Description
RTD Insert (Model APED-6×315) is a high-accuracy duplex PT100 RTD measuring insert designed for installation inside existing thermowells, protection tubes, and temperature sensor assemblies. Featuring two independent 3-wire PT100 sensing elements (3+3 wire) in a durable 6 mm OD × 315 mm SS316 stainless steel sheath, this Class A RTD insert provides precise and repeatable temperature measurement across an operating range of -50°C to +250°C. Its mineral-insulated, compacted MgO construction provides excellent thermal response and measurement stability, making it an ideal replacement RTD element for maintaining or upgrading existing industrial temperature measurement systems without replacing the complete sensor assembly.
Designed for industrial maintenance, retrofit, and spare-part applications, the Model APED-6×315 allows plant operators and OEMs to replace a failed, damaged, or drifted RTD sensing element while retaining the existing thermowell, protection tube, terminal head, and process connection. The duplex PT100 configuration provides two independent temperature signals from a single insert, supporting process control, indication, data logging, or redundant temperature monitoring. Manufactured by Aavad Instrument, this PT100 RTD insert sensor is available with customized insertion lengths, sheath dimensions, and wiring configurations to match existing temperature sensor assemblies in chemical plants, petrochemical facilities, power plants, furnaces, kilns, process industries, and industrial machinery.
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Key Features
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Duplex Element Replacment Cartridge Houses two completely independent 3-wire Pt100 platinum circuits inside a single probe body to deliver dual-signal redundancy without modifying existing hardware.
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Direct Fitting Modular Architecture Tailored to slide seamlessly into existing standard thermowells, protection tubes, and connection heads for fast retrofitting.
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High-Precision Class A Compliance Delivers exceptional thermal tracking accuracy and tight tolerance limits ($pm0.15^circtext{C}$ at $0^circtext{C}$) to match or exceed the performance of original factory components.
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Mineral-Insulated MgO Construction Tightly packed Magnesium Oxide internal insulation ensures long-term calibration stability and protects the internal wiring against operational vibrations.
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Cost-Efficient MRO Procurement Shipped without an external enclosure or fixed process threads to lower unit costs and accelerate lead times by eliminating redundant mounting hardware.
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Corrosion-Resistant SS316 Sheath Marine-grade stainless steel body with a 6 mm outer diameter provides structural strength and chemical resilience within protective thermowells.
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Standardized Insertion Geometry Built with a 315 mm standard length optimized to match standard process depths while supporting adjustable depth configuration options.
Applications
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Replacement Element for Existing Wells Direct drop-in maintenance swapping for aged, drifted, or failed temperature sensors inside operational processing lines.
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Retrofit and Spare Parts Standardization Consolidation of plant inventory by using identical, high-accuracy duplex inserts across multiple thermowells of the same bore size.
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Furnace and Heat Treatment Maintenance Rapid replacement servicing of thermal profiling elements inside industrial ovens, curing kilns, and metal treating equipment.
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Plant Turnaround and Shutdown Refurbishment High-volume sensor updates during scheduled petrochemical, refinery, and chemical processing plant maintenance turnarounds.
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Power Plant Instrumentation Overhauls Cost-effective rebuilding of temperature tracking networks inside steam generation loops, cooling infrastructure, and utility lines.
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Machinery OEM Component Sourcing Provision of bare, high-accuracy sensing elements for specialized equipment builders designing proprietary housing enclosures.
Datasheet
FAQs
1. What is an RTD Insert used for?
An RTD Insert is a replaceable PT100 Resistance Temperature Detector (RTD) measuring element designed to slide into a thermowell or protection tube, allowing quick sensor replacement, maintenance, or calibration without removing the outer assembly. Aavad’s RTD Insert (Model APED-6×315) is a duplex, mineral-insulated RTD insert with Class A accuracy and an operating temperature range of -50°C to +250°C.
2. What does “Duplex” mean in Aavad’s RTD Insert specification?
Duplex means the RTD insert contains two independent PT100 sensing elements in a single 6 mm OD mineral-insulated probe, typically configured as 3-wire + 3-wire. This allows redundant temperature measurement, dual-controller inputs, backup sensing, or simultaneous monitoring without installing a second sensor.
3. Why is Mineral Insulation important in an RTD Insert?
Compacted Magnesium Oxide (MgO) mineral insulation provides excellent electrical insulation, efficient heat transfer, mechanical strength, and vibration resistance. This enables the RTD insert to withstand elevated temperatures while maintaining fast response, stable performance, and accurate temperature measurement in demanding industrial applications.
4. Can the RTD Insert’s insertion length be customized?
Yes. Aavad Instrument manufactures RTD Inserts with custom insertion lengths, sheath diameters, sheath materials, and spring-loaded configurations to fit different thermowell depths and industrial installation requirements.
5. What is a Spring-Loaded Terminal Block and why does it matter for RTD Inserts?
A spring-loaded terminal block maintains constant contact pressure between the RTD sensing element and the thermowell tip, ensuring efficient heat transfer while minimizing measurement errors caused by vibration, thermal expansion, or mechanical movement. This design improves temperature measurement accuracy and long-term reliability.
