Weighing sensor in the market is Load Cell the heart of the instrument, it is a quality signal into a measurable electrical signal output device, its performance to a large extent determine the electronic weighing accuracy and stability The
First, the choice of stability
The ability of the sensor to use for a period of time after its performance remains constant is Load Cell 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 the sensor has good stability, must have a strong ability to adapt to the environment. Before selecting a sensor, investigate the use of the environment and select the appropriate sensor according to the specific use environment, or take appropriate measures to reduce the environmental impact.
The environmental counterweight sensor can have the following effects:
1. High temperature environment caused by the melting of the coating material of the sensor, the opening of the solder joint, the elastic body structure changes.
2. Open dust, moisture on the short circuit caused by the impact of the sensor.
3. In corrosive environment, such as moisture, acid damage to the sensor caused by elastic or short circuit caused by the impact.
4. Effect of electromagnetic field on sensor output disorder signal.
5. Flammable, explosive environment must use a special explosion-proof sensor.
The stability of the sensor has a quantitative indicator, after more than the use of the period, should be re-calibrated before use to determine whether the performance of the sensor changes. In some applications where the sensor can be used for a long time and can not be easily replaced or calibrated, the stability of the selected sensor is more stringent and can withstand long periods of time.
Second, the choice of sensitivity
In general, within the linear range of the sensor, it is desirable that the higher the sensitivity, the better. Because only the sensitivity is high, and the measured output signal value is relatively large, is conducive to signal processing. But the sensitivity is high, and the measurement has nothing to do outside the noise amplification system will be enlarged, affecting the measurement accuracy. Therefore, the sensor itself should be required to have a high signal to noise ratio, to minimize the interference signal from the outside world.
Third, the choice of the number of sensors and range
The choice of the number of sensors is based on the use of electronic weighing instruments, scale body need to support the number of points (support points should be based on the geometric center of gravity and the actual center of gravity and the principle of the center of gravity).
The choice of the sensor range can be determined according to the maximum weighing value of the scale, the number of sensors, the weight of the scale body, the possible maximum load and dynamic load. According to experience, the sensor should generally work in its 30% to 70% of the range, but a greater impact of the scale of the instrument, the choice of sensors, the sensor should generally work in its range of 20% to 30% To ensure the safety and life of the sensor