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    Thermocouple, J 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. J type thermocouple can directly measure the temperature of liquid, vapor, gas medium and solid surface in the range of 0~600 ℃ in various production processes, especially in vacuum, oxidation, reduction or inert atmosphere.
    This product has a minimum quantity of 2
    Free Shipping Worldwide
    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

    Branch number Installing form Mode of connection Working end form Multipoint type Additional device Sheath diameter Sheath length
    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
    D3: Φ3;
    D4: Φ4;
    D5: Φ5;
    D6: Φ6;
    D8: Φ8
    Φ3: 50~15000mm;
    Φ4: 50~10000mm;
    Φ5: 50~4000mm;
    Φ6: 50~2000mm;
    Φ8: 50~1000mm

    5. Thermocouple installation diagram
    Thermocouple installation diagram
    Tips: How to prevent interference for thermocouple?

    1. Isolation
      Isolation method is to hang thermocouple in the air to isolate thermocouple from refractory brick of furnace wall, and thermocouple is also isolated from support by use of insulation object. The method can prevent interference of high temperature electric leakage.
    2. Shielding
      Shielding method is to make extension wire of thermocouple pass through iron tube or other metal shields to isolate. In this way, it can prevent electromagnetic interference and interference of high voltage electric field. When using this method, iron tube and shields should be connected with the ground well and twist the extension wire as well.
    3. Ground connection
      This method has two forms: The first is to connect the reference end of thermocouple with the ground, and second is to connect the measurement end of thermocouple with the ground.
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