Description
Thermocouple with N-U-N (Nipple-Union-Nipple) Connection is a heavy-duty industrial temperature sensor engineered for high-temperature process monitoring where long insertion lengths and easy maintenance are essential. Equipped with a K-Type (Chromel-Alumel) sensing element, this thermocouple accurately measures temperatures from 0°C to 1200°C, making it ideal for furnaces, boilers, reactors, pressure vessels, petrochemical plants, and other demanding industrial applications.
Its defining feature is the Nipple-Union-Nipple (N-U-N) process connection, which allows technicians to disconnect and replace the thermocouple at the union without disturbing the process-side threaded connection. This significantly reduces maintenance time, minimizes thread wear, and helps avoid unnecessary process shutdowns during calibration or sensor replacement.
The 1250 mm insertion length makes the AKFS-10 particularly suitable for tall furnaces, deep process vessels, long ducts, boilers, and large reactors, where standard thermocouples cannot reach the desired sensing point. Its SS310 stainless steel protection sheath offers excellent resistance to oxidation, thermal shock, and high-temperature corrosion, ensuring reliable operation in continuous industrial service.
For hazardous locations, the thermocouple is fitted with a flameproof die-cast aluminium terminal head featuring an IP67 protection rating and double cable entry, providing secure wiring, environmental protection, and compliance with demanding industrial installations. An optional spring-loaded terminal assembly is also available for applications involving vibration or mechanical movement.
Key Features
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Nipple-Union-Nipple (N-U-N) Disconnect Industrial three-piece union layout permits fast sensor removal for calibration without touching the main pipeline threads.
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Deep 1250 mm Insertion Reach Long-format probe profile designed to measure deep interior thermal zones in massive process towers, tanks, and stacks.
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Premium K-Type Chromel/Alumel Elements Delivers highly linear, globally standardized millivolt tracking up to a peak limit of 1200°C.
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High-Temperature SS310 Protective Sheath Heavy-walled alloy casing specifically engineered to prevent scaling and oxidation in sustained high-heat zones.
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Flameproof IP67 Aluminum Housing Explosion-proof die-cast termination head safely isolates electrical sparks from volatile exterior plant environments.
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Dual Compression Cable Ports Double-entry gland system provides pristine, isolated wire routing while maintaining a tight environmental seal.
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Minimized Thread Wear and Tear Isolating maintenance activities to the union joint completely protects the permanent process-vessel tapping threads.
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Available Spring-Loaded Terminal Block Optional interior configuration maintains tight, reliable contact under constant heavy machine vibration.
Applications
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Tall Furnace Stacks and Thermal Flues Centerline gas profiling across large combustion exhausts, waste heat recovery systems, and incinerators.
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Deep Process Vessels and Chemical Tanks Continuous core temperature tracking within massive product storage tanks and processing reactors.
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Petrochemical and Oil & Gas Refining Lines Safe, highly serviceable temperature monitoring across high-pressure cracking units and cross-country pipelines.
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Power Generation Boiler and Steam Networks High-reliability thermal instrumentation for superheater outlets, main steam headers, and turbine feeds.
Datasheet
FAQs
1. What is a Thermocouple with N-U-N Connection?
A Thermocouple with N-U-N (Nipple-Union-Nipple) Connection is an industrial temperature sensor that uses a removable union fitting between threaded nipples. This design allows the thermocouple to be serviced, calibrated, or replaced without removing or disturbing the process-side connection, reducing maintenance time while preserving the integrity of the threaded process connection.
2. Why is an N-U-N connection beneficial?
An N-U-N connection enables quick sensor replacement and calibration without modifying the process connection or repeatedly removing threaded fittings. It improves maintenance efficiency, minimizes equipment downtime, reduces installation costs, and extends the service life of threaded process connections in demanding industrial applications.
3. Where are Thermocouples with N-U-N Connections used?
Thermocouples with N-U-N Connections are widely used in power plants, chemical processing industries, petrochemical refineries, oil & gas facilities, industrial furnaces, boilers, pressure vessels, reactors, deep tanks, heat exchangers, and industrial automation systems where long insertion lengths, easy maintenance, and reliable temperature measurement are essential.
4. Why choose Aavad Instrument Thermocouple with N-U-N Connection?
Aavad Instrument Pvt. Ltd. Thermocouples with N-U-N Connection are manufactured using premium-quality materials, advanced manufacturing techniques, and stringent quality control standards to ensure accurate temperature measurement, long service life, and dependable performance in demanding industrial environments. We offer customized configurations including sheath material, insertion length, process connection, terminal head, thermocouple type, and cable options to meet the specific requirements of various industrial applications.
