Platinum Resistance Thermometer Images
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The thermometer is quite sensitive.
Platinum resistance thermometer images. Temperature coefficient of resistance tcr has many definitions. The meter gives the precise reading of temperature. The dominant standard adopted internationally is the pt100 which has a resistance value of 100 0 ohms at 0 c and a change of 38 50 ohms between 0 a nd 100 c the fundamental interval. However achieving nearly the same accuracy over a large range in temperatures is not possible unless several pull up resistors are used due to the highly nonlinear characteristic response.
These measure the temperature through a platinum wire that is attached to an electrical resistance that changes according to the temperature. Resistance temperature relationship of metals. The thermometer has a wide range from 200 to 1200 celsius. The relative change in resistance temperature coefficient.
The temperature measurement through platinum resistance thermometer is easier as compared to the gas thermometer. Thus thermistors can achieve very high sensitivities over a particular range of temperatures. In fact the platinum resistance temperature detector or rtd pt100 is used today as an interpolation standard from the oxygen point 182 96 c to the antimony point 630 74 c. For resistance thermometers tcr is normally defined as the average resistance change per c over the range 0 to 100 c divided by r.
Different resistance temperature curves of the same element material such as the three curves platinum. Therefore it has a wide operating range from 200 o c to 850 o c. At 0 c the resistance can be over 100 000 ω at 200 c 200 to 500 and at 800 c 50. His choice proved most propitious as platinum is used to this day as the primary element in all high accuracy resistance thermometers.
Its temperature resistance characteristics are most linear for the wide range of temperature. In this thermometer resistance of the material in thermometer increases directly with an increase of temperature. Resistance thermometers utilise a high precision sensing resistor usually platinum the resistance value of which increases with temperature. Generally used to measure outside temperatures it is very accurate albeit slow.
Apart from platinum some other metals like copper and nickel are also used for the construction of rtds.
A Platinum Resistance Temperature Detector Rtd Pt100 Is A Device With A Typical Resistance Of 100 W At 0 C It Is Called Pt100 Platinum Rope Bracelet Jewelry
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