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    RTD Sensor, Pt100, Thermowell

    Pt100 RTD sensor is a platinum resistor temperature sensor with protection head and stainless steel thermowell, high pressure resistant, fast thermal response time and long operating life. RTD sensor can directly measure the temperature in the range of -200~+420 ℃ in various production processes.
    This product has a minimum quantity of 2
    Free Shipping Worldwide
    Delivery date: 6-12 days

    RTD (resistance temperature detector) sensor can directly connect to secondary instrument by copper conductor, and provide accurate input signal of temperature changes for display instruments, recording instruments, signal conditioners, scanister and computer.


    1. RTD temperature range and accuracy chart

    Type of sensing element Measuring range Allowable deviation Δt
    Pt100 -200~420℃ Class B (-200~800℃) Permissible deviation ±(0.30+0.005|t|)
    Class A (-200~650℃) Permissible deviation ±(0.15+0.002|t|)
    Cu50 -100~150℃ -50~100℃ Permissible deviation ±(0.30+6.0*10-3t)

    Note: t is the actual measuring temperature absolute value of the temperature sensing element.
    2. Thermal response time of RTD sensor

    Type of sheathed sensing element Thermowell material Thermowell diameter (mm) Thermal response time (s)
    Pt100, Pt1000 1Cr18Ni9Ti, 2Cr25Ni20 Ф16 ≤90
    Ф12 ≤30
    Cu50, Cu100 H62, 1Cr18Ni9Ti Ф16 ≤120
    Ф12 ≤120

    3. Thermowell installing form (unit: mm)
    RTD sensor installing form

    4. Selection chart

    Total length of thermowell (L) Branch number Thermowell installing form Protection head form Diameter of thermowell
    300~2150mm (Φ16 for I1, I2, I3, I4);
    225~1150mm (Φ12 for I1, I2, I3, I4);
    225~550mm (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
    C3: Waterproof protection head;
    C4: Explosion-proof protection head
    D0: Φ16mm;
    D1: Φ12mm

    Tips: Pt100 RTD sensor working principle
    Pt100 is a kind of platinum resistance, and also a thermistor of positive temperature coefficient, that is, the resistance value rises with the increase of the temperature. Platinum resistance has high accuracy, suitable for neutral and oxidizing medium. It has good stability and can test a wide temperature range (-200~420℃). The most important thing is that platinum resistance has good linearity, that is, when the temperature changes one degree, the increase of resistance value is basically the same. Pt100 resistance value is 100 ohm at 0℃, 18.52 ohm at -200℃ and 175.86 ohm at 200℃. In addition to Pt100, the most commonly thermistor are Pt1000 (platinum resistance of 1000 ohm at 0℃) and Cu50 (copper resistance of 50 ohm at 0℃).

    In this video, ATO will show you how to connect RTD sensor to temperature controller and how to use RTD sensor to measure water temperature.

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