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Insulated Thermocouples |
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Fluororesin Insulated Thermocouples |
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Fluororesin Insulated extreme thin thermocouple Fineflex ® |
Fluororesin Insulated thermocouples are duplex thermocouples that are useful with excellent flexibility and with simple anatomy. Insulated thermocouples are covered insulation with Fluororesin on thermocouple bare wire guaranteed with accuracy of measurement.
We will immediately deliver orders for Fluororesin Insulated thermocouples as we always keep them in stock.
Please appoint the processing method for Fluororesin Insulated thermocouples for the whole length or for terminal parts, at the time of ordering welding the contact points of temperature measurement.
Fluororesin Insulated thermocouples have excellent heat resistance, chemical resistance, electric features, mechanical features, climate resistance, and are non-flammable.
The classifications and conductor standards of Fluororesin Insulated thermocouples
| The classifications | Insulated type | Insulator type | Core wire materials | Linear diameter (mm) |
Heat electromotive force (mV) Standard point of contacting 0˚C | |||
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| + side core | - side core | + side core | - side core | 100˚C | 218˚C | |||
| K | Blue | Red | White | Chronic *1 | Alnich *1 | 1/0.32 1/0.65 |
4.096±0.062 (±1.5˚C) |
8.860±0.060 (±1.5˚C) |
| E | Purple | Red | White | Chronic *1 | Copper-Nickel Alloy | 6.319±0.100 (±1.5˚C) |
14.762±0.110 (±1.5˚C) | |
| J | Yellow | Red | White | Iron | Copper-Nickel Alloy | 5.269±0.080 (±1.5˚C) |
11.778±0.080 (±1.5˚C) | |
| T | Brown | Red | White | Copper | Copper-Nickel Alloy | 4.279±0.023 (±0.5˚C) |
10.254±0.047 (±0.87˚C) | |
*1 Chronic and Alnich are our registration trademarks of Chromel and Almel.
We will introduce the classifications of insulated thermocouples and their features. Please choose with your order.
| K insulated thermocouples | The used temperature ranges used are most diverse from -200˚C ~ 1200˚C, and also, most similar to a straight line as in the relationships of temperatures in-between them and heat electromotive force. These thermocouples are inexpensive on comparison with noble metal thermocouples, and so they are the most diversely used as industrial thermocouples. |
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| E insulated thermocouples | These have the highest heat electromotive force among thermocouple used today, and are the most sensible thermocouples. E insulated thermocouples are 50 % higher on a comparison with K insulated thermocouple, and are 20 % higher on comparison with J insulated thermocouples in heat electromotive force. Therefore, they are used within a temperature range below 700˚C to 800˚C. |
| J insulated thermocouples | These are usually used for temperature measurement under 600˚C. They have the second best sensibility next to E insulated thermocouples, and on comparison with E insulated thermocouples, they are more inexpensive in value. Furthermore, J insulated thermocouples have strength sufficient for use at reduced atmosphere. |
| T insulated thermocouples | These are usually used for temperature measurement under 300˚C. Since they have high accuracy and the excellent process ability for drawing, they are widely used as highly accurate insulated thermocouples for low temperature, and are processed on glass fiber or Fluororesin insulation. These thermocouples are also widely used as insulated thermocouples for extremely low temperature. |
* Our standard Fluororesin Insulated thermocouple products are different from the ones for usual temperatures listed above due to thin wire diameters of 0.32 and 0.65 (refer to graph-4).
| Insulated thermocouple electromotive force graph |
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| Graph-2 |
The classifications and lengths of insulated thermocouples
| No. | Standard products | Formal symbols | Bare wire diameter (mm) |
Standard matching length (mm) |
Insulation, Protection insulation | |
|---|---|---|---|---|---|---|
| Materials | Highest temperature used for insulation (˚C) | |||||
| 1 |  |
K-0.4=FEPFEPF | 1/0.32 1/0.65 |
1.0×1.6 1.5×2.4 |
Fluororesin | 200 |
| 2 |  |
K-0.4=FEPFEP | 1/0.32 1/0.65 |
1.6 2.4 |
Fluororesin | 200 |
| 3 |  |
E-0.4=FEPFEPF | 1/0.32 1/0.65 |
1.0×1.6 1.5×2.4 |
Fluororesin | 200 |
| 4 |  |
J-0.4=FEPFEPF | 1/0.32 1/0.65 |
1.0×1.6 1.5×2.4 |
Fluororesin | 200 |
| 5 |  |
T-0.4=FEPFEPF | 1/0.32 1/0.65 |
1.0×1.6 1.5×2.4 |
Fluororesin | 200 |
The features of Fluororesin (FEP) insulation
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1) In organic insulation materials, FEP insulation has the highest heat-resistant. FEP is capable of being sequentially used up to 200˚C. |
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2) FEP insulation has excellent cold resistance. FEP is resistant to extremely low temperatures |
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3) This insulation has excellent chemical resistance. FEP is not affected by most chemical products. |
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4) FEP insulation has excellent electric features. It has high resistant capability and high resistance to insulation. (refer to graph-10) |
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5) In regards to mechanical features, FEP insulation has excellent flexibility. In a comparison with PVC, it has strength of flexibility, and can easily be handled. |
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6) It has excellent resistance to climate. As FEP does not absorb light, it does not corrode by light. And furthermore, it is resistant to ozone, high-temperature, and extreme low temperature, and also it does not absorb humidity. Therefore, it does not change due to exposure to the outside for long periods of time. |
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7) FEP insulation is nonflammable. It does not flame as it gets closer to wax. It is nonflammable, and has the least percentage of smoke occurrence. The limited index of oxygen, which is the density for continuation of flame, is 95 vol%. (refer to Graph-9) |
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Features of Fluororesin
1. The classifications of Fluororesin Insulators
| PFA | Demonstrates excellent features that are capable of wide temperature ranges from extremely low temperature to high temperature. |
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| FEP | Has excellent features such as being cold-resistant, chemical-resistant, climate-resistant, adhesive-resistant, and dielectric, however, the heat-resistant temperature is a little low (200˚C for continuous usage). FEP is most widely used as Fluororesin Insulated material. |
| ETFE | As the heat-resistant temperature at continuous usage is 150˚C, ETFE belongs to the middle rank of Fluororesin for heat resistance, however it has a good balance of mechanical strength, chemical resistance, and electrical features. |
2. Chemical resistance and mechanical features
| Heat-resistant(˚C) | electrical features | flammable-resistant(%) | mechanical features | low-friction | chemical-resistant | non-adhesive | climate-resistant | transparency | formality | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| oxygen | alkali | solvent | ||||||||||
| PFA | 260 |  |
95 |  |
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| FEP | 200 | |
95 | |
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| ETFE | 150 | |
30 | |
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| Polyvinyl chloride | 60 | |
45 | |
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◎:Highly-excellent ○:excellent △:available on usage ×:unavailable on usage
| Feature | item | unit | ASTM test method | TFE | PFA | FEP | ETFE |
|---|---|---|---|---|---|---|---|
| Physical feature | melting point | ˚C | --- | 327 | 310 | 270 | 270 |
| specific gravity | --- | D792 | 2.14-2.20 | 2.12-2.17 | 2.12-2.17 | 1.7 | |
| Mechanical feature | Strength to pull | kgf/cm2 | D638 | 140-350 | 280-300 | 190-220 | 410-470 |
| rate of growth | % | D638 | 200-400 | 280-300 | 250-330 | 420-440 | |
| compressibility | kgf/cm2 | D695 | 50-60 | --- | 50-60 | 109 | |
| impact | kgfcm/cm | D256A | 16.3 | --- | non-destructive | ||
| hardness | Shore hardness | D2240 | D50-65 | D60 | D55 | D75 | |
| bending modulus of elasticity | 103kgf/cm2 | D790 | 5.0-6.0 | 6.6-7.0 | 5.5-6.5 | 9.0-14.0 | |
| Heat-resistant feature | wire swell index | 10-5/˚C | D696 | 10 | 12 (+20 ~ +100˚C) |
8.3-10.5 (+20 ~ +100˚C) |
5.9 |
| Temperature of heat transformation 18.5kgf/cm2 |
˚C | D648 | 55 | 47 | 50 | 74 | |
| Temperature of heat transformation 4.6kgf/cm2 |
˚C | D648 | 121 | 74 | 72 | 104 | |
| maximum temperature for usage (continuous) |
˚C | (no load) | 260 | 260 | 200 | 150 | |
| Electric features | volume resistant | Ω-cm | D257 (50%RH.23˚C) |
＞1018 | ＞1018 | ＞1018 | ＞1018 |
| insulator destructive strength | ｋV/0.1mm (0.25mmt) |
D149 | 6-10 | ＞10 | ＞10 | ||
| dielectric | (106Hz) | D150 | ＜2.1 | ＜2.1 | 2.1 | 2.6 | |
| dielectric tangent | (106Hz) | D150 | ＜0.0002 | ＜0.0003 | ＜0.0005 | ＜0.0005 | |
| resistant-arc | sec | D495 | ＞300 | ＞300 | ＞300 | 75 | |
| Miscellaneous | chemical-resistant | D543 | Excellent | Excellent | Excellent | Excellent | |
| absorbent | % | D570 | ＜0.00 | ＜0.01 | ＜0.01 | ＜0.1 | |
| Liquid | TFE | FEP |
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| Benzene | |
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| Gasoline | |
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| Four Carbon | |
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| Carbon disulfide | |
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| Chloroform | |
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| Ethyl alcohol | |
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| Petroleum ether | |
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| Nitric acid(10%) | |
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| Sulfuric acid(10%) | |
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| Hydrochloric acid(10%) | |
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| B Heavy oil | |
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| DOP | |
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| Transformer oil | |
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| Cresol | |
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◎:Excellent