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Anticorrosive 316 Material, High Temperature Resistant Thermal Resistor
A thermal resistor is a sensor that measures temperature by utilizing the characteristic that the resistance value of a metal material changes with temperature. Generally, the higher the temperature, the greater the resistance value of the metal, and there is a definite functional relationship between them.
Typical Applications
Semiconductor Thermistors (Thermistors)
NTC Thermistors
Characteristics: Negative temperature coefficient, resistance decreases significantly with temperature increase, high sensitivity but poor linearity.
Applications: Motor overheating protection, lithium battery over-temperature monitoring, environmental temperature compensation.
PTC Thermistors
Characteristics: Positive temperature coefficient, resistance increases sharply after a specific temperature point, used for temperature switches and current limiting protection.
Applications: Industrial temperature control, household appliances (such as electric heaters).
Product Advantages
Wide measurement range: Especially for Pt100, it covers a range from near absolute zero to hundreds of degrees Celsius.
Good linearity: The curve of resistance versus temperature is relatively smooth, facilitating signal processing.
Good interchangeability: Standardized production allows components of the same model to be interchangeable.
Thermocouple vs. Thermal Resistance
Characteristics
Thermocouple
Thermal Resistance
Principle
Seebeck effect (electricity generated by temperature difference)
Resistance changes with temperature
Signal
Millivolt voltage (mV)
Resistance value (Ω)
Measurement range
Wide, especially at high temperatures (-200°C to +1800°C)
Moderate to low temperatures (-200°C to +850°C)
Accuracy
Relatively low
High
Sensitivity
Low (small output signal)
High (large output signal change)
Cost
Low (standard type)
High
Core challenges
Cold junction compensation
Lead resistance compensation (3-wire/4-wire system)
Relatively simple, usually requires constant current source
Response speed
Fast
Slow
Typical applications
Boilers, furnaces, engine exhaust, and other high-temperature environments
Process control, HVAC, and precise temperature measurement in laboratories
Application scenarios
High-temperature fields: Monitoring the temperature of molten iron in the metallurgical industry (1600℃), and the cooling agent system of nuclear power reactors.
Low-temperature fields: In the cold chain transportation of vaccines (-70℃), dual-redundant thermal resistors ensure that the temperature fluctuation is ≤ ±0.5℃.
Special environments: In deep-sea exploration (high pressure) and corrosive chemical environments, thermal resistors encapsulated in 316L stainless steel or nickel-based alloys can work stably for a long time.
Industrial automation: Process temperature control in fields such as steel, petrochemicals, and power, such as real-time monitoring of heating furnaces and distillation columns.
New energy industry:
① Thermal management of power batteries: The purchase volume of thermal resistors in the new energy vehicle field is expected to increase by 35% year-on-year in 2025.
② Temperature monitoring of photovoltaic inverters and wind power converters to improve power generation efficiency and equipment lifespan.
Medical and scientific research:
① Temperature calibration of medical incubators and MRI equipment to ensure the activity of biological samples.
② High-precision temperature field control in laboratories to support material research.
