Transcription of rtd circuits - kennethkuhn.com
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rtd circuits - kennethkuhn.com
RTD Circuits1by Kenneth A. KuhnMarch 19, 2011, rev. March 28, 2011 IntroductionThe abbreviation, RTD, refers to a resistor that has a predictable increase in resistancewith temperature. There are a variety of interpretations of RTD ResistanceThermometer Device, Resistance Temperature Detector, etc. All refer to the same most common RTD is made of pure Platinum wire and has a resistance of at 0 C. RTDs are known by their resistance at 0 C. At lower temperatures thechange in resistance with temperature is fairly constant at about ohms per C. Athigher temperatures the change becomes less and non-linear correction is needed that isbeyond the scope of this note. For simplicity we will consider the device to be values of RTD 0 C resistances are available from a few tens of ohms to tenthousand ohms. A 10K RTD would have a resistance change per C of 39 ohms.
range of 100 uA to 1 mA for a 100 ohm RTD. For this example we will use VR = -5.00 volts and R1 = 10K so that the constant current through a 100 ohm RTD is 500 uA.
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