WANT Balance Instrument Co., Ltd.

With the development of technology, more and more precise electronic balances have emerged in the field of weighing, and digital balances are among the best. Digital balances are widely used in various fields, from sales point terminals to industrial measuring equipment. But many people only know a little about it, this article will introduce you to what is digital balance and how does a digital balance work.

what is digital balance

Definition and Composition of Digital Balance

A digital balance is an instrument used for accurately measuring the weight of an object. It converts the weight of an object into a digital signal through electronic sensors and displays it on a digital display screen. Compared with traditional mechanical scales, digital scales provide higher measurement accuracy and reading convenience.

The digital balance mainly consists of the following parts:

Scale pan: mostly made of metal materials, installed on the sensor of the balance, is a load-bearing device for weighing, mostly in circular and square shapes. During use, attention should be paid to hygiene and cleanliness, and replacement is not allowed at will.

Sensor: It is one of the key components, consisting of a housing, magnetic steel, pole shoes, and coils, and is installed under the scale pan. It has high accuracy and strong sensitivity, and the weighing room of the balance should be kept clean to avoid affecting the normal operation of the sensor.

Position detector: composed of highly sensitive far-infrared light-emitting tubes and symmetrical photosensitive cells, its function is to convert the load on the scale into an electrical signal output.

In addition, the digital balance consists of components such as PID regulator, power amplifier, low-pass filter, analog-to-digital (A/D) converter, microcomputer, display, chassis, and feet. These components work together to ensure that the digital balance can accurately and quickly weigh objects and display the results clearly. The various components of a digital balance work together to provide users with high-precision and reliable weighing solutions.

how does a digital balance work

The Digital balance works on the laws of Electromagnetic Force Balance. The balance is in its initial equilibrium state when the weighing plate has no load. The position of induction coil in the electromagnetic force balance sensor is now fixed. Similarly intensity with which light falls on photosensitive transistor in photoelectric sensor also has a fix value at this point output current too have specific values corresponding to it.

When the weighing plate is loaded with the object being weighed, the balance is in an unbalanced state. Under the gravitational force of the object being weighed, the weighing plate and the electrically charged coil inside move downwards in the magnetic field. This movement will trigger the photosensitive transistor in the photoelectric sensor to detect changes in the light signal, resulting in a change in its output current. After microfabrication, this current change is used to control the current magnitude of the electromagnetic coil.

The current of the electromagnetic coil changes, so that an electromagnetic force is generated opposite to the direction of gravity relative to measured object and as a result weighing plate moves up. At this stage the balance balances when electromagnetic force and gravity are equal. In this case, the microprocessor reads the amplitude of current change in an electro-magnetic coil via a digital signal which it then translates within milliseconds as mass value shown on its screen.

For example, in practical applications, a 0.1mg digital balance can accurately measure the mass of small objects through the above working principle. When an object with a mass of 5g is placed on a weighing plate, the photoelectric sensor detects a change in the light signal and the output current changes. After micro processing, the current of the electromagnetic coil is controlled to increase, and the generated electromagnetic force gradually increases until it is equal to the gravity of the object. At this point, the display screen shows a value of 5.000g.

In short, digital balances utilize the principle of electromagnetic force balance and, through precise sensors and microprocessing technology, can accurately and quickly measure the mass of objects, providing reliable weighing tools for scientific research and production practices in various fields.If you need high-quality and accurate digital scales, WANT is your best choice, WANT is specialized in developing, manufacturing, selling electronic balances, which owns abundant technology,and independent research department. The level of our technology takes the lead in Chinese balance indusrty.