Description
RTD Sensor with Bar-Stock Thermowell (Model APFD) is a heavy-duty duplex PT100 temperature sensor assembly designed for accurate and reliable temperature measurement in high-pressure, high-flow, and demanding industrial process applications. Featuring Duplex PT100 Class A sensing elements (3+3 wire), a precision-machined solid bar-stock SS316L thermowell, a rugged IP67 flameproof die-cast aluminium terminal head with double cable entry, and a 1/2-inch NPT Nipple-Union-Nipple (N-U-N) process connection, this industrial RTD assembly delivers dependable temperature measurement across an operating range of -50°C to +400°C. Unlike fabricated thermowells manufactured from welded pipe, the bar-stock thermowell is machined from a single solid piece of stainless steel, providing superior mechanical strength, pressure resistance, and durability for severe industrial service.
The tapered thermowell profile (28 mm to 24 mm) is engineered to withstand demanding operating conditions while maintaining good heat transfer to the duplex PT100 sensing elements. The N-U-N process connection allows maintenance personnel to disconnect and remove the sensor assembly without disturbing the main process connection, reducing maintenance time and downtime. Manufactured by Aavad Instrument, this RTD with bar-stock thermowell is ideal for refineries, petrochemical plants, oil and gas facilities, power generation, chemical processing, steam systems, and other critical industrial applications requiring reliable temperature measurement in high-pressure, abrasive, or high-velocity process media.
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Key Features
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Solid Machined Bar-Stock Thermowell Carved out of monolithic SS316L metal bar stock with zero welded seams to provide maximum structural safety under high pressure.
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Duplex Dual-Circuit Architecture Houses two completely independent 3-wire Pt100 elements to supply simultaneous control and emergency safety shutdown signals.
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Service-Friendly N-U-N Connection Integrated Nipple-Union-Nipple hardware allows quick sensor decoupling without unthreading or re-welding the main process pipe tap.
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Optimized Tapered Well Profile Shifting from 28 mm OD to a 24 mm tail provides a balance of fast thermal response times and elite resistance against fluid shear forces.
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Flameproof IP67 Terminal Enclosure Explosion-proof die-cast aluminum head provides absolute sealing against heavy dust, rain, and ignition hazards in volatile environments.
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Double Cable Entry Conduit Ports Twin wiring entries allow independent signal lines to exit the flameproof head without needing external splitter junction boxes.
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Low-Carbon SS316L Core Metallics Low-carbon stainless steel construction minimizes intergranular carbide precipitation during high-temperature operation.
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High-Precision Class A Compliance Delivers elite, highly repeatable temperature tracking with tight tolerance across all process phases.
Applications
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High-Pressure Chemical Processing Critical temperature monitoring inside volatile, high-velocity chemical reactors, blending systems, and catalyst loops.
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Oil & Gas Refinery Infrastructure Continuous thermal tracking inside main crude transport lines, distillation towers, and high-abrasion slurry lines.
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Thermal Power Plant Steam Lines High-integrity monitoring within superheated steam manifolds, high-pressure boilers, and turbine feed lines.
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Volatile Classified Hazard Zones Safe process loops requiring flameproof gas compliance alongside heavy-duty mechanical shielding.
Datasheet
FAQs
1. What is a Bar-Stock Thermowell and why is it used with an RTD Sensor?
A Bar-Stock Thermowell is machined from a single solid piece of metal bar rather than fabricated from pipe, providing superior strength, pressure resistance, corrosion resistance, abrasion resistance, and mechanical durability. When used with a PT100 RTD Sensor, it protects the sensing element from harsh process conditions while allowing accurate temperature measurement and extending sensor service life.
2. What is the difference between a Bar-Stock Thermowell and a Fabricated Thermowell?
A Bar-Stock Thermowell is precision-machined from solid metal, offering higher mechanical strength and better resistance to high pressure, vibration, and process stress. In contrast, a Fabricated Thermowell is manufactured from welded pipe or tube, making it a more economical option for applications with lower pressure and less demanding operating conditions.
3. What are the specifications of Aavad’s RTD with Bar-Stock Thermowell?
Aavad’s Model APFD is a duplex (3-wire + 3-wire) PT100 RTD Sensor with Class A accuracy and an operating temperature range of -50°C to +400°C. It features a 6 mm outer diameter (OD), 400 mm SS316 probe, a 1/2″ NPT (Male) Nipple-Union-Nipple (NUN) connection with a 150 mm SS316 extension, and an SS316L Bar-Stock Thermowell with a 28 mm OD tapering to 24 mm for demanding industrial applications.
4. Can the RTD be removed from a Bar-Stock Thermowell without stopping the process?
Yes. The PT100 RTD Sensor can be withdrawn from the Bar-Stock Thermowell for replacement, maintenance, or recalibration while the thermowell remains installed in the process. This eliminates the need for process shutdown, media loss, or breaking the pressure boundary, reducing maintenance time and improving plant safety.
5. What industries typically use RTD Sensors with Bar-Stock Thermowells?
RTD Sensors with Bar-Stock Thermowells are widely used in chemical and petrochemical processing, oil & gas pipelines, refineries, power plants, boilers, steam lines, food processing, pharmaceutical manufacturing, hygienic process systems, and other industrial applications involving high pressure, corrosive media, abrasive conditions, and demanding process environments.
