Describe the four selection of weighing sensor elements

Weighing sensor is a quality signal into electrical signal output device can be measured, its effective performance to a large extent determines the precision and stability of the electronic weighing apparatus, so called the heart of the weighing apparatus. Next, listen to the weighing sensor manufacturers engineer about their product selection of four elements: a, in general, the choice of sensitivity in sensor linear range, sensitivity, of course, the higher the better. Because only in the case of high sensitivity, corresponding to the measured values of the output signal is larger, more conducive to signal processing. But when the sensitivity is higher, has nothing to do with measuring the external noise will be amplified system amplifier, affect measurement accuracy. Sensor itself, therefore, should have high signal-to-noise ratio, can reduce the introduction of jamming signal. Second, the choice of precision accuracy is an important performance index of the sensor, is about the whole measurement system measuring accuracy is important one annulus. The higher the precision of the sensor, the higher the cost. Therefore, the precision of the sensor can only meet the requirements of the precision of measuring system, instead of having to choose is too high. In this way, can satisfy the numerous sensors of the same measurement purposes to choose cheaper, simpler sensors. If the purpose of measurement is the qualitative analysis, can choose to repeat high precision sensor, should not choose the absolute value of high precision. If it is quantitative analysis, it is necessary to get the accurate measured value, and select the level of accuracy can meet the requirements of the sensor. Weighing sensor manufacturers engineer said: the choice of precision need to satisfy the following two conditions: 1, the instrument input requirements. Sensor output signal must be greater than or equal to the equipment requirements of the input signal. 2, to meet the accuracy requirement of electronic balance. Electronic scale is mainly composed of, sensors and instruments of three parts. When choosing the sensor precision, the accuracy of the temperature sensor shall be slightly higher than the theoretical calculation precision. Three, choice of the stability of the sensor in after a period of time to maintain its performance and stability of the same ability is called. In addition to its structure, main factors influencing the long-term stability of the sensor is the use of the environment. Therefore, to make the sensor has good stability, and will need to have very strong environment adaptability. Before the selection of sensors, should investigate the use environment, and according to the specific use environment to choose the appropriate sensor, or take appropriate measures to reduce the influence of natural environment. Environmental symmetric weight sensor will produce the following: 1, the environment of high temperature lead to melt coating material, solder joint opening and elastomer stress structure change. 2, dust and humidity sensor short-circuit impact. 3, in damp, acid and other corrosive environment, the sensor will be damaged or short circuit. 4, the influence of the electromagnetic field of sensor output interference signals. 5, in the inflammable and explosive environment, must choose special explosion-proof sensor. The stability of the sensor has a quantitative indicators. After more than life, before the use should recalibrate, to determine whether the sensor performance changes. In some sensors need to use for a long time, not easy to replace or calibration, the stability of the selected sensors more strictly, can endure the test of time. Four, sensor number and scope of the number of sensor selection is based on the usage of electronic weighing apparatus and weighing the required points ( Support points should be needed for the weighing body according to its geometry center overlapping principle to determine the actual center of gravity and weighing body) 。 Sensors could be selected through comprehensive evaluation scale range of maximum load value, choose the number of sensor, the weight of the balance of body, possible maximum offset load and dynamic load factor to determine. According to experience, - Under normal circumstances, the sensor should be in the range of 30% 70% within the scope of work, but choosing sensor, big impact of weighing apparatus should be in the range of 20% 30% within the scope of work, to ensure the safety and service life of the sensor.
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