Are Digital Weighing Scales Accurate?

Introduction

Electronic scales are a kind of weighing apparatus, which is a tool to measure the quality of objects by using the lever balance principle of Hooker's law or force. According to the principle of structure can be divided into mechanical scales, electronic scales, electromechanical combination scales three categories. 

Influencing Factor

It’s mainly influenced by the environmental factor. 

1.Temperature and Humidity: Ambient temperature, temperature changes will lead to a large error in the weight inspection scale, or even can not be used. Direct sunlight will also lead to a large change in the local temperature of the weighing scale, resulting in a large error. 

2.Static Induction and Electromagnetic Interference: Connect the ground wire. With high-power equipment, large frequency converter and other equipment supply system to separate.

3.Air and Ground Motion: Weighing scales can not be installed in the window, vents, fan mouth, air conditioning entrances and other places where the airflow changes greatly. The ground strength is not enough, people walking or other equipment operation will produce vibration, affecting the accuracy. Installed on the aisle, often people or forklifts and other equipment passing by.

4.Dust, Corrosive Gas, Corrosive Liquid Splashing on the Device: Dust is large, stacked on the scale table, will affect the accuracy, stacked on the back of the belt, will accelerate the wear of the belt, roller. Wear of the tube. 

How to Adjust

1.Before commissioning, first find enough open flat and strong concrete ground, the electronic scale sensor installed to the support level, and then the electronic scale adjustment assembly neatly.

2.If it is a single-section electronic scale, as long as the sensor is installed, the multi-section electronic scale should be connected at the connection, and adjust the sections in a horizontal line.

3.When debugging, the four corners of the sensor should be leveled. The technician of Kelida will measure the signal voltage of the sensor with a 200mv voltage file of the multimeter. The normal voltage is about 0.7mv. The four corner voltages are basically the same, indicating that the four corners are flat, and the two corner voltages are small. It means that the angle is too small and the gasket needs to be raised. After the four corners are leveled, the weight is checked by the weight to ensure the accuracy of the scale and whether the zero return is normal.

4.Two or three large-tonnage electronic scales, the middle two corners or four corners are about twice as strong as the two heads. In terms of signal voltage, the signal voltage of the two sensors is ≤ 1/2 of the middle voltage.

5.When corner angle adjustment, try to press the angle with 4T or more weight. The electronic scale sensor and junction box should be connected in the correct order to facilitate subsequent debugging and maintenance. If necessary, mark in the junction box.