Thermocouples and RTDs are the most widely used industrial thermometers (also called temperature sensors).They generally consist of two ends and five components:Two ends: Measuring end & Connection end.Five components: Temperature sensing element, insulation assembly, protection tube, connection assembly, and mounting fixture.
Thermocouples and RTDs differ only in the sensing element; all other parts and structures are identical.A product using a thermocouple sensing element is called a thermocouple thermometer (thermocouple for short).A product using an RTD sensing element is called an RTD thermometer (RTD for short).
Performance Features
Assembled thermocouples / RTDs feature:
Simple structure, easy manufacturing, high popularity and large usage
Large diameter, high strength, convenient installation and maintenance
Common diameters: φ12, φ16, φ20
Standard length generally ≤ 3 meters
Support custom production, but with relatively low efficiency and higher cost
Thermal response time slower than MI (mineral-insulated) thermocouples / RTDs
Classification & Applications
By protection tube:Standard type, reduced-bore type, wear-resistant type, anti-corrosion type, high-temperature type, etc.
By connection head:Simple type, waterproof type, explosion-proof type, local-display type, etc.
By mounting:Fixed-free, threaded, flanged, ferrule-type, etc.
Assembled thermocouples / RTDs are widely used for temperature measurement in industrial equipment and processes, such as electric furnaces, ovens, tanks, pipelines, and various combustion, heating, and physical–chemical reaction systems.
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