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K Type Sheathed Thermocouple
The wires of a K type sheathed thermocouple are insulated and implanted in a high-density ceramic compound, often magnesium oxide, before being covered in a metal sheath, as illustrated below.
The wires of K Type Sheathed Thermocouple are insulated and implanted in a high-density ceramic compound, often magnesium oxide, before being covered in a metal sheath, as illustrated below.
Sheathed thermocouples feature a protective sheath with a diameter of Φ1.5~Φ8 mm that shields the thermocouple wire. They are flexible, resistant to high pressure, have a quick thermal response time, and have a long operational life. In a variety of production processes, K type sheath thermocouples are used extensively because they can directly monitor the temperature of liquids, vapors, gas mediums, and solid surfaces in the 0–950 °C range. As a temperature sensor, thermocouple is usually used with display instruments, recording instruments and signal conditioners. Sheath thermocouple also can be used as a temperature sensing element for assembly thermocouple.
Parameters:
S/E/K/J/T type thermocouple temperature range and accuracy
| Category | Types | Sheath diameter | Normal working temperature | Highest working temperature | Allowable deviation | |
| Measuring range | Permissible deviation | |||||
| Platinum Rhodium 10 – Platinum | S type | ≥Φ3mm | 1100℃ | 1300℃ | 0~1300℃ | ±2.5℃ or ±0.75%t |
| Nickelchromium – Copper nickel | E type | ≥Φ3mm | 600℃ | 700℃ | 0~700℃ | ±2.5℃ or ±0.75%t |
| Nickel chromium – Nickel silicon | K type | ≥Φ3mm | 800℃ | 950℃ | 0~900℃ | ±2.5℃ or ±0.75%t |
| Iron – constantan | J type | ≥Φ3mm | 500℃ | 600℃ | 0~600℃ | Not specified |
| Copper – Copper nickel | T type | ≥Φ3mm | 350℃ | 400℃ | ＜-200℃ | Not specified |
| -40~350℃ | ±1.0℃ or ±0.75%t | |||||
Thermal Response Time Of Thermocouple
| Sheath diameter (mm) | Thermal response time (s) | |
| Shell type | Insulation type | |
| 2.0 | 0.4 | 0.5 |
| 3.0 | 0.6 | 1.2 |
| 4.0 | 0.8 | 2.5 |
| 5.0 | 1.2 | 4.0 |
| 6.0 | 2.0 | 6.0 |
| 8.0 | 4.0 | / |
