![]() The resistance is proportional to length and inversely proportional to the cross sectional area and is given by the relationship R = ρl/A The resistive property defines length and cross sectional area required to fabricate an RTD of a given value. The resistive property of the metal is called its resistivity. The resistance of the metal increases with temperature. RTD is a positive temperature coefficient device. In RTD, the output resistance changes with temperature. One of the most linear, stable, and reproducible temperature sensors is the RTD, Resistance Temperature Detector. Temperature Measurement using RTDįor measurement of Temperature number of sensors are available. Therefore, the resistance of an object can be defined as the ratio of voltage to current, in accordance with That means the resistance R is constants for the given temperature and material. For a wide range of materials and conditions, the electrical resistance does not depend on the amount of current through or the potential difference (voltage) across the object. The electrical resistance of an object is a measure of its opposition to the flow of an electric current. The commonly used other units of temperature are Degree Celsius (☌) and Degree Fahrenheit (☏). The basic unit of temperature (T) in the International System of Units (SI) is the Kelvin (K). Even if the large pot is much bigger than the cup and has millions and millions more water molecules. For example, the temperature of a small cup of boiling water is the same as the temperature of a large pot of boiling water. In that sense it does not depend on the size of it. Since it is an average measurement, it does not depend on the number of particles in an object. Temperature is a measure of the average heat or thermal energy of the particles in a substance. Knowledge of active and passive transducers. Meaning of terms like process lag, positive and negative temperature coefficient, negative temperature, virtual temperature, etc. ![]() Knowledge of various methods of temperature measurement. ![]() Various units of temperature measurement and conversion of one unit to another. Characterize the temperature sensor(RTD) Prerequisite:īefore performing the practical on RTD one must be well versed with:
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