Product Introduction
Heat Sensitive Resistors represent two leading technologies in contact temperature sensing, each leveraging distinct physical principles to deliver reliable measurements:
● Thermocouples: Based on the Seebeck effect, these sensors consist of two dissimilar metal wires joined at one end (the hot junction). When a temperature gradient exists between the hot junction (measurement point) and the cold junction (reference point), a millivolt-level voltage signal is generated-directly correlating to temperature changes. Available in configurations like J, K, T, E (standard) and R, S, C (high-temperature grades), they accommodate extreme temperature ranges up to 1800°C.
● Heat Sensitive Resistors (RTDs): These sensors utilize the positive temperature coefficient of pure metals (e.g., platinum, copper, nickel)-their electrical resistance increases linearly with temperature. Platinum RTDs (e.g., PT100, PT1000) are industry benchmarks, with PT100 offering 100Ω resistance at 0°C and a precise 0.385Ω/°C resistance increase. Renowned for exceptional stability, RTDs excel in applications requiring accuracy within ±0.05 to ±0.1°C.
Both sensor types are classified by their sensing element structure:
● Assembly-Type Sensors: Characterized by simple construction and low initial cost, but limited by poor vibration resistance and fragility, leading to gradual obsolescence in industrial settings.
● Armor-Type Sensors: The advanced industry standard, featuring a robust integrated structure. The armor element combines the sensing component, magnesium oxide (MgO) insulation powder, and metal casing-forged into a solid, flexible entity via precision drawing. Paired with terminal boxes, protective tubes, and mounting hardware, these sensors offer superior durability and performance.
Features
Our armor-type thermocouples and RTDs integrate cutting-edge design with industrial-grade reliability, boasting the following key advantages:
Compact & Flexible
Armor elements with diameters as small as 3mm (customizable to <3mm) enable installation in confined spaces, while bendable construction adapts to complex equipment geometries.
Extreme Environment Resistance
Metal casings (304/321/316 stainless steel, 2520 alloy) withstand corrosion, high pressure, and vibration. Thermocouples handle temperatures up to 1800°C, while RTDs operate from -200°C to 850°C, covering virtually all industrial temperature needs.
Rapid & Stable Response
Armor-type sensors achieve thermal response times (T0.5) as fast as 0.4 seconds (thermocouples) and 0.5 seconds (RTDs), ensuring real-time data capture. RTDs further deliver long-term stability with minimal drift (≤0.01°C/year), reducing calibration frequency.
High Precision & Compatibility
RTDs offer ±0.1°C accuracy (PT1000), while thermocouples provide ±0.2 to ±0.5°C precision. Both integrate seamlessly with PLCs, DCS systems, and legacy monitoring equipment via standard transmitters.
Applications
These sensors are trusted across 10+ critical sectors, driving efficiency and safety in temperature-critical processes:
Oil & Gas
Monitor refining reactors, pipeline temperatures (natural gas/coal gas transmission), and offshore drilling equipment-with corrosion-resistant casings protecting against harsh hydrocarbons.
Chemical & Pharmaceutical
Regulate reaction kettle temperatures (800-1200°C for high-temperature processes) and maintain precision in drug formulation (RTDs for ±0.05°C control in bioreactors).
Metallurgy & Manufacturing
Track steel rolling furnace temperatures (800-1200°C) with thermocouples and ensure semiconductor wafer quality via RTD-controlled annealing processes.
Energy & Power
Monitor boiler and turbine temperatures in power plants, supporting stable energy generation while preventing equipment overheating.
Food & Light Industry
Ensure food safety via precise temperature control in baking ovens and refrigeration units (RTDs for ±0.1°C stability) and monitor packaging machinery thermal cycles.
Building Materials & Infrastructure
Regulate cement kiln temperatures and monitor gas pipeline networks, with armor-type durability ensuring long service life in harsh construction environments.
FAQ
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