S type thermocouple senor is an internationally recognized precious metal thermocouple, consisting of platinum rhodium alloy (platinum 90%, rhodium 10%) as the positive electrode (SP) and pure platinum as the negative electrode (SN). Due to its excellent high temperature resistance, high precision, and long-term stability, it is widely used in industrial high-temperature measurement, scientific research experiments, and precision instrument fields, especially suitable for oxidizing and inert atmosphere environments.
Product Introduction
1、 Product Overview
S type thermocouple senor is an internationally recognized precious metal thermocouple, consisting of platinum rhodium alloy (platinum 90%, rhodium 10%) as the positive electrode (SP) and pure platinum as the negative electrode (SN). Due to its excellent high temperature resistance, high precision, and long-term stability, it is widely used in industrial high-temperature measurement, scientific research experiments, and precision instrument fields, especially suitable for oxidizing and inert atmosphere environments.
2、 Working principle
The S type thermocouple senor operates based on the Seebeck Effect, which means that when there is a temperature difference between two different metal conductors at both ends, a thermoelectric potential is generated. The temperature value can be calculated by measuring the thermoelectric potential (mV). Its temperature electromotive force relationship complies with the IEC 60584-1 international standard, with good linearity, and performs particularly well in the high temperature range (above 1000 ° C).
3、 Technical parameters
Project parameter description
Division number S
Temperature measurement range for long-term use: 0~1450 ° C; Short term limit: 1600 ° C (customizable up to 1700 ° C)
Accuracy level I: ± 1 ° C or ± 0.25% t (t is the measured temperature)
Level II: ± 1.5 ° C or ± 0.25% t
Standard wire diameter specifications: 0.5mm, 0.8mm, 1.0mm (optional armor or ceramic sheath)
Protective tube material: High temperature ceramic (Al ₂ O ∝), quartz tube, molybdenum titanium alloy (customized according to the usage environment)
Response time bare wire status:<1 second (at 1600 ° C); With protective tube: 3-10 seconds (depending on diameter and material)
4、 Product Features
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Excellent high-temperature performance
Can work stably for a long time at 1600 ° C, with excellent oxidation resistance, suitable for extreme environments such as metallurgy and glass melting furnaces.
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High precision and stability
Repetitive error ≤ 0.1%, annual drift<0.05%, meeting the high-precision temperature measurement requirements of laboratories and industries.
Strong anti pollution ability
Platinum rhodium alloy material is resistant to chemical corrosion, stable in sulfur-containing, hydrogen and other atmospheres, and has a long service life.
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International standardization
Compliant with standards such as IEC 60584-1 and ASTM E230, compatible with mainstream temperature control instruments.
5、 Typical application areas
Industrial high-temperature scenarios: steel smelting, ceramic sintering, semiconductor wafer processing
Research experiments: High temperature material research, aerospace engine testing
Energy industry: gas turbine exhaust monitoring, nuclear reactor temperature control
Laboratory equipment: High temperature furnace, thermal analyzer (TGA/DSC)
6、 Selection Guide
Temperature and protection tube selection
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≤ 1300 ° C: Ceramic (Al ₂ O ∝) protective tube is recommended for high cost-effectiveness.
1300-1600 ° C: High purity dense ceramic or molybdenum titanium alloy protective tube is required.
Short term 1700 ° C: Optional bare wire structure without protective tube (requires inert atmosphere protection).
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Wire diameter and response speed
The thinner the wire diameter, the faster the response, but the mechanical strength decreases. Recommend a wire diameter of 0.5mm for dynamic temperature measurement and 1.0mm for fixed installation.
Extension cable selection
The compensating wire should be selected as SC (copper copper nickel alloy) type, with a working temperature of -20~100 ° C to ensure signal transmission accuracy.
7、 Precautions for use
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Installation specifications
Avoid long-term use in reducing atmospheres such as CO and H ₂, as it may cause embrittlement of the platinum electrode.
The protective tube should be installed vertically or horizontally to avoid mechanical vibration causing breakage.
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Pollution control
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It is strictly prohibited to come into contact with metal vapors (such as zinc and lead), otherwise it will contaminate the electrodes and cause thermoelectric potential drift.
Regularly clean the surface oxide of the electrode with 10% dilute hydrochloric acid (only applicable to non ceramic protective tubes).
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Calibration and maintenance
Perform high-temperature fixed-point calibration every 6 months (such as antimony point 630.63 ° C, copper point 1084.62 ° C).
8、 Market advantage
Compared to B-type and R-type thermocouples, S-type has a higher cost-effectiveness in the temperature range of 1300-1600 ° C; Compared to low-cost metal thermocouples such as K-type and N-type, their lifespan is extended by 3-5 times, making them particularly suitable for scenarios that require high reliability and accuracy.
9、 Service Support
Provide customized solutions (such as multi-point temperature measurement array, vacuum specific packaging)
