Temperature sensing components commonly used with electric heating elements
Thermal Protector
A thermal protector consists of two different metals, one of which has a temperature memory effect. Most manufacturers specify a range of specifications every 5°C, ranging from 25°C to 160°C. When the memory strip senses the temperature through contact with the surface of the electric heating element or the surface of the heated object, the contact point opens and the circuit is disconnected to form an open-circuit protection. It is widely used in the design of various small household appliances due to its easy installation and low cost.
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Metal thermal protector
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Plastic thermal protector |
Thermocouple
A thermocouple is perhaps the most common temperature sensor and is suitable for a wide range of temperature measurements. The most commonly used thermocouple is the K-type, which is made of nickel-chromium alloy or nickel-aluminum alloy and has a temperature measurement range of -200°C to +1200°C. Its advantages include low cost and short response time (within one second). However, due to material properties and other factors, the temperature accuracy is only about 1°C.
Resistance Temperature Detector
A thermocouple is perhaps the most common temperature sensor and is suitable for a wide range of temperature measurements. The most commonly used thermocouple is the K-type, which is made of nickel-chromium alloy or nickel-aluminum alloy and has a temperature measurement range of -200°C to +1200°C. Its advantages include low cost and short response time (within one second). However, due to material properties and other factors, the temperature accuracy is only about 1°C.
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RTD Platinum Temperature Sensor Range-70 to +600°C
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NTC（Negative Temperature Coefficient）
Thermistors are a type of variable resistor. Compared to the sensors mentioned above, the temperature measurement range of NTC thermistors is smaller (-200°C to 300°C), but their accuracy is the best (±0.05°C). Like RTDs, NTC thermistors require electrical stimulation. They are inexpensive, small in size, and lightweight, making them the most widely used temperature sensing components for electric heating elements.
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Glass NTC Thermistor
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Epoxy Coated NTC Thermistor
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Thin Film NTC thermistor
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SMD NTC Thermistor
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Epoxy NTC
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Film NTC
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Epoxy NTC V.S. Film NTC
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