, SC, KC, NC, NX, BC, TX, JX, only the first part of the model number needs to be changed, such as EX-FF, EX-FPF, etc.
- For copper tape shielded cables, simply change P3 in the model number to P2, such as KX-FP2F, which is a fluoroplastic insulated copper tape wrapped shielded fluoroplastic sheathed ordinary grade K-type thermocouple compensation cable.
- There are also specially made high-temperature compensation cables with polytetrafluoroethylene film and glass fiber composite insulation and sheath, such as: KXHF4
Model Names:
KX-GA-VV: PVC insulated PVC sheathed precision grade K-type thermocouple compensation wire
KX-GA-VVR: PVC insulated PVC sheathed precision grade K-type thermocouple compensation flexible wire
KX-GA-VVP: PVC insulated PVC sheathed copper wire braided shielded precision grade K-type thermocouple compensation wire
Note: The above models only list KX. For others such as SC, KC, EX, BC, TX, JX, only the first part of the model number needs to be changed. Flame-retardant compensation wires have ZR added before the model number. ZR192 refers to imported PFA material. Shielding can use tinned copper wire shielding.
Other Specifications:
- Insulation resistance: When the ambient air temperature is 15-35°C and relative humidity does not exceed 80%, the insulation resistance between the wire cores and between the wire core and the shielding layer of the finished compensation wire.
- Mechanical properties of insulation layer and sheath: Tensile strength of insulation layer and sheath ≥12.5N/m², elongation ≥125%
- Flame retardant properties: According to user requirements, can comply with GB12666-1990A, B, C
The external dimensions and calculated weight of compensation wires and compensation cables
Note: I. Cables with shielding or aluminum-plastic composite tape have slightly larger diameters than cables without shielding layers II. Cables with both individual shielding and overall shielding have slightly larger diameters than cables with only individual shielding III. Cables with only overall shielding have slightly smaller diameters than cables with only individual shielding
Common types of compensation cables are as follows:
| Compensation Wire Model |
Matching Thermocouple Type |
Compensation Wire Name | Insulation Color | Tolerance at 100°C (°C) | Tolerance at 200°C (°C) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Positive | Negative | Positive | Negative | Standard | Precision | Standard | Precision | ||
| SC | S | SPC (Copper) | SNC (Copper-Nickel) | Red | Green | ±5 | ±3 | ±5 | - |
| KC | K | KPC (Nickel) | KNC (Nickel) | Red | Blue | ±2.5 | ±1.5 | - | - |
| KX | K | KPX (Silicon) | KNX (Silicon) | Red | Black | ±2.5 | ±1.5 | ±2.5 | ±1.5 |
| EX | E | EPX (Nickel) | ENX (Copper-Nickel) | Red | Purple | ±2.5 | ±1.5 | ±2.5 | ±1.5 |
| JX | J | JPX (Copper-Nickel) | JNX (Copper-Nickel) | Red | Purple | ±2.5 | ±1.5 | ±2.5 | ±1.5 |
| TX | T | TPX (Copper-Nickel) | TNX (Copper-Nickel) | Red | White | ±1.0 | ±0.5 | ±1.0 | ±0.5 |
Specifications and Delivery Requirements:
| Nominal Cross-section (mm²) | 0.2 | 0.5 | 1 | 1.5 | 2.5 | Corresponding Wire |
|---|---|---|---|---|---|---|
| Single Core Structure (mm) | 1/0.52 | 1/0.80 | 1/1.13 | 1/1.37 | 1/1.76 | Conductor 1×n |
| Multi-core Structure (mm) | 7/0.20 | 7/0.30 | 7/0.43 | 7/0.52 | 19/0.41 | Cable 2–37×n |
The delivery length of compensation wires and compensation cables shall be no less than 100 meters. Short lengths with a minimum allowable length of 20 meters are permitted for delivery, and the quantity of such short lengths shall not exceed 10% of the total delivery length. Delivery of cables in any length is allowed upon mutual agreement between both parties.