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4 February, 16:49

Suppose we include the lead resistance in the calculation of temperature for a class A RTD. If R3 = 1000 ohms, Ra = 18 ohms, V0 = 1.80 volts, and V = 5 volts. Including the tolerances, what is the highest temperature you could measure in °C? (Type in a two-decimal number)

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  1. 4 February, 19:12
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    The highest temperature that could be measured (in °C) is 14170.27°C

    Explanation:

    RTDs are thermometers consist metals of which it resistance increase with temperature.

    For Class A RTD l, Alpha = 0.00385.

    The formula for RTD is

    Rt = Ro (1 + alpha x t)

    Where

    Rt is Resistance at temperature t°C,

    Ro is the Resistance at 0°C

    Alpha is a constant temperature coefficient of class A RTD.

    Here, Rt = 1000ohms,

    Ro is taking as Ra = 18Ohms

    Therefore,

    1000 = 18 (1 + 0.00385t)

    Divide both sides by 18

    1 + 0.00385t = 1000/18

    0.00385t = 55.55 - 1

    0.00385t = 54.55

    t = 54.55/0.00385

    t = 14170.27°C
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