Help With Resistance Output Temp. Sensor

Discussion in 'General Electronics Chat' started by cgha20@yahoo.com, Apr 19, 2010.

  1. cgha20@yahoo.com

    Thread Starter Active Member

    Oct 21, 2009
    61
    0
    Gentlemen,

    Could you please help me a bit in coming up with a circuit so I can use the KTY84 temperature sensor. I am a little confused as to how it works. I need for it to give me the temperature up to 210 to 220C. Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    How accurate do you need it to be?

    At 220°C, the error could be as much as +/-10°C, even without figuring in the errors induced by the circuitry.

    If you need accuracy, you'd probably be better off using a thermocouple and an instrumentation amplifier.

    If the large tolerance is acceptable, then you'd need a constant 2mA current source through the KTY84. You'd measure the voltage drop across the sensor to get the temperature.
     
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