Control & Automation Weighing Equipment, The Complete Guide to Modern Industrial Process Control
In today's manufacturing environment, accurate weighing is no longer just about knowing how much a product weighs. Modern businesses rely on weighing systems to automate production, improve efficiency, reduce waste, maintain quality, and provide real time process data.
Control and automation weighing equipment forms the backbone of countless industrial processes, from ingredient batching and chemical dosing to tank weighing and automated filling systems. By integrating weighing technology directly with PLCs, SCADA systems and industrial networks, manufacturers can achieve greater productivity while maintaining exceptional accuracy.
WOMAG supplies a comprehensive range of Control & Automation Weighing Equipment, including weight transmitters, process controllers, digital indicators, load cell interfaces and communication modules designed to integrate seamlessly into industrial automation systems.
For more information, browse our Control & Automation Weighing collection:
https://www.womag.co.uk/collections/control-automation-weighing
From Mechanical Scales to Intelligent Process Control
Industrial weighing has evolved dramatically over the last century.
Historically, manufacturing relied on:
- Mechanical platform scales
- Dial indicators
- Beam balances
- Manual recording of weights
- Operator controlled batching
Whilst dependable, these systems relied heavily on operator intervention, making them slower, more labour intensive and more susceptible to human error.
As manufacturing embraced automation, weighing equipment became integrated into production machinery, allowing businesses to automatically:
- Control ingredient dosing
- Monitor inventory levels
- Prevent overfilling
- Record production data
- Control filling machines
- Trigger alarms
- Start and stop conveyors
- Interface with enterprise software
Today, weighing systems have become intelligent measurement devices capable of communicating directly with factory control systems, helping manufacturers improve productivity whilst reducing waste.
What is Control & Automation Weighing?
Control and automation weighing refers to weighing equipment that actively controls manufacturing processes rather than simply displaying a weight.
Instead of acting as a standalone scale, modern systems communicate with:
- PLCs
- SCADA systems
- HMIs
- ERP software
- Manufacturing Execution Systems (MES)
- Remote monitoring platforms
This allows weight information to become part of an automated production process.
Typical equipment includes:
- Weight transmitters
- Digital weight indicators
- Load cell amplifiers
- Process controllers
- Junction boxes
- Signal conditioners
- Communication modules
- I/O controllers
These components convert load cell signals into accurate digital information that can be used throughout the production process.
Common Applications
Control weighing systems are used across almost every manufacturing industry.
Batch Weighing
Accurately dispensing raw materials before mixing or production.
Tank, Silo and Vessel Weighing
Continuous monitoring of inventory, process vessels and storage tanks for accurate stock control and automated replenishment.
Filling Systems
Automatically stopping pumps or valves once a target weight has been reached.
Loss-in-Weight Feeding
Maintaining a constant feed rate for powders and bulk materials.
Checkweighing
Automatically verifying finished products meet weight specifications before packaging.
Inventory Management
Real time stock monitoring without interrupting production.
The Benefits of Automated Weighing
Modern weighing systems offer much more than accurate measurements.
Benefits include:
- Reduced product waste
- Improved batch consistency
- Faster production
- Automatic data collection
- Full traceability
- Reduced operator error
- Better inventory control
- Improved quality assurance
- Easier regulatory compliance
- Lower operating costs
By removing manual intervention, manufacturers achieve both higher throughput and greater process reliability.
Communication and Industrial Integration
One of the biggest advantages of modern automation weighing equipment is its ability to communicate with existing factory infrastructure.
Typical communication protocols include:
- Modbus RTU
- Modbus TCP
- Ethernet/IP
- PROFINET
- PROFIBUS
- CANbus
- RS232
- RS485
- 4 to 20 mA analogue outputs
- Digital I/O
This enables weighing equipment to become an integral part of wider factory automation systems rather than operating independently.
Control & Automation in Hazardous Areas
Many industries using automated weighing systems also operate within hazardous environments.
Typical sectors include:
- Chemical manufacturing
- Pharmaceutical production
- Paint manufacturing
- Oil and gas
- Biofuels
- Food processing
- Powder handling
- Grain storage
Where flammable gases, vapours or combustible dusts are present, standard weighing equipment cannot simply be installed.
Instead, equipment must be suitable for the hazardous area classification.
Understanding ATEX Zones
Gas Zones
| Zone | Description |
|---|---|
| Zone 0 | Explosive gas atmosphere continuously present |
| Zone 1 | Explosive atmosphere likely during normal operation |
| Zone 2 | Explosive atmosphere only occasionally present |
Dust Zones
| Zone | Description |
|---|---|
| Zone 20 | Combustible dust continuously present |
| Zone 21 | Dust likely during normal operation |
| Zone 22 | Dust only occasionally present |
Correct classification should always be completed before selecting instrumentation, load cells or control equipment.
Zener Barriers, Protecting Intrinsically Safe Circuits
Where intrinsically safe equipment is installed inside an ATEX zone, one of the most important safety components is the Zener barrier.
A Zener barrier is installed between equipment located in the safe area and equipment installed within the hazardous area.
Its purpose is to:
- Limit voltage
- Restrict current
- Prevent excess electrical energy entering hazardous areas
- Protect intrinsically safe circuits during fault conditions
By preventing excessive electrical energy from reaching hazardous area equipment, Zener barriers help ensure the installation remains compliant with intrinsic safety requirements.
Barrier selection should always form part of the complete system design rather than being treated as an individual component.
Intrinsically Safe Power Supplies
Power supplies are another critical element of hazardous area control systems.
An intrinsically safe power supply is specifically designed to provide controlled electrical energy that remains below the ignition limits required for certified equipment.
These power supplies commonly support:
- Load cell systems
- Weight transmitters
- Process indicators
- Batch controllers
- Communication interfaces
Combined with suitable barriers and certified instrumentation, they allow automated weighing systems to operate safely within hazardous production environments.
Designing an Effective Control Weighing System
A successful automation project starts with understanding the process, not simply selecting an indicator.
Consider:
- Required weighing accuracy
- Process speed
- Environmental conditions
- Load cell selection
- Communication requirements
- PLC compatibility
- Future expansion
- Hazardous area requirements
- Maintenance access
- Calibration requirements
Every application is different, which is why many manufacturers choose bespoke system design and integration rather than off-the-shelf equipment.
Why Choose WOMAG?
WOMAG provides complete weighing automation solutions, from consultancy through to commissioning.
Our expertise includes:
- Weight transmitters
- Process controllers
- Digital indicators
- Load cells
- Tank, silo and vessel weighing
- PLC integration
- Automation programming support
- Hazardous area weighing
- Calibration
- Installation
- Ongoing servicing and maintenance
Whether you're upgrading an existing production line or designing a new automated process, our engineers can specify a weighing solution tailored to your application and operational requirements.
Frequently Asked Questions
What is control and automation weighing?
Control and automation weighing uses electronic weighing equipment integrated with PLCs, SCADA systems and industrial controllers to automate manufacturing processes using real time weight data.
What is a weight transmitter?
A weight transmitter converts the electrical signal from load cells into a digital or analogue output that can be used by PLCs, HMIs and process control systems.
Can weighing systems integrate with PLCs?
Yes. Modern weighing equipment supports a wide range of industrial communication protocols including Modbus, Ethernet/IP, PROFINET, PROFIBUS, RS485 and analogue outputs.
What industries use automation weighing?
Control weighing systems are widely used in food manufacturing, pharmaceuticals, chemicals, plastics, aggregates, recycling, logistics, agriculture and general manufacturing.
What is a Zener barrier?
A Zener barrier is an intrinsic safety device that limits voltage and current entering hazardous areas, protecting ATEX certified weighing equipment from unsafe electrical energy.
Why are intrinsically safe power supplies required?
They ensure electrical energy remains below ignition limits, allowing weighing equipment to operate safely within explosive atmospheres when used as part of a certified ATEX system.
Do all automation systems require ATEX equipment?
No. ATEX certified equipment is only required where explosive gases, vapours or combustible dusts are present. A hazardous area assessment should always be completed before equipment is selected.
Can existing weighing systems be upgraded?
In many cases, yes. Existing load cells can often be retained while upgrading indicators, transmitters and communications to integrate with modern PLC and automation systems, improving functionality without replacing the entire installation.