How to choose the weighing sensor of electronic scale?
The electronic scale industry simply analyses how to choose the weighing sensor of the electronic scale. Today we analyze the application environment of the electronic scale .
The electronic scale industry simply analyses how to choose the weighing sensor of the electronic scale. Today we analyze the application environment of the electronic scale and the parameters of the sensor.
1. Selecting the types of weighing sensors according to the application environment of electronic scales
1. Electromagnetic field environment. Selection of Sensors with Good Anti-electromagnetic Capability and Shielding Property
2. Wet environment. Selection of Sensors with High Closure
3. High temperature environment. Select high temperature sensor, and pay attention to the application of heat insulation, water cooling or air cooling device.
4. Dusty environment. Select the sensor with high sealing ability and pay attention to the different sealing effect of different kinds of sensors with high sealing ability: welding seal < glue seal < diaphragm hot sleeve seal < vacuum nitrogen filling sensor seal
5. Corrosive environment. Select sensors with good corrosion resistance and sealing, and pay attention to the use of Over-sprayed plastic, stainless steel cover structure on the selected surface.
6. Flammable and explosive environment. Selection of Explosion-proof Sensors
Selecting the parameters or types of weighing sensors according to the parameters of sensors
1. Select according to the accuracy level of the sensor. The accuracy of the sensor can meet the matching of the input signal of the electronic scale instrument, the internal amplification circuit and the A/D conversion circuit of the electronic scale.
2. Select according to the input sensitivity of the sensor. More than or equal to the input sensitivity required by the electronic scale instrument, precisely speaking, the weighing range with the best linearity of the weighing sensor should only use 2/3 of the full range. In addition, the typical electrical sensitivity of the weighing sensor is 2 mV/V.
3. Sensor range is an important parameter for selecting sensors. Its range estimation formula is as follows:
C = K0 * K1 * K2 * K3 (Wmax + W) / N
C: Single sensor rating range
K0: Insurance coefficient, generally between 1.2 and 1.3
K1: Impact coefficient
K2: Center of gravity deviation coefficient of scale
K3: Wind Pressure Coefficient
Wmax: Maximum net weight of a weighed object
W: Weight of Weighing Body
N: Number of Support Points Used in Scales
4. Total error. Total error is generally defined as the ratio of output error to rated error. The total error of typical electronic scales is about 0.02%. Therefore, the accuracy of signal conditioning circuit, ADC resolution selection, amplification circuit design and filter design should all consider this factor.