1, accuracy?
The measurement accuracy of thermocouple can be very high, but the problem is that there must be a complete system. Thermocouple is only a measuring unit, and it also needs the cooperation of signal processing unit. Such as compensation, signal amplification, conversion, etc. According to the national standard, the error accuracy of E-type thermocouple is 0.75%t for industrial grade and 0.25%t for precision grade. T is the actual temperature, that is, the minimum error of 100 degree is less than 0.25 degree. ? The premise is that there must be adaptive high precision: 0.2; High resolution: 0. 1 degree display instrument coordination. Otherwise, the goal will not be achieved at all, and the relationship between accuracy and resolution is still very close. ?
2. What is the response?
The response speed of thermocouple depends on the ratio of thermocouple volume to heat source, because the process of measuring temperature by thermocouple is actually the process of heat transfer between thermocouple and measured medium. The smaller the thermocouple, the faster the response speed. We can achieve a response speed of 0. 1s, and the thermocouple diameter is only 0.3mm?
3. Thermocouple can be completely portable! We have mass-produced and sold it. ?
4. Cold end compensation?
Cold junction compensation does not need a bridge arm circuit, but a 5 1 ohm copper thermal resistor is installed in the instrument circuit, and diode can also be used for automatic compensation, but the accuracy is relatively low. Do not understand DS 18B20. In the past, LM324 was used to amplify signals, and 7650 was used to convert signals into digital signals. In the display part, LCD display is driven by 7 106, and LED display is driven by 7 106.
There is a portable thermometer on the market now, which is very cheap. IC is burned directly on the circuit board. Why not buy one and study it? The model number is: 902C,
Sorry, I can only help you so much.