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    Thermocouple, J type, Assembly

    J type thermocouple assembles with protection head and stainless steel thermowell. Its thermo wire diameter is Ф2.5mm. J type thermocouple can directly measure the temperature of liquid, vapor, gas medium and solid surface in the range of 0~500 ℃ in various production processes, especially in vacuum, oxidation, reduction or inert atmosphere.
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    Delivery date: 6-12 days

    As a temperature sensor, thermocouple assembly is usually used with display instruments, recording instruments and signal conditioners.

    1. Thermocouple temperature range chart

    Category Type of sensing element Relationship between wire diameter and temperature
    Thermo wire diameter (mm) Long-term temperature (℃) Short-tem temperature (℃)
    Platinum Rhodium 30 - Platinum Rhodium 6 B type Φ0.5 1600 1800
    Platinum Rhodium 13 - Platinum R type Φ0.5 1300 1600
    Platinum Rhodium 10 - Platinum S type Φ0.5 1300 1600
    Nickel chromium silicon - Nickel silicon magnesium N type Φ0.3 700 800
    Φ0.5 800 900
    Φ0.8, Φ1.0 900 1000
    Φ1.2, Φ1.6 1000 1100
    Φ2.0, Φ2.5 1100 1200
    Φ3.2 1200 1300
    Nickel chromium - Nickel silicon K type Φ0.3 700 800
    Φ0.5 800 900
    Φ0.8, Φ1.0 900 1000
    Φ1.2, Φ1.6 1000 1100
    Φ2.0, Φ2.5 1100 1200
    Φ3.2 1200 1300
    Nickel chromium - Copper nickel E type Φ0.3 350 450
    Φ0.5 450 550
    Φ0.8, Φ1.0 550 650
    Φ1.2, Φ1.6 650 750
    Φ2.0, Φ2.5 750 900
    Iron - Constantan J type Φ0.3, Φ0.5 300 400
    Φ0.8, Φ1.0 400 500
    Φ1.2, Φ1.6 500 600
    Φ2.0, Φ2.5 600 750
    Copper - Copper nickel T type Φ0.2 150 200
    Φ0.3, Φ0.5 200 250
    Φ1.0 250 300
    Φ1.6 350 400

    2. Thermowell application temperature range chart

    Thermowell material Long-term temperature Short-term temperature
    Corundum CT1 1600 1800
    High alumina CT2 1300 1600
    Nickel base wrought superalloys 3YC52 1300 1350
    Nickel base wrought superalloys GH3039 1250 1320
    Nickel base superalloys GH3030 1200 1250
    Heat resistant stainless steel 2Cr25Ni20 1200 1250
    Silicon carbide 1100 1150
    Stainless steel 316L 900 950
    Stainless steel 1Cr18Ni9Ti 800 900

    3. Thermowell installing form
    Thermocouple thermowell installing form
    4. Selection chart

    Total length of thermowell (L or L*L1) Branch number Thermowell installing form Protection head form Diameter and material of thermowell
    300~2150mm (for I1, I2, I3, I4);
    500*500mm, 750*500mm, 750*750mm (for I5);
    225~450mm (for I6)
    B1: Single branch;
    B2: Double branch
    I0: No thermowell;
    I1: No fixed device;
    I2: Fixing thread;
    I3: Movable flange;
    I4: Fixed flange;
    I5: Rectangular movable flange;
    I6: Taper thermowell and fixing thread
    C1: No protection head;
    C2: All stainless steel protection head;
    C3: Waterproof protection head;
    C4: Explosion-proof protection head
    D0: Φ16mm;
    D1: Φ25mm, double-deck;
    D2: Φ16mm high quality aluminum;
    D3: Φ20mm high quality aluminum

    5. Thermocouple assembly installation diagram
    Thermocouple assembly installation diagram
    Tips: Troubleshooting for thermocouple thermode
    Thermode is a metal conductor. In usage, due to long-term smoking of high temperature and influence of surrounding environmental smell (corrosion, water vapor), it will be aged and deteriorate, and causes changes of the correspondence of thermal electromotive force an temperature of thermode and deviations of temperature-millivolt voltage comparison table, thus giving rise to errors of temperature measurement.
    Or the insertion depth of thermode is not enough. The fault generally happens in new devices or in process of repair of devices. Length of protective casing in installation of thermocouple is not enough, which causes distance in pipeline equipment fail to reach to the center of medium and temperature measurement end of thermocouple fail to reach to the peak of temperature, thus causing the measured temperature lower. If insertion depth of thermocouple is too close to outer wall of pipeline equipment, errors will be much bigger and even losing the significance of measurement. If protective casing is long enough while thermode is not long enough, it can be disposed by finding an enough long one to insert in. If protective casing is not long enough, it cannot be disposed but change after the device stops.

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