Temperature and humidity sensor is one of the many sensors. After measuring the temperature and humidity in the air through some kind of detecting device, it will be converted into electrical signals or other required forms of information output according to a certain law to meet the needs of users.
Since temperature and humidity are closely related to physical quantities themselves as well as to real-life temperature and humidity, there are many types of sensors that combine temperature and humidity. Temperature and humidity sensors are devices or equipment that convert temperature and humidity into electrical signals that can be easily detected and disposed of.
Linear Range
The linear range of a temperature and humidity sensor is the range in which the input is proportional to the output. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the wider its range and ensure a certain measurement accuracy. When selecting a sensor, the first thing to look at is its range and whether it meets the requirements.
Determining the sensor type according to the measurement object and the measurement environment
To carry out a specific measurement, the first thing to consider what principle of temperature and humidity sensor, which needs to be analyzed after a number of factors to determine. Because, even if the measurement of the same physical quantity, there are a variety of principles of the sensor can be selected, which principle of the sensor is more appropriate.
Selection of Sensitivity
Generally speaking, within the linear range of the temperature and humidity sensor, the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the output signal value matching the measurement change is relatively large, which helps signal processing. However, it should be noted that the sensor sensitivity is high, and the measurement of external noise is also easy to mix, will also be amplified by the amplification system, affecting the measurement accuracy. Therefore, it is recommended that the sensor itself has a high signal-to-noise ratio, and as far as possible to reduce the introduction of interference signals from the outside world.
Stability
The ability of a temperature and humidity sensor to remain unchanged in its performance after a period of use is called stability. In addition to the structure of the sensor itself, the main factor affecting the long-term stability of the sensor is the sensor's use of the environment. Before selecting the sensor, the use of the environment should be investigated, according to the specific use of the environment to select the appropriate sensor, or to take appropriate measures to reduce the environmental impact. The stability of the sensor has quantitative indicators. After exceeding the service life, should be used before the calibration should be carried out again to determine the performance of the sensor with or without changes.
Temperature and humidity sensor selection recommendations
1.Cost-effective. In the selection of temperature and humidity transmitter should choose the cost-effective products, rather than choosing the low price of the product. If you only focus on the price, then in the use of life, maintenance, inspection problems, which will also greatly increase the cost.
2. Quality and Reliability. It is also necessary to judge the product by examining the manufacturer's standards of appearance and quality certification; you can also determine the reliability of the product through the temperature and humidity sensor manufacturer visibility, brand, reputation and other comprehensive factors.
3.Adaptability. When choosing a transmitter should be combined with their actual situation, the use of environmental occasions to determine which product to choose in the end. Need to fully consider the adaptability factor.
4. Maintenance. Temperature and humidity sensors need to be regularly inspected, updated, replaced and repaired.
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