okplazas.com exclusive sharing Pepperl+Fuchs sensor selection 6 factors!

Today, Pepperl+Fuchs sensors in the Asian industrial market have become the first choice for the same application environment; however, there are many times when customers are eager to use Pepperl+Fuchs sensors, but they don’t know the model of the sensor or the relevant parameters of the required sensor. At this time, you How will you choose the Pepperl+Fuchs sensor you want to buy? As a professional automation service company for ten years-okplazas.com will simply share this with you for your reference only. If there are any supplements, I hope you can provide valuable comments!

Pepperl+Fuchs Sensor

What are the principles of P+F sensor selection?

　Modern sensors are very different in principle and structure. How to select the sensor reasonably according to the specific measurement purpose, measurement object and measurement environment is the first problem to be solved when measuring a certain quantity. When the sensor is determined, the measuring method and measuring equipment that match it can also be determined. The success or failure of the measurement result depends to a large extent on whether the selection of the sensor is reasonable.

　The selection of Pepperl+Fuchs sensor is based on 6 related factors.

　According to the measurement object and measurement environment to determine the type of sensor

　To carry out a specific measurement work, we must first consider what kind of sensor principle is used, which can only be determined after analyzing many factors. Because even if it is measuring the same physical quantity, there are sensors with multiple principles to choose from. Which principle sensor is more suitable, you need to consider the following specific issues according to the characteristics of the measured and the use conditions of the sensor: the size of the range; The requirements of the measured position on the sensor volume; whether the measurement method is contact or non-contact; the signal extraction method, wired or non-contact measurement; the source of the sensor, whether the price can be affordable, or self-developed.

After considering the above issues, we can determine which type of sensor to choose, and then consider the specific performance indicators of the sensor.

　 2. The choice of sensitivity

　 Generally, within the linear range of the sensor, it is hoped that the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing. But it should be noted that the sensitivity of the sensor is high, and external noise that has nothing to do with the measurement is also easy to mix in, and it will also be amplified by the amplification system, affecting the measurement accuracy. Therefore, it is required that the sensor itself should have a higher signal-to-noise ratio, and try to reduce the factory disturbance signal introduced from the outside.

The sensitivity of the sensor is directional. When the measured is a single vector, and its directivity requirements are high, the sensor with less sensitivity in other directions should be selected; if the measured is a multi-dimensional vector, the smaller the cross sensitivity of the sensor, the better.

　3, frequency response characteristics

　The frequency response characteristic of the sensor determines the frequency range to be measured, and the measurement conditions must be kept undistorted within the allowable frequency range. In fact, the response of the sensor always has a fixed delay, and it is hoped that the delay time is as short as possible. The frequency response of the sensor is high, the signal frequency range that can be measured is wide, and due to the influence of structural characteristics, the inertia of the mechanical system is larger, and the frequency of the measurable signal is lower due to the low frequency sensor. In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient state, random, etc.) to avoid over-fire errors.

　4, linear range

　The linear range of the sensor refers to the range where the output is proportional to the input. In theory, the sensitivity remains constant within this range. The wider the linear range of the sensor, the larger the measuring range, and a certain measurement accuracy can be guaranteed. When selecting a sensor, when the type of sensor is determined, it is first necessary to see whether its range meets the requirements. But in fact, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, the sensor with less nonlinear error can be approximately regarded as linear, which will bring great convenience to the measurement.

5. Stability

　The ability of the sensor to keep its performance unchanged after a period of use is called stability. In addition to the structure of the sensor itself, the factors that affect the long-term stability of the sensor are mainly the use environment of the sensor. Therefore, in order for the sensor to have good stability, the sensor must have strong environmental adaptability. Before selecting a sensor, investigate its use environment, and select the appropriate sensor according to the specific use environment, or take appropriate measures to reduce the impact of the environment. The stability of the sensor has a quantitative index. After the period of use has expired, it should be re-calibrated before use to determine whether the performance of the sensor has changed. In some occasions that require the sensor to be used for a long time but cannot be easily replaced or calibrated, the stability of the selected sensor is more stringent and must be able to withstand the test for a long time.

　6, accuracy

　Precision is an important performance index of the sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select too high. In this way, a cheaper and simpler sensor can be selected among many sensors that meet the same measurement purpose.

　 If the measurement purpose is for qualitative analysis, select a sensor with high repeatability accuracy. It is not advisable to use a sensor with high absolute value accuracy; if it is for quantitative analysis, accurate measurement values ​​must be obtained, and a sensor with an accuracy level that can meet the requirements should be selected. For some special applications, if you can't choose a suitable sensor, you need to design and manufacture the sensor by yourself. The performance of the self-made sensor should meet the requirements of use. 　 I hope that the above reference factors for P+F selection will be of some help to you in your future work. At the same time, I also hope that you will analyze and discuss the problems encountered in your work more with the industry in your future work.