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    How to Use Pt100 Sensor with Transmitter?

    The Pt100 temperature sensor is an instrument that converts a temperature variable into a transmittable, standardized output signal. Pt100 is a platinum thermal resistor, and its resistance will change with temperature. 100 after Pt means that its resistance value is 100 ohms at 0°C, and its resistance value is about 138.5 ohms at 100°C. Mainly used for the measurement and control of industrial process temperature parameters. Its working principle is that when the PT100 is at 0 degrees Celsius, its resistance value is 100 ohms, and its resistance value will increase approximately uniformly as the temperature rises. But the relationship between them is not a simple proportional relationship, but should be closer to a parabola.

    However, this resistance is not a standard analog signal, so we need a transmitter to convert the resistance signal into a standard analog signal, and next we will introduce how to use it by choosing the model ATO-RTD-D2W of ATO good quality RTD sensor. 


    Pt100 sensor with transmitter

    Open the protective case and you can see a 4-20mA transmitter installed.

    Step 1: Wiring

    • According to the wiring diagram, connecting the Pt100 sensor to the control instrument.
    • Terminals 4 (yellow wire) and 5 (black) are connected to the sensor "+".
    • Terminals 6 (white) are connected to the sensor.
    • Connecting a humidity sensor to ports 3, 7, and 8.
    • Connecting the power supply to ports 15 and 16.

    Wiring diagram of pt100sensor

    After the power is turned on, the display meter automatically calibrates the sensor, the current Pt100 temperature is 20.4 ℃, and the CH2 shows the current humidity.

    Display of pt100 sensor

    Using a sensor to measure a bucket of water that is being heated, and the temperature of the water is around 52°C.

    Testing temperature of pt100 sensor

    Testing temperature of pt100 sensor

    Testing temperature of pt100 sensor

    Step 2: Testing

    Connecting 24V to the output "+".
    Connecting 0V to the "-" end of the detection instrument.
    The SIG output signal is connected to the + end of the detection instrument.
    The detection instrument detects the 9.86mA output signal.

    Wiring diagram with transmitter

    Throw the sensor into hot water at 48°C, and the output of the transmitter is 11.93mA.

    Testing results of pt100 sensor

    You can watch the video below if you want to see more details of how to use the Pt100 sensor with transmitter.

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