Termometer Resistor

Termometer Resistor. Definition – The resistance thermometer or resistance temperature detector (RTD) uses the resistance of electrical conductor for measuring the temperature The resistance of the conductor varies with the time This property of the conductor is used for measuring the temperature The main function of the RTD is to give a positive change in.

Termometer Resistor Termometer resistor adalah termometer yang dibuat berdasarkan perubahan hambatan jenis suatu penghantar karena adanya perubahan suhu Termometer resistor memiliki thermometric property berupa hambatan suatu konduktor Termometer ini berfungsi untuk mengukur suhu yang tinggi Persamaan fungsi termometer hambatan dapat ditulis .

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Resistance thermometers Resistance thermometers also called resistance temperature detectors ( RTDs ) are sensors used to measure temperature Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used The RTD wire is a pure material typically platinum nickel or copper.

Resistance thermometer Wikipedia

A thermistor is a temperature sensitive resistor They are often used as a temperature sensor The term thermistor is a contraction of the words “thermal” and “resistor” All resistors have some dependency on temperature which is described by their temperature coefficient In most cases the temperature coefficient is minimized but in the Author Robert Keim.

How does a resistance temperature detector (resistance

Operating PrincipleInfluence of Lead ResistancesPros and ConsA further measuring principle for determining the temperature is the change in the electrical resistance of a conductor when heated Thermometers based on such a principle are referred to as resistance thermometers or resistance temperature detector (RTD) In resistance thermometers the dependence of the electrical resistance on the temperature is used to determine the temperature! In RTDs a constant electrical current flows through a measuring conductor The currents are usually less than one milliampere to avoid excessive heating by the current According to Ohm’s law at a constant current the voltage at the measuring conductor varies depending on the electrical resistance (and thus on the temperature) In this way the measured voltage or voltage change can be used to determine the temperature A noncorrosive platinum conductor (Pt) with a nominal resistance of 100 Ω at a temperature of 0 °C is often used as the sensing resistor These characteristics give this type of resistan When measuring with resistance thermometers the lead resistanceof the measuring leads must always be taken into account After all the measuring instrument not only measures the resistance of the actual sensing resistor but also the resistance of the measuring leads In general the higher the nominal resistance of the sensor at 0 °C the lower the share of lead resistances on total resistance Accordingly the temperature measurement when using a Pt1000 is not as strongly influenced by the lead resistances as when using a Pt100 With a Pt100 the temperature measurement is falsified by about 05 °C per meter of connecting cable With a Pt1000 the value is 10 times lower (005 °C per meter connecting cable) The lead resistances can be compensated by fourwire sensing (also called fourterminal sensing) In this case the current source and voltage measurement are metrologically separated from each other This means that the voltage is no longer measured directly at the current In contrast to purely indicating temperature measuring instruments such as liquidinglas thermometers or bimetallic strip thermometers the electrical signal from resistance thermometers can directly be processed combined and evaluated with other data Resistance thermometers are also very robust and cover a wide temperature range from 200 °C up to +800 °C with high accuracy at the same time Depending on the application however the relatively large delay time of resistance thermometers can be a disadvantage ie resistance thermometers require some time until they have adapted to the temperature to be measured The thermocouples explained in the following article offer significantly shorter delay times.