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The accuracy and response time of NTC and PTC thermistor sensors are two very critical performance indicators. Let me tell you in detail how they are controlled!
 Độ chính xác và thời gian đáp ứng của cảm biến nhiệt điện trở |
 Thu thập từ xa cổng nối tiếp RS485 TTL MODBUS RTU 10K 3950 Cảm biến nhiệt độ NTC |
 304 stainless steel food probe NTC temperature sensor accuracy and response time |
Accuracy control
To improve the accuracy of thermistors, we can start from the following aspects:
Choose the right model: The accuracy of different types of thermistors will also vary. Vì thế, when choosing, we have to select those with smaller temperature coefficients and higher accuracy according to specific application requirements.
Optimize circuit design: When designing the circuit, the linearity and stability of the thermistor must be fully considered. Through reasonable circuit configuration, such as using two-wire, three-wire or four-wire methods, we can reduce measurement errors and thus improve accuracy.
Use high-precision ADC: The accuracy of the analog-to-digital converter (ADC) also has a great impact on the overall measurement accuracy. Choosing an ADC with high resolution and low noise can further improve the accuracy of temperature measurement.
Signal conditioning: Through precise signal conditioning, such as amplification, filtering, and linearization, we can reduce noise and nonlinear errors, so that the measured results are more stable and accurate.
Temperature compensation: In order to reduce the impact of ambient temperature changes on the measurement results, we can also add a temperature compensation mechanism to the design.
Continuous monitoring and calibration: Don’t forget that the performance of thermistors will change over time. Vì thế, we must regularly monitor their performance and perform necessary calibrations to ensure long-term stability.
Response time control
As for response time, it is an important indicator to measure how quickly the thermistor responds to temperature changes. To improve the response time, we can try these methods:
Choose the right model: As mentioned earlier, different models of thermistors have different response times. Choosing models with shorter response times will naturally increase the response speed of the system.
Optimize circuit design: In circuit design, we can take some measures to reduce the time constant of the circuit, such as using low-noise circuit components. Bằng cách này, the response time of the thermistor can be improved.
Improve the temperature control algorithm: For systems that need to respond quickly to temperature changes, we can also optimize the temperature control algorithm. Ví dụ, by using the proportional-integral-derivative (PID) control algorithm, we can adjust the temperature of the system more quickly by adjusting the parameters of the controller.
Bố trí cảm biến nhiệt độ hợp lý: Vị trí và cách bố trí các cảm biến nhiệt độ cũng sẽ ảnh hưởng đến thời gian phản hồi. Nếu vùng tiếp xúc giữa cảm biến và vật thể được đo lớn, quá trình trao đổi nhiệt sẽ nhanh hơn và thời gian đáp ứng đương nhiên sẽ ngắn hơn. Tuy nhiên, xin lưu ý rằng diện tích tiếp xúc quá lớn cũng có thể dẫn đến sai số đo tăng lên, vì vậy chúng ta phải đánh đổi dựa trên tình hình thực tế.