Introduction to Powder Sampling and Handling Systems
In the food processing industry, managing powdered raw materials requires technologies that ensure precision, repeatability, and process control.
Sampling is a critical step to guarantee product quality, compliance, and traceability, especially in automated production lines.
Modern sampling systems must integrate seamlessly with powder dosing and handling processes, ensuring operational continuity, safety, and compatibility with food-grade and ATEX environments, in line with industrial automation and Industry 4.0 standards.
This case study analyzes the implementation of CMPR series screw samplers, applied to two different production scenarios: powdered coffee in an inert atmosphere and whey protein powder (WPC80) in an ATEX environment.
The Challenge: Precise Sampling in Complex Operating Conditions
The project required managing two applications with different but complementary challenges:
1. Coffee Powder Sampling in a Controlled Atmosphere
- Presence of nitrogen in the hopper
- No opening of the system allowed
- Small sample volumes (~10 g) required
- Maintain process integrity
2. Whey Protein Powder (WPC80) Sampling
- Fine powder with low bulk density (0.25–0.43 kg/dm³)
- ATEX Zone 21/22 environment
- Controlled flow rates required (1–2 kg/h)
- Integration on DN150 and DN300 lines
In both cases, the system needed to ensure:
- Representative and repeatable sampling
- Flow rate control
- Operational safety
- Integration with existing equipment
The Solution: CMPR Series Screw Samplers
The adopted solution is the CMPR series screw sampler, designed for industrial sampling of powders and granular products.
These systems can be installed in:
- Storage hoppers and silos (CMPR_A)
- Product drop ducts (CMPR_B)
The principle is based on a screw conveyor that extracts product from the process and transfers it to containers or bags.
System Architecture and Technical Features
The system is engineered for reliability, hygiene, and dosing precision, with features typical of industrial powder handling and dosing systems:
Structure and Materials
- AISI 304 / 316 stainless steel construction
- Tri-clamp sanitary connections
- PTFE food-grade seals
- CE 1935/2004 compliant
Extraction Screw
- Stainless steel construction
- Length optimized per application
- Controlled product transport
- Direct sample discharge
The screw is the core of the system, ensuring continuous flow and precise sampling.
Drive and Control System
The screw rotation is driven by a gearmotor sized according to the required flow rate, offering:
- Three-phase or brushless motor options
- Inverter control
- Adjustable speed and flow
A key feature is reversible rotation, allowing:
- Sample extraction
- Controlled product return into the process
Automation and Process Logic
The system can integrate with a control panel equipped with:
- Inverter
- Direction selector
- Timer
This allows automated sample cycles according to programmable logics (work-pause sequences), improving:
- Process repeatability
- Operational control
- Integration with automated production lines
Performance and Operating Parameters
CMPR samplers are designed to operate with:
- Controlled flow rates (0,5–4 kg/h)
- Fine powder products
- Varying industrial conditions (temperature and environment)
The system ensures stable flow and precise dosing, critical in industrial processes.
Advantages of the Screw Sampling System
The CMPR series offers numerous benefits:
- Precise and repeatable sampling
- Operation in closed systems (even with inert atmosphere)
- ATEX-compliant for hazardous environments
- Food-grade hygiene standards
- Easy integration with existing lines
- Reduced contamination risk
- Flow and process control
Applications in Food Processing
The system is suitable for multiple powder handling applications:
- Ground coffee
- Whey protein (WPC)
- Food ingredients
- Powders and additives
Conclusion
Integrating a CMPR series screw sampler provides an advanced solution for industrial powder sampling.
By combining dosing precision, flow control, automation, and operational safety, the system improves product quality and overall process efficiency.
In complex environments such as ATEX zones or inert atmospheres, these samplers ensure reliability, continuous operation, and compliance with industrial standards, making them ideal for modern, Industry 4.0-oriented plants.
