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    Thermocouple, K type, Sheath

    Sheath thermocouple have shielded thermocouple wire of common length 500mm and sheath diameter Ф3~Φ8mm, with flexibility, high pressure resistant, fast thermal response time and long operating life. K type thermocouple can directly measure the temperature of liquid, vapor, gas medium and solid surface in the range of 0~950 ℃ in various production processes.
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    Delivery date: 6-12 days

    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.

    1. S/E/K/J/T type thermocouple temperature range and accuracy chart

    Category Type of sensing element Sheath diameter Normal working temperature Highest working temperature Allowable deviation Δt
    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

    2. 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 8.0

    3. Thermocouple wire structure chart
    Thermocouple wire structure chart
    4. Selection chart

    Sheath diameter Branch number Installing form Mode of connection Working end form Multipoint type Additional device
    D3: Φ3;
    D4: Φ4;
    D5: Φ5;
    D6: Φ6;
    D8: Φ8
    B1: Single branch;
    B2: Double branch
    I1: No fixed device;
    I2: Fixed card sets of thread joint;
    I3: Movable card sets of thread joint;
    I4: Fixed card sets of flange;
    I5: Movable card sets of flange
    C0: Simple terminals;
    C3: Standard waterproof protection head;
    C4: Explosion-proof protection head;
    C5: Standard plug;
    C6: Aviation plug;
    C7: Handheld;
    C8: Small waterproof protection head;
    C9: Direct lead wire
    W1: Insulation type;
    W2: Shell type;
    W3: Open end type
    M3: 3 points;
    M4: 4 points;
    M5: 5 points;
    M6: 6 points
    S: Sanitary chuck;
    H: Heat collector

    5. Thermocouple installation diagram
    Thermocouple installation diagram
    Tips: Advantages of sheath thermocouple
    Sheath thermocouple is a solid integrity which is formulated by thermocouple wire, insulating material and metal sheath through stretching or rotary swaging. The diameter of sheath thermocouple can be processed small and long.

    1. Thermal inertia or thermal response time of thermocouple is short. It has significant importance to modern industrial production process that adopts computer to detect and control.
    2. It saves materials, especially precious metal, thus reducing cost.
    3. Thermocouple has great flexibility, thus it can be applied to measure temperature of industrial production equipment with complex structure.
    4. Long service life
    5. Sheath thermocouple has favorable mechanical property, thus it can resist strong vibration and impact. It can be suitable for temperature measurement of production equipment with vibration and impact.
    6. It has high pressure resistant and has favorable insulation in high temperature. Thus it is suitable for temperature measurement of equipment in industrial production process with high temperature or high pressure or both.
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