Description
A Platinum Thermocouple is a high-temperature sensor that uses platinum and platinum-rhodium alloys to provide stable, accurate temperature measurement in demanding industrial environments. These thermocouples are commonly selected for applications where base-metal thermocouples cannot provide the required long-term stability, oxidation resistance, or measurement reliability.
The Aavad Instrument Model ASFS Platinum Thermocouple is a compact Type S ceramic tube thermocouple designed for continuous temperature measurement up to 1400°C. Its Platinum-10% Rhodium / Platinum (Pt10%Rh/Pt) sensing element delivers dependable performance in oxidizing and inert atmospheres, making it suitable for high-temperature industrial processes requiring reliable long-term operation.
Unlike longer furnace thermocouples intended for deep insertion, this model features a compact 600 mm overall length below the terminal head, making it ideal for installations where space is limited or shorter insertion depths are sufficient. The sensing element is protected by a 450 mm high-purity ceramic protection tube, while a 25 mm SS310 holding tube provides mechanical support outside the hot zone.
A distinguishing feature of this model is its flameproof die-cast aluminium terminal head with IP67 protection, allowing installation in hazardous industrial environments where a standard weatherproof enclosure may not be appropriate. This combination of compact construction and flameproof protection makes it well suited for demanding process areas in the glass, steel, petrochemical, and process industries.
Key Features
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Certified Flameproof IP67 Terminal Head Enclosure Engineered to contain internal arcing and prevent flame propagation into classified hazardous atmospheres.
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Material-Focused Platinum Construction ($text{Pt-10%Rh / Pt}$) Type S noble-metal alloy delivers high accuracy, chemical stability, and oxidation resistance up to 1400°C.
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Compact 600 mm Total Length Below Head Optimized for tight spatial clearances and shallow-immersion hazardous-area applications.
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Single Ker-710 High-Purity Alumina Protection Sheath Impervious 99.7% alumina ceramic tube shields platinum wires from direct hot gas ingress.
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25 mm SS310 Metallic Support Holding Tube High-chromium steel holding sleeve provides structural mounting stability near the wall entry.
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Self-Powered Passive Signal Generation Converts process heat directly into a linear millivolt signal without requiring external power supplies.
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Streamlined Single-Protection Architecture Provides a cost-effective, space-saving design where full double-ceramic protection is unnecessary.
Applications
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Glass melting furnaces and crown temperature monitoring
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Metallurgy, steel, and foundry high-temperature processes
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Ceramic kilns and refractory manufacturing
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Petrochemical reactors and high-temp processing
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Aerospace, engine research, and laboratory testing
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Calibration and reference-grade temperature measurements
Datasheet
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Hazardous-Zone Glass Melting and Crown Monitoring Thermal acquisition in classified areas surrounding glass furnaces, forehearths, and feeder crowns.
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Petrochemical Reactors and Synthesis Gas Units High-temperature measurement in explosive atmosphere processing vessels and incinerators.
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Metallurgical and Steel Heat-Treating Furnaces Thermal control in hazardous furnace zones, gas-fired annealing lines, and forging units.
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Ceramic, Refractory, and High-Heat Kilns Precision monitoring in gas-fired kilns located within classified plant areas.
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R&D Test Benches and Aerospace Combustion Rigs High-precision temperature measurement in volatile combustion testing environments.
FAQs
1. What is a Platinum Thermocouple?
A Platinum Thermocouple is a high-temperature industrial temperature sensor that uses platinum and platinum-rhodium conductors to provide highly accurate and stable temperature measurement. Platinum thermocouples are available as Type R, Type S, and Type B, making them ideal for furnaces, kilns, heat treatment plants, glass manufacturing, and other high-temperature industrial processes.
2. Is this a Type S Platinum Thermocouple?
Yes. The ASFS Platinum Thermocouple uses a Type S (Pt-10% Rhodium / Platinum) sensing element engineered for reliable, accurate, and long-term temperature measurement in industrial applications up to 1400°C.
3. Why are Platinum Thermocouples used instead of Base-Metal Thermocouples?
Platinum Thermocouples offer superior oxidation resistance, exceptional long-term stability, low calibration drift, and reliable performance at temperatures where base-metal thermocouples such as Type K, J, N, and T may experience increased drift or reduced service life. This makes platinum thermocouples the preferred choice for precision high-temperature applications.
4. Why does this Thermocouple have a Flameproof Terminal Head?
The IP67 Flameproof Terminal Head is designed for installation in hazardous industrial areas where protection against ignition risks is required. Its rugged enclosure helps contain any internal electrical ignition, making the thermocouple suitable for use in hazardous locations when installed in accordance with the applicable area classification, certification requirements, and installation standards.
5. What is the maximum operating temperature?
The ASFS Platinum Thermocouple is designed for continuous operation up to 1400°C. Actual service life and performance depend on the process atmosphere, installation method, and operating conditions. Proper ceramic protection helps maintain long-term measurement accuracy.
6. Why is Ceramic Protection required?
High-purity ceramic protection tubes electrically insulate the platinum-rhodium sensing element while protecting it from contamination, thermal shock, oxidation, and mechanical damage in high-temperature furnace environments. This protection enhances reliability, extends thermocouple life, and ensures accurate temperature measurement.
7. Which industries commonly use Platinum Thermocouples?
Platinum Thermocouples are widely used in glass manufacturing, steel plants, ceramic processing, petrochemical industries, heat treatment facilities, power generation, research laboratories, calibration laboratories, aerospace testing, and other industries requiring precise and stable high-temperature measurement.
8. Can this Platinum Thermocouple be customized?
Yes. Aavad Instrument Pvt. Ltd. Platinum Thermocouples are manufactured to meet specific industrial requirements. We offer customized insertion lengths, ceramic protection tubes, flange sizes, process connections, flameproof or weatherproof terminal heads, and Type R, Type S, or Type B sensing elements to ensure optimum performance in demanding high-temperature applications.
