The type of temperature sensors chosen for extraction and the boiler is PT100 platinum resistance thermometer (PRT). What is the accuracy of a platinum resistance thermometer?Ĥ.4. → Disadvantages of Platinum Resistance thermometer:- 1 High Cost 2 Requires additional equipment such as bridge circuit Power supply etc. What are the advantages and disadvantages of platinum resistance thermometer?Īdvantages of Platinum Resistance thermometer:- 1 High accuracy of measurement 2 Measurements of temperature can be made over a wide range of temperature i.e. The sensor is usually made to have a resistance of 100 Ω at 0 ☌. What is temperature coefficient of platinum resistance thermometer?Ĭommercial platinum grades exhibit a temperature coefficient of resistance 0.00385/☌ (0.385%/☌) (European Fundamental Interval).
It is used both for precision measurements of the highest accuracy and for routine industrial work. The platinum resistance thermometer is a versatile instrument for temperature measurement in the range from - 200° to 1000☌. Working Principle of Resistor Ohm’s law states that if I is the current flowing through the resistor in amperes, and R is the resistance in ohms, then V is the voltage drop that is imposed by the resistor (it is the electrical potential difference between the two contacts that are attached.) Where is platinum resistance thermometer used? What is the working principle of resistance? An electrical current is passed through the sensor, the resistance element is used to measure the resistance of the current being passed through it. What is the working principle of a resistance thermometer?Īn RTD works by using a basic principle as the temperature of a metal increases, so does the resistance to the flow of electricity.
With air as a thermometric substance can be used to measure temperature upto 600 0C.Ĥ. If V 0, V 100, V t are parameters of volume. Principle: The increase in volume of a gas at constant pressure is directly proportional to increase in its temperature. Constant pressure gas thermometer: These thermometers are based on the thermal expansions of gases at constant pressure. Range: Constant hydrogen gas thermometers has different range with different bulbs usedģ. If P 0, P 100, P t are parameters of pressure. Principle: The increase in pressure of a gas at constant volume is directly proportional to increase in the temperature. Constant volume gas Thermometer : These thermometers are based on the thermal expansion of gases at constant volume. Range: For mercury thermometer upto 300 0C.Ģ. If l 0, l 100, l t are the parameters of length. Principle: The increase in volume of the liquid in the glass bulb is directly proportional to increase in the temperature. Liquid Thermometres: These thermometers are based on the thermal expansion of liquids. Thermometer: The instrument used to measure the temperature is called is called Thermometre.Ĭlassification: The classification is depending upon the physical property of the substance that varies with temperature.ġ. In this article let X 0, X 100, X t be the parameters at ice point, steam point and unknown temperature, respectively. Concept: A thermometric property like length of a wire, resistance of a metallic and volume of a gas proportional to temperature.