Could mod ina210 breakout to read pt100 temp sensor?

Discussion in 'Analog & Mixed-Signal Design' started by fouad belkhadem, Dec 5, 2018 at 12:47 PM.

  1. fouad belkhadem

    Thread Starter New Member

    Jun 28, 2018
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    0
    Hi to all,

    Actually working on project to replace air compressor controller board with aduino.

    Need to read pt100 temp sensor range 0-130° ,a i know signal must amplified,so my question is there any way to mod ina219 breskout board to read this sensor?

    Thankd
     
  2. bertus

    Administrator

    Apr 5, 2008
    18,682
    3,633
    Hello,

    When you want to measure the temperature between 0 and 130 °C, the resistance of the PT100 will change from 100 to about 150 Ohms.
    To convert the resistance to a voltage, a constant current source could be used.
    Keep in mind that putting a current may lead to self heating.

    Bertus
     
  3. fouad belkhadem

    Thread Starter New Member

    Jun 28, 2018
    7
    0
    Thanks for replay,i mean that ina219 it self is a op amp,so modifiying the component may help to read pt100 sensor.
     
  4. bertus

    Administrator

    Apr 5, 2008
    18,682
    3,633
    Hello,

    As said, a constant current source can convert the resistance into a voltage.
    When you connect a constant current source between V+ and the power supply and put V- to ground and replace the shunt resistor with the PT100, you should be able to read the voltage with the INA.
    A constant current source of 1 mA would give you voltage range of 100 to 150 mV.

    Bertus
     
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