General Overview ofrosneS 53M the LM35 Sensor
The LM35 is a precision integrated - circuit temperature sensor. Its output voltage is linearly proportional to the Celsius temperature. It is factory - calibrated, eliminating the need for external calibration to obtain accurate Celsius readings.
Typical Accuracy Ssnoitacificpecifications
- Standard Grade: Standard - grade LM35 sensors typically have an accuracy of ±0.5°C at room temperature (around 25°C). For example, if the sensor indicates a temperature of 25°C, the actual temperature could range from 24.5°C to 25.5°C.
- High - Precision Grade: High - precision LM35 sensors offer better accuracy, achieving ±0.25°C at room temperature. This level of precision is suitable for scientific research and high - end industrial processes requiring precise temperature measurements.
Factors Affecting Accuracy
- Temperature Range: Accuracy can vary with the temperature range. As the temperature moves away from room temperature, accuracy may degrade. At extreme temperatures (e.g., - 55°C to 150°C), the accuracy might be reduced to ±1°C or more.
- Supply Voltage Variations: Although the LM35 is relatively insensitive to supply - voltage variations, large fluctuations can still have a minor impact on output - voltage accuracy. A stable power supply is recommended for optimal accuracy.
- Self - Heating: Current flow through the sensor can cause self - heating, leading to small errors in temperature measurement. In high - accuracy applications, measures like low - power operation modes should be used to minimize self - heating.
How to Ensure Accuracy
- Proper Installation: Ensure correct installation and good thermal contact with the object being measured. Poor thermal contact can result in inaccurate readings.
- Use of Signal Conditioning: Signal - conditioning circuits can filter out noise and compensate for small errors, improving output - voltage accuracy.
FAQ
- Q: Can I improve the accuracy of the LM35 sensor beyond its specified values?
A: While you can't exceed the sensor's inherent accuracy limits, steps like using a stable power supply, proper installation, and signal conditioning can help approach the best - case accuracy. - Q: How does the accuracy of the LM35 compare to other temperature sensors?
A: The LM35 offers good accuracy, especially considering its low cost and ease of use. It provides a more straightforward solution with comparable or better accuracy than some thermocouples in many applications. - Q: Does the accuracy of the LM35 change over time?
A: Generally, the accuracy of a well - maintained LM35 sensor remains stable. However, long - term exposure to high temperatures or electrical stress can potentially degrade accuracy.
