August 14, 2025
Temperature Sensor Types Explained: NTC, PTC, RTD & Thermocouples by Focusensing
Quick Answer: There are four main temperature sensor types: (1) NTC thermistors — best accuracy (±0.1°C) for -55°C to +200°C, used in HVAC, automotive, and medical; (2) PTC thermistors — self-resetting overcurrent protection at the Curie point, used in motor protection; (3) PT100/PT1000 RTDs — ±0.15°C Class A linearity (DIN EN 60751), ideal for industrial process control; (4) Thermocouples — the only sensor reaching 1600°C, used in exhaust and furnace applications. As demand for industrial automation and smart devices continues to grow, the global temperature sensor market is expanding rapidly. According to industry reports, the market was valued at USD 7.699 billion in 2024 and is expected to reach USD 8.030 billion in 2025, surpassing USD 12.234 billion by 2035. China-based Focus Sensing and Control Technology Co., Ltd. (Focusensing), with over 15 years of experience, has launched a comprehensive range of temperature sensor solutions, including NTC thermistors, PTC thermistors, RTDs, thermocouples, and digital sensors. These products target buyers in automotive, battery management, home appliances, medical devices, and industrial control sectors. For a side-by-side specification comparison of all four sensor types — including accuracy data, temperature ranges, and application selection tables — see our Complete NTC vs PTC vs RTD vs thermocouple comparison guide Common Temperature Sensor Types Thermocouple Sensors Thermocouples use the voltage generated at the junction of two dissimilar metals to measure temperature, offering an extremely wide range (-200°C to 2300°C). They are cost-effective, heat-resistant, and vibration-proof, making them ideal for furnaces, exhaust systems, and metallurgy. Focusensing offers industrial-grade K-type and J-type thermocouples with reinforced designs for harsh environments. thermopile vs thermocouple: working principle and output comparison RTD (Resistance Temperature Detector) Sensors RTDs use platinum elements whose resistance changes linearly with temperature, providing excellent stability and precision. Common types include Pt100 and Pt1000. Focusensing produces both thin-film and wire-wound RTDs, widely used in food processing, petrochemical control, and medical equipment. 2-wire vs 3-wire vs 4-wire RTD: PT100 and PT1000 accuracy comparison NTC Thermistors Negative Temperature Coefficient (NTC) thermistors decrease in resistance as temperature rises. They are highly sensitive, cost-efficient, and fast-responding, making them perfect for household appliances, electronics, and battery monitoring. Focusensing’s NTC range includes epoxy-coated, glass-encapsulated, and digital-output models. See our complete NTC thermistor specification and application guide PTC Thermistors Positive Temperature Coefficient (PTC) thermistors increase in resistance with rising temperatures, sharply above a threshold, making them ideal for overcurrent protection and self-regula...
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