Human survival and social activities are closely related to humidity. With the realization of modernization, it is difficult to find a field that has nothing to do with humidity. Due to different application fields, the technical requirements for humidity sensors are also different. From the manufacturing point of view, the same humidity sensor, material, structure is different, the process is different. Its performance and technical indicators will be very different, so the price is also very different. For the user, when choosing a humidity sensor, first of all, it is necessary to find out what kind of humidity sensor is needed; what kind of product is allowed by the financial resources of its own, and weigh the relationship between “need and possible†and not blindly act. From the interaction with users, we feel that the following issues are worth noting.
1. Select the measurement range and measure the weight and temperature. Select the humidity sensor first to determine the measurement range. In addition to meteorological and scientific research departments, temperature and humidity measurement and control generally do not require full wet range (0-100% RH) measurement. In today's information age, sensor technology is closely integrated with computer technology and automatic control. The purpose of the measurement is to control, the measurement range and the control range are collectively used. Of course, for those who do not need to engage in measurement and control systems, it is ok to directly select a universal hygrometer. The following is a list of the different requirements for the temperature and humidity of the humidity sensor in some application areas for the user's reference (see Table 1). The user proposes the measurement range to the sensor manufacturer according to the needs. The manufacturer gives priority to ensuring that the performance of the sensor is consistent and consistent within the scope of use, and obtaining a reasonable performance-price ratio is a mutually beneficial thing for both parties.
2. The measurement accuracy is the same as the measurement range. The measurement accuracy is the most important indicator of the sensor. Every increase is a percentage point. For the sensor, it is the last step, even the previous level. Because of the different precisions, the manufacturing costs vary greatly, and the selling price is far from the same. For example, an imported low-cost humidity sensor is only a few dollars, and a full-wet humidity sensor for calibration is a few hundred dollars, a difference of nearly a hundred times. Therefore, users must tailor their clothes, and they should not blindly pursue "high, precise, and sharp." Manufacturers often give the accuracy of their humidity sensors in sections. For example, the medium and low temperature sections (0-80% RH) are ±2% RH, while the high-humidity section (80-100% RH) is ±4% RH. And this accuracy is the value at a given temperature (eg 25 ° C). For example, use a humidity sensor at different temperatures. The indications also take into account the effects of temperature drift. It is well known that relative humidity is a function of temperature, which severely affects the relative humidity within a given space. The temperature changes by 0.1 °C. A humidity change (error) of 0.5% RH will be produced. In the case of use, if it is difficult to achieve constant temperature, it is not appropriate to propose excessive humidity measurement accuracy. Because the humidity is also erratic with temperature changes, the luxury measurement accuracy will lose its practical significance. Therefore, the first thing to control the humidity is to control the temperature. This is why a large number of applications are often temperature and humidity-body sensors rather than just humidity sensors.
In most cases, the accuracy of ±5% RH is sufficient if there is no precise temperature control or if the measured space is unsealed. For areas requiring precise control of constant temperature and constant humidity, or where it is necessary to track and record humidity changes at any time, select a humidity sensor with an accuracy of ±3% RH or more. Corresponding temperature sensor. The temperature measurement accuracy must be above ±0.3 °C, at least ±0.5 °C. The requirement that the accuracy is higher than ±2% RH may be difficult to achieve even the standard humidity generator of the calibration sensor, not to mention the sensor itself. According to the article of the National Standards Substance Research Center humidity chamber, "relative humidity measuring instruments, even at 20-25 ° C, it is still difficult to achieve 2% RH accuracy."
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