First, the stability of choice
After a period of use, the ability of the sensor's attributes remains unchanged and known stability. The long-term stability of the impact sensor depends on its own structure and the environment in which it is used. Therefore, in order to make the sensor have good stability, it must have a strong ability to adapt to the environment. Before choosing sensors, the investigation should use the environment, and select the appropriate sensors according to the specific use environment, or take appropriate measures to reduce the impact on the environment.
Environmental pressure transmitters have the following effects:
High temperature environmental sensor coating material melting, weld civilization, elastomer stress structure changes.
Dust in open air and short circuit caused by humidity sensor.
Damage or short-circuit elastomers caused by sensors in higher corrosion environments such as humidity and acidity.
The disturbance of the electromagnetic field to the output signal of the sensor.
Special explosion-proof sensors must be used in flammable and explosive environments.
Quantitative indicators of the stability of the sensor in use should be recalibrated to determine whether the performance of the sensor changes. In the long-term use, can not be easily replaced or calibrated occasions, the selected sensor stability requirements are more stringent, to be able to withstand the test of the extension of the sensor has certain requirements.
Second: Sensitivity of Selection
Usually, within the linear range of the sensor, the higher the sensitivity, the better. Because only the sensitivity is high, the measurement of the corresponding output signal value is relatively large, which is conducive to signal processing. Independent external noise will be amplified by the amplification system, which will affect the measurement accuracy and high sensitivity.
Third: Selection of the number and scope of sensors
The number of sensors is determined by the number of support points needed by the body of the electronic scale (in principle, it should be determined by the geometric center of gravity of the support points and the actual center of gravity of the weight of the scale).
Maximum scale Load cells, weighing scales, the most possible part of the load and dynamic load factors are evaluated to determine the number of selection can be based on the sensor range. Generally, it should be based on the working experience of sensors in the range of 30% to 70%, but there is a larger choice of impact Load cells. Generally, in the range of 20% to 30%, the sensor should work to ensure the safe use of sensors and life.
Finally: Choosing Accuracy
Accuracy is an important performance index of sensor, which is related to an important part of the measurement accuracy of the whole measurement system. The higher the accuracy of the sensor, the more expensive it is. So as long as you can meet the accuracy requirements of the whole measurement system, don't choose the sensor. So you can choose cheaper and simpler sensors in many sensors to meet the same measurement purpose. If the result of measurement is analyzed qualitatively, the sensor with high repetition accuracy should be selected. The absolute magnitude with high accuracy should not be used. If quantitative analysis is carried out, it is necessary to obtain accurate measurement results and select the sensor pressure transmitter with the required accuracy.
Accuracy selection to meet the following two conditions:
It meets the requirement of instrument input. The output signal of the sensor must be the input signal required by the instrument greater than or equal to.
It meets the accuracy requirement of the whole electronic scale. The accuracy of the sensor is slightly higher than the theoretical value.
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