Temperature and humidity are closely related to people's lives, which has led to the development of sensors that integrate temperature and humidity. A temperature and humidity sensor is a device or equipment that converts temperature and humidity quantities into easily measurable and processable electrical signals. What issues should be considered when purchasing a temperature and humidity sensor? This article summarizes the following points:
I. Consider the measurement range of the temperature and humidity sensor:
Just like with any other instrument we use, we need to determine the measurement range before using a temperature and humidity sensor. Otherwise, the sensor can easily be damaged, and the measurement results will deviate significantly if the measurement is outside the range. Except for meteorological and scientific research departments, other fields do not require highly demanding temperature and humidity sensors.
II. Considering the measurement accuracy of the temperature and humidity sensor:
The measurement accuracy of a temperature and humidity sensor is the most important and effective indicator of its performance. Different working scenarios require different measurement accuracies from temperature and humidity sensors, and the required accuracy varies for each temperature and humidity level of the same object. Furthermore, cost determines price; the cost of creating temperature and humidity sensors with different measurement accuracies can vary significantly. Therefore, to better utilize temperature and humidity sensors or to save unnecessary expenses, it's best to purchase sensors that meet your actual measurement needs, rather than excessively pursuing high-precision sensors, which could lead to unnecessary problems during measurement.
III. Considering time drift and temperature drift when using temperature and humidity sensors in practical applications:
When we use temperature and humidity sensors for a period of time, due to the influence of dust, oil, and harmful gases, electronic temperature and humidity sensors will experience aging, which will lead to a decrease in their accuracy. The annual drift of electronic humidity sensors is generally around ±2%, or even higher. Typically, manufacturers will indicate that the effective usage time of a single calibration is 1 or 2 years, after which recalibration is required.
Of course, when selecting a temperature and humidity sensor, in addition to considering the points mentioned above, it is also worth noting that it is best not to use it in acidic, alkaline, or organic solvent environments. Furthermore, to accurately measure the humidity of a space, do not place the temperature and humidity sensor near walls or in areas with rough surfaces. If measuring the temperature and humidity of a relatively large space, it is best to use multiple temperature and humidity sensors together to improve the quality of the measurement data.
