Kapton Type T Extension Cable PFA Tape Backaed ANSI Standard Color
Small Diameter
TYPE T (Copper vs Constantan) is used or service in oxidizing, inert or reducing atmospheres or
in vacuum. It is highly resistant to corrosion from atmospheric
moisture and condensation and exhibits high stability at low
temperatures. It is the only type with limits of error guaranteed
for cryogenic temperatures.
1. Chemical Composition
| Material | Chemical composition (%) |
| Ni | Cu | Si | Iron | Al |
| TP(Copper) | | 100 | | | |
| TN(Constantan) | 45 | 55 | | | |
2. Physical Properties and Mechnical Properties
Material |
Density(g/cm3) |
Melting point(℃) |
Tensile Strength(Mpa) |
Volume resistivity(μΩ.cm) |
Elongation rate (%) |
| TP(Copper) | 8.9 | 1084 | >196 | 1.71(20℃) | >30 |
| TN(Constantan) | 8.8 | 1220 | >390 | 49.0(20℃) | >25 |
Thermocouple Cable Grade
A: Extension Grade Cable
Whose wire composition is totally as the same as the thermocouple
wire, remarked by the letter“X”after the thermocouple symbol
number, such as“KX”“JX”“TX”
B: Compensation Grade Cable
Whose wire composition is different from the thermocouple wire, but
its wire electromotive force (EMF) value is the same as
thermocouple wire only at 0-100℃ or 0-200℃. It remarked by the
letter“C”after the thermocouple symbol number, such as“KC”“JC”“TC”
Performance | Extension Grade | Compensation Grade |
Material | Same as thermocouple | Different from thermocouple |
| EMF Value Feature | Same as the thermocouple’s at certain temperature range | Same as the thermocouple’s |
| Deviation Curve | Nonlinear, varies with temperature | Linear |
| Working Temperature Range | Limited(usual at 100℃) | Unlimited(depend on insulation material temperature bearing) |
| Line Resistance | Low resistance | High resistance |
| Compensation Contact Interference | Different contactor material may cause interference | None |
Accuracy | Low | High |
Price | Low | High(about 1-2 times higher) |
For the extension/compensation cable, the basic structure is
conductor and insulation.
To increase its temperature bearing ability and to install easily,
jacket is applicable.
In the working environment, there are too much factors will
interference the EMF signal, therefore shield layer is practical
way to prevent the cable from interference caused by complex
environment.
ReF. The Short Name for Materials
| Type | Insulation material | CODE | Inner Shielding | CODE | JACKET | CODE |
| K | FEP | FP | | | FEP | FP |
| T | PFA | FA | Al foil | AL | PFA | FA |
| E | PVC 70℃ | LP | copper wire | CU | PVC 70℃ | LP |
| J | PVC 105℃ | HP | Tinned copper | TC | PVC 105℃ | HP |
| N | Fiberglass 400℃ | BL | Nickel plated copper | NC | Fiberglass 400℃ | BL |
| SC | Fiberglass600℃ | BM | Silver plated copper | AC | Fiberglass600℃ | BM |
| | Fiberglass700℃ | BH | | | Fiberglass700℃ | BH |
| | MICA FIBER 650℃ | MA | | | | |
| KCA | Vitreous Silica 800℃ | VS | SS 304 wire | SS | Vitreous Silica 800℃ | VS |
| KCB | Silica fiber1000℃ | SV | Inconel 600 wire | 600 | Silica fiber1000℃ | SV |
| RTD | Ceramic fiber1200℃ | CF | Inconel 625 wire | 625 | Ceramic fiber1200℃ | CF |
| | PTFE | PT | | | PTFE | PT |
| | ETFE | ET | | | ETFE | ET |
| | KAPTON | KP | | | KAPTON | KP |
| | Silicone rubber | SR | | | Silicone rubber | SR |
| | Rubber | RU | | | Rubber | RU |
| | PE | PE | | | PE | PE |
