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Sensor Application Selection Overview
Dec 21, 2017

Load cells are known in the market as the heart of an instrument. It is a device that converts a mass signal into a measurable electrical signal output. Its performance largely determines the accuracy and stability of the electronic instrument.

Load cell selection of the four elements
1, the choice of stability
The ability of a sensor to remain the same over a period of time is called stability. Factors that affect the long-term stability of the sensor in addition to its own structure, the main use of the environment. Therefore, to make sensors have good stability, we must have a strong ability to adapt to the environment. Before choosing a sensor, you should 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.
Environmental impact on the load cell will have the following effects:
1. High-temperature environment caused by the melting of the sensor coating material, solder joints, structural changes in the elastic stress.
2. open-air dust, humidity sensor short circuit caused.
3 in the corrosive environment, such as moisture, acid damage to the sensor caused by elastomer or short circuit and so on.
4. Electromagnetic field on the sensor output chaos signal.
5. Flammable, explosive environment must use a special explosion-proof sensor.
The stability of the sensor has quantitative indicators, after the expiration of life, should be re-calibrated before use to determine whether the sensor performance changes. In some applications require long-term use of the sensor can not be easily replaced or calibrated occasions, the stability of the selected sensors more stringent requirements to withstand long tests.

2, the sensitivity of choice
Usually, in the linear range of the sensor, the higher the sensitivity, the better. Because only high sensitivity, and measured the corresponding output signal value is relatively large, is conducive to signal processing. However, when the sensitivity is high, the external noise that has nothing to do with the measurement will be amplified by the amplification system to affect the measurement accuracy. Therefore, the requirements of the sensor itself should have a high signal-to-noise ratio, to minimize the interference signal introduced from the outside world.

3, the number of sensors and range of options
The choice of the number of sensors is based on the use of electronic scales, the scale body need to support the points (support points should be based on the scale body geometry center of gravity and the actual center of gravity coincidence).
The choice of sensor range can be based on the scale of the maximum weighing value, the choice of the number of sensors, scale body weight, the maximum partial load may be generated and dynamic load and other factors to determine a comprehensive evaluation. According to experience, the sensor should generally work in its 30% to 70% range, but greater impact weighing instrument, the choice of sensor, the sensor should generally be in its range of 20% to 30% in order to Ensure the safety and life of the sensor

4, the choice of accuracy
Accuracy is an important performance sensor, which is related to the measurement accuracy of the entire measurement system is an important part. The higher the accuracy of the sensor, the more expensive it is, so the accuracy of the sensor can meet the accuracy requirements of the entire measurement system without having to go too far. This allows for the selection of cheaper and simpler sensors among the many sensors that meet the same measurement goals. If the purpose of the measurement is qualitative analysis, the choice of high repeat accuracy of the sensor can not be used to select the absolute value of high precision; if it is for quantitative analysis, you must obtain accurate measurements on the selection of accuracy level to meet the requirements of the sensor weighing sensor.
Accuracy selection meets the following two conditions:
1. To meet the requirements of the instrument input. The sensor output signal must be greater than or equal to the instrument's required input signal.
2. To meet the accuracy requirements of the entire electronic scale. An electronic scale mainly by the scale body, sensors, meters composed of three parts, the choice of sensor accuracy, the sensor should be slightly higher than the theoretical accuracy of the value.

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