Temperature Measurement

Introduction Temperature measurement is one of the significant functions in the field of measurement, which has been most frequently conducted in meteorological observation, environmental research, laboratories, and various other production processes. Temperature measurement is fundamental and important in terms of manufacturing products in a specified condition and maintaining consistent quality in the industry. Therefore, this describes the measurement principles of the thermocouples and resistance temperature detectors (RTD) in temperature sensors most often used in temperature measurements carried out by the field of industry.   1. What are Thermocouples? Thermocouples are temperature sensors. They operate under the principle that the junction […]

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RTD vs Thermocouple

Resistance temperature detectors (RTDs) An RTD sensing element consists of a wire coil or deposited film of pure metal. The element’s resistance increases with temperature in a known and repeatable manner. RTDs exhibit excellent accuracy over a wide temperature range and represent the fastest growing segment among industrial temperature sensors. Their advantages include: Temperature range: Minco models cover temperatures from ¬260 to 850°C (¬436 to 1582°F). Repeatability and stability: The platinum resistance thermometer is the primary interpolation instrument used by the National Institute of Standards and Technology from ¬260 to 962°C. Ordinary industrial RTDs typically drift less than 0.1°C/year. Sensitivity: […]

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Types of Temperature Transducers

Thermocouples When two wires with dissimilar electrical properties are joined at both ends and one junction is made hot and the other cold, a small electric current is produced proportional to the difference in the temperature. Seebeck discovered this effect. It is true no matter how the ends are joined so the cold end may be joined at a sensitive millivolt meter. The hot junction forms the sensor end. The picture shows a typical industrial probe with a flexible extension and standard plug. Thermocouples come in several forms. They may be wires insulated from each other with plastic or glass fibre materials. For high temperature […]

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