Comprehensive Analysis of The Working Principle of Weighing Indicator

In modern industrial automated production, Weighing Indicator plays a vital role. Whether it is food processing, chemical production, logistics warehousing or pharmaceutical industry, accurate weight measurement and control are inseparable from this core equipment. This article will explain the working principle of Weighing Indicator in simple terms to help you understand how it can achieve high-precision measurement and automatic control.

What is a Weighing Indicator?

A Weighing Indicator is an electronic device specially designed to receive, process and output weight signals. It is usually used in conjunction with a load cell to convert the weak electrical signal detected by the sensor into a readable digital weight value, and perform control operations according to preset parameters, such as alarm, sorting, filling or batch control.

As the "brain" of the industrial weighing system, the Weighing Indicator not only provides weight display function, but also can be linked with other devices through relays, analog output or communication interfaces (such as RS485, Ethernet) to achieve a fully automated production process.

Core components of Weighing Indicator

To understand how Weighing Indicator works, we first need to understand its main components:

Signal input module

Receives millivolt-level electrical signals from weighing sensors (usually 0-20mV or 0-30mV)

Contains high-precision amplifiers to amplify weak signals to a processable range

Analog-to-digital converter (ADC)

Converts the amplified analog signal into a digital signal

Determines the resolution and accuracy of the system (common 16-24-bit ADC)

Microprocessor unit

Runs dedicated algorithms to process weight data

Implements calculation functions such as filtering, peeling, and accumulation

Display and operation interface

LCD or LED display shows real-time weight

Buttons or touch screen for parameter setting

Output control module

Relay output for switch control

Analog output (4-20mA/0-10V) connects to PLC system

Digital communication interface (such as Modbus) for system integration

Power module

Provides stable power for controller and components

Usually supports wide voltage input (such as AC 85-265V or DC 24V)

Detailed explanation of the working principle of the Weighing Indicator

Step 1: Weight signal acquisition

When an object is placed on the weighing platform, the mechanical force is converted into an electrical signal through the weighing sensor. A typical strain sensor will produce a mV voltage change proportional to the pressure. This weak signal is transmitted to the signal input terminal of the Weighing Indicator through a shielded cable.

Step 2: Signal conditioning and amplification

The original signal often contains noise interference (such as electromagnetic interference or vibration). The controller's preamplifier not only amplifies the signal hundreds of times, but also eliminates high-frequency noise through the filtering circuit to ensure the signal is pure. High-end controllers will use multiple filtering technologies, including:

Hardware RC filtering

Digital moving average filtering

Adaptive filtering algorithm

Step 3: Analog-to-digital conversion

The amplified analog signal enters the high-precision ADC chip. Taking a 24-bit ADC as an example, it can divide the full-scale signal into 2^24 (about 16 million) discrete steps to achieve extremely high resolution. The conversion speed is usually between 10-100 times/second, and high-speed applications can reach more than 1000Hz.

Step 4: Digital processing and calculation

The microprocessor performs a series of processing on the digital signal:

Zero point calibration: automatic or manual deduction of tare weight

Linearization processing: compensation for nonlinear errors of sensors

Unit conversion: convert the original value to common units such as kg and lb according to the settings

Dynamic compensation: real-time correction for fluctuations caused by vibration or material flow

Step 5: Control logic execution

According to the preset parameters, the controller performs corresponding actions:

Simple control: trigger the relay when the target weight is reached (such as filling valve closing)

PID control: predict the advance amount through the algorithm to achieve high-speed and accurate filling

Batch accumulation: total statistics of multi-bucket weighing system

Weighting sorting: linkage with sorting equipment to eliminate unqualified products

Step 6: Data output and communication

The processing results are output in a variety of ways:

Local display: real-time weight, status indication

Remote monitoring: upload to SCADA system through industrial protocol

Data recording: store historical weighing data for traceability

Application scenarios of Weighing Indicator

Weighing Indicator The working principle determines its wide applicability. The following are several typical scenarios:

Industrial batching: In the production of chemicals and building materials, multiple raw materials need to be mixed in precise proportions. Weighing Indicator can monitor the amount of each raw material added in real time, accurately control the feeding speed of each link, and ensure that the error of the batching ratio is within the allowable range.

Logistics and warehousing: In the cargo weighing link, Weighing Indicator can quickly obtain the weight of the cargo, and link with the code scanning equipment to bind the weight information with the cargo information to realize the automatic entry of inbound and outbound data.

Food and medicine: This type of industry has extremely high requirements for weight accuracy and hygiene. Weighing Indicator can not only ensure the consistency of packaging weight (such as the weight corresponding to the number of tablets per bottle), but also adapt to the clean and disinfected environment through sealing design.

Lifting equipment: On cranes, cranes and other equipment, Weighing Indicator can monitor the weight of the hoisted heavy objects in real time. When it exceeds the load-bearing limit of the equipment, it will immediately issue an alarm and cut off the lifting power to avoid safety accidents.

Choose a reliable Weighing Indicator Manufacturer

The performance of the Weighing Indicator directly affects the stability and accuracy of the weighing system, so it is crucial to choose a professional Weighing Indicator Manufacturer. High-quality manufacturers can not only provide equipment that meets industry standards, but also provide customized solutions according to the needs of different scenarios (such as high temperature environment, explosion-proof requirements), and provide comprehensive after-sales support (such as installation guidance, troubleshooting). As a manufacturer focusing on the research and development and production of Weighing Indicator, Webowt always takes accuracy, reliability and ease of use as the core to help various industries achieve efficient and accurate weighing management.