Level detection and monitoring has been playing an important role in the automated production process, and the impact of level monitoring on product quality is also conceivable. Because of the complexity and variability of the level detection environment, it also brings different challenges to the application of sensors. Now Atech talks about how to select the level sensor to ensure the smooth production process.
1. Determine the type of sensor according to the measuring object and the measuring environment.
To carry out a specific measurement work, first of all, we should consider the principle of the liquid level sensor, which needs to analyze many factors before we can determine. Because, even if the same physical quantity is measured, there are many kinds of sensors that can be selected. Which kind of sensor is more suitable, we need to consider the following specific issues according to the characteristics of the measurement and the conditions of the use of the sensor: the size of the measurement range; the volume requirement of the measured position for the sensor; the measurement method is contact or non-contact; the method of signal extraction, wired or non-contact. Non-contact measurement; sensor source, imported or domestic, price acceptable, or self-developed.
2. Selection of Sensitivity
Usually, in the linear range of the liquid level sensor, the higher the sensitivity of the sensor, the better, because only when the sensitivity is high, the output signal corresponding to the change of the measured value will be more conducive to signal processing, but it should be noted that the sensitivity of the sensor is high, and the external noise unrelated to the measured value is easy to mix in, and will also be amplified by the amplification system, affecting the measurement accuracy. This requires that the sensor itself has a high signal-to-noise ratio and minimizes the factory distress signal introduced from the outside world. The sensitivity of the sensor is directional. When the measured value is a single vector and the directivity of the sensor is high, the sensor with low sensitivity in other directions should be selected. If the measured value is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor is required.
3. Frequency Response Characteristics
The frequency response characteristic of the liquid level sensor determines the frequency range of the measured signal. It is necessary to keep the measurement condition undistorted in the allowable frequency range. In fact, the response of the sensor always has a certain delay. It is hoped that the shorter the delay, the better the frequency response of the sensor, the wider the frequency range of the signal that can be measured. Because of the influence of the structural characteristics, the inertia of the mechanical system is larger. Because the frequency of the measurable signal of the sensor with low frequency is low, in dynamic measurement, the response characteristics (steady state, random, etc.) of the signal should be taken into account in order to avoid the error of overfire.
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