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What should you pay attention to when choosing a temperature and humidity sensor, do you know?
Temperature and humidity sensors refer to equipment or devices that can convert temperature and humidity into electrical signals that can be easily measured and processed. Temperature and humidity sensors on the market generally measure temperature and relative humidity. Moreover, the temperature and humidity sensor is only one of the sensors, it just passes the temperature and humidity in the air through a certain detection device, and after measuring the temperature and humidity, according to a certain rule, it is transformed into an electrical signal or other required forms of information output for Meet user needs.
Temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. The temperature sensor is part of the temperature measuring instrument, and there are many varieties. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two types: thermal resistance and thermocouple. The technical requirements for humidity sensors are also different. From a manufacturing point of view, the same temperature and humidity sensors have different materials, structures, and processes. The performance and technical indicators (in terms of accuracy) are very different, so the price is also very different. For users, when choosing a humidity sensor, they must first figure out what kind of sensor they need; what grade of products to choose when their financial resources allow, weigh the relationship between 'needs and possibilitiesTherefore, we have to consider more complex environmental requirements for the actual application of temperature and humidity products, so there are certain requirements for the purchase of temperature and humidity sensors.
1. Consider time drift and temperature drift
In actual use, due to the influence of dust, oil and harmful gases, the electronic humidity sensor will age and the accuracy will decrease after a long time of use. The annual drift of the electronic humidity sensor is generally around ±2%. Even higher. Under normal circumstances, the manufacturer will indicate that the effective use time for one calibration is 1 or 2 years, and recalibration is required when it expires.
2. Select the measurement range
Same as measuring weight and temperature, selecting a humidity sensor must first determine the measuring range. Except for meteorological and scientific research departments, those engaged in temperature and humidity measurement and control generally do not require full humidity measurement (0-100%RH).
3. Select measurement accuracy
Measurement accuracy is an important indicator of the humidity sensor, and every increase of -%, the humidity sensor is a step up, or even the last level. Because to achieve different accuracy, the manufacturing cost varies greatly, and the selling price also varies greatly. Therefore, users must tailor their clothes, and it is not advisable to blindly pursue 'high, precise and sharp'. If the humidity sensor is used at different temperatures, the display value should also consider the influence of temperature drift. As we all know, relative humidity is a function of temperature, and temperature seriously affects the relative humidity in a given space. In most cases, if there is no precise temperature control method, or the space to be measured is not sealed, an accuracy of ±5% RH is sufficient. For local spaces that require precise control of constant temperature and humidity, or occasions where humidity changes need to be recorded at any time, choose a humidity sensor with accuracy above ±3%RH. The requirement of accuracy higher than ±2%RH may be difficult even for the standard humidity generator to calibrate the sensor, not to mention the sensor itself.
4. Other matters needing attention
The humidity sensor is non-sealed. In order to protect the accuracy and stability of the measurement, it should be avoided as far as possible in acidic, alkaline and organic solvent-containing atmospheres. Also avoid using in dusty environments. In order to accurately reflect the humidity of the space to be measured, it is also necessary to avoid placing the sensor in a dead corner too close to the wall or where the air does not circulate. If the room to be tested is too large, multiple sensors should be placed. Some humidity sensors require relatively high power supply, otherwise the measurement accuracy will be affected. Or the sensors interfere with each other or even fail to work. When in use, a suitable power supply that meets the accuracy requirements should be provided in accordance with the technical requirements. When the sensor needs to carry out long-distance signal transmission, pay attention to the attenuation of the signal. When the transmission distance exceeds 200m, it is recommended to use a humidity sensor with a frequency output signal.
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