Choice of temperature and humidity sensor problem before please note the followi
Human survival and social activities are closely related with the humidity. With modernization, it is difficult to find a field unrelated to humidity. Since different applications, on the humidity Sensor The technical requirements are also different. From the manufacturing point of view, the same humidity Sensor , Materials, structure, a process different. The performance and technical indicators are very different, so prices are very different. Users, the choice humidity sensor, the first to find out what kind of sensor; their finances allow buy what grade products, good balance "needs to be" relationship and he will not act blindly. We travel with the user in question is worth noting that in the following.
1. Select measuring range and measuring weight, temperature is the same, select the humidity sensor must first determine the measuring range. In addition to meteorological and scientific research departments, engaging in temperature and humidity monitoring in general do not need all wet process (0-100% RH) measurements. In today's information age, sensor technology and computer technology, automatic control technique closely with Zhu. The purpose of measurement control, measurement and control together, the scope of usage. Of course, the application does not require those who engage in monitoring and control system for direct selection Universal humidity instrument on it. Here are a number of applications of the humidity sensor temperature, humidity, different requirements for users (see Table 1). Users required to make sensor measurement range of production plant, production plant priority to ensuring the user to use the sensor performance is stable within the same reasonable cost performance obtained by the two sides is a complementary thing.
2, select the same precision and measurement range, measurement accuracy is the sensor with the most important indicator. Each increase? Percentage points. On the sensor it is a step, or even a grade. Because to a different precision, the manufacturing costs vary greatly, are quite different prices. For example, a low-cost imports of only a few dollars a humidity sensor, and an only calibration process used in all wet humidity sensor to a few hundred dollars, a difference of nearly a hundredfold. Therefore, users have to tailor, not the blind pursuit of "high, fine, sharp." Manufacturers often give their moisture sensor section accuracy. Such as in low temperature (0 to 80% RH) to ± 2% RH, the humidity in paragraph (80? 100% RH) to ± 4% RH. And the accuracy is at a specified temperature (eg 25 ) value. If used under different temperature and humidity sensors. The indication should also consider the impact of temperature drift. As we all know, the relative humidity is a function of temperature, the temperature seriously affects the relative humidity within the specified space. Each change in temperature 0.1 . Will produce 0.5% RH of humidity change (error). Use if the temperature is difficult to do, suggests that the high measuring precision is not appropriate. Because the humidity is also drift with temperature suddenly uncertain, then talk about measuring precision would lose practical significance. Therefore, we must first control the wet well-controlled temperature, which is often a large number of applications, temperature and humidity? Body of sensor is a humidity sensor instead of a simple reason.
Most cases, if there are no precise temperature control means, or measured non-sealed space, ± 5% RH accuracy is sufficient. Demands precise control for constant temperature and humidity of the local space, or need to keep track of humidity of the occasion, and then choose more than ± 3% RH accuracy of the humidity sensor. Correspondingly, the temperature sensor. The temperature measurement accuracy of ± 0.3 to meet the above minimum is ± 0.5 for. The higher than ± 2% RH accuracy requirements but even the standard humidity generator calibrated sensor is difficult to achieve, not to mention the sensor itself. National Research Centre, room humidity, the article said: "The relative humidity measuring instruments, even in the 20? 25 , in order to reach 2% RH accuracy is still very difficult."
3, considering the drift and the drift Almost all of the sensors
the presence of drift and drift. As the humidity sensor must be in contact with atmospheric water vapor, it can not seal. This determines its stability and longevity is limited. In general, manufacturers would indicate a time calibration of the effective use of time for 1 or 2 years, due for re-calibration. Please consider the user in the choice of sensor re-calibration of the channels better in the future, do not seek foreign goods cheaper, or superstition, the neglect of after-sales service are asked.
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