1Select measurement range
As with measuring weight and temperature, the first choice for a humidity sensor is to determine the measurement range. In addition to the meteorological and scientific research departments, the measurement of temperature and humidity usually does not require full-humidity (0-100% RH) measurements.
2 Select measurement accuracy
The accuracy of the measurement is the most important indicator of the humidity sensor. Every ‧ percentage points we increase, it is a new level for the humidity sensor, even on a grade. Because we have to achieve different precisions, the manufacturing costs are very different and the prices are very different. Therefore, the user must tailor the sensor, it is not suitable to blindly pursue "high, refined, sharp." If humidity sensors are used at different temperatures, their indications also need to consider the effect of temperature drift. As we all know, relative humidity is a function of temperature, and the temperature seriously affects the relative humidity in a given space. Each temperature changes by 0.1°C. A humidity change (error) of 0.5% RH will be generated. If it is difficult to use a constant temperature in the occasion of use, it is not suitable to propose excessively high humidity measurement accuracy. In most cases, the accuracy of ±5% RH is sufficient if there is no accurate temperature control method or if the space under test is unsealed. For those applications that require precise control of constant temperature, humidity, or humidity, or need to track and record changes in humidity at any time, use a humidity sensor with an accuracy of ±3% RH or more. Accuracy higher than ±2% RH is not even a standard humidity generator for calibration sensors, let alone the sensor itself. Relative humidity measuring instruments, even at 20-25 °C, to achieve 2% RH accuracy is still very difficult. The characteristics given in the general product literature are measured at room temperature (20 °C ± 10 °C) and clean gas.
3 consider the 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 due to a long use time. The annual drift of the electronic humidity sensor is generally about ±2%, even more. high. Under normal circumstances, the manufacturer will indicate that the effective use time of one calibration is one year or two years, and the calibration must be re-calibrated.
4 Other considerations
Humidity sensors are non-hermetic, and in order to protect the accuracy of measurement and stability, we should try to avoid the use of acidic, alkaline and organic solvent-containing atmosphere. Also avoid using in dusty environments. In order to correctly reflect the humidity of the space to be measured, it is also necessary to avoid placing the sensor too close to the wall or in a corner where air does not flow. If the room being measured is too large, multiple sensors should be placed. Some humidity sensors require higher power supply, otherwise it will affect the measurement accuracy. Or the sensors can interfere with each other and they can't even work. When used, provide suitable power supply that meets the accuracy requirements according to technical requirements. When the sensor needs to carry out long-distance signal transmission, it is necessary to pay attention to signal attenuation. When the transmission distance exceeds 200m, it is recommended to use the humidity sensor of the frequency output signal.
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