What is the difference between thermocouple k and e-type

1. What is a thermocouple
A thermocouple is a sensor that uses the thermoelectric effect to measure temperature. It consists of wires of two different metals (usually copper and conventional alloys) connected together to form a circuit circuit. When there is a temperature difference at the junction of two metals, a thermoelectric potential (thermoelectric voltage difference) is generated.
2. K-type thermocouple
K-type thermocouple is one of the common types of thermocouples. It is composed of armored insulated wires, and the metal part is made of nickel chromium alloy and copper. K-type thermocouples are suitable for a wide temperature range and can typically measure temperatures from -200 ℃ to+1250 ℃. It has good linear characteristics and high sensitivity, and is widely used in industrial, scientific experiments, and temperature control systems.
3. E-type thermocouple
E-type thermocouples are also one of the common types of thermocouples. It is composed of nickel chromium alloy and nickel. E-type thermocouples are suitable for lower temperature ranges and can typically measure temperatures from -200 ℃ to+900 ℃. Compared with k-type thermocouples, e-type thermocouples have higher thermoelectric potential and lower thermoelectric temperature coefficient, therefore they have better sensitivity and performance in low-temperature measurements.
4. Differences between K-type and E-type thermocouples
The K-type thermocouple is composed of nickel chromium alloy and copper, while the E-type thermocouple is composed of nickel chromium alloy and nickel.
The applicable temperature range is different: K-type thermocouples are suitable for the temperature range of -200 ℃ to+1250 ℃, while E-type thermocouples are suitable for the temperature range of -200 ℃ to+900 ℃.
The relationship between thermoelectric potential and temperature is different: due to different metal compositions, the relationship between thermoelectric potential and temperature of k-type and e-type thermocouples is also different. E-type thermocouples have higher thermoelectric potential and lower thermoelectric temperature coefficient at low temperatures, making them more effective in low-temperature measurements.
From the above introduction, it can be seen that there are significant differences between k-type and e-type thermocouples in terms of metal composition, applicable temperature range, and the relationship between thermoelectric potential and temperature. When selecting thermocouples, make appropriate choices based on measurement requirements and temperature range to ensure the accuracy and reliability of measurement results.