A gas sensor is a converter that converts the volume fraction of a gas into an electrical signal. When we use gas sensors, we will inevitably encounter some problems, in this regard, we have made the following analysis:
1. How long does it take for the gas sensor to be recalibrated after use: The time interval between starting calibration and recalibration depends on many factors, usually including the operating temperature, humidity, pressure, what kind of gas the sensor is exposed to, and the length of time it is exposed to the gas.
However, most products can provide a very stable signal for a long period of time, and the use of gas sensors only requires regular calibration, such as once a year. If the use of the sensor is extremely demanding or for safe use, the calibration work may be relatively frequent.
2. What happens when the temperature of the gas itself is different from the temperature of the sensor: The temperature of the sensor itself determines its minimum display current, and the temperature of the measured gas sample has a certain influence on this. The rate at which gas molecules pass through the pores and enter the sensing electrode determines the sensor's signal.
If the temperature of the diffused gas passing through the pores is different from the temperature of the gas inside the sensor, the sensitivity of the sensor may be affected. At the end of the device, there may be a slight drift or a transient change in current.
3. Whether the gas sensor can be continuously exposed to the target gas: The gas sensor can monitor the target gas intermittently, which is generally not suitable for continuous monitoring, especially when it involves high gas concentration, high humidity or high temperature.
In order to achieve the intent of continuous monitoring, it is sometimes possible to cycle two (or even three) sensors, so that each sensor is exposed to the gas at most at the moment of folding, and the other half of the time is healed in the fresh air.
The gas sensor will be developed on the basis of making full use of multidisciplinary comprehensive skills such as micromechanical and microelectronic skills, computer skills, signal processing skills, sensing skills, fault diagnosis skills, and intelligence skills. The development of fully automatic digital intelligent gas sensors that can monitor multiple gases together will be an important research direction in this field.
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