Tube Magnets

They are incredibly versatile: you can use them as standalone inspection rods, or they can be arranged in rows to form grate magnets, drawer magnets, and magnetic liquid traps. Whether for food safety (HACCP) or equipment protection, tube magnets are the most cost-effective solution to remove iron from free-flowing powders, granules, and liquids.

To truly capture weakly magnetic particles or fine dust flowing at high speeds, magnetic gradient is the decisive factor. A high gradient generates a “snap” effect, pulling contaminants firmly against the tube surface and preventing them from being washed away by the product flow.

To achieve this critical combination of ultra-high surface gauss and intense gradient, our tube magnets utilize a repelling pole configuration (N-N, S-S). Instead of the standard N-S-N-S arrangement, we force identical poles against each other. This “magnetic compression” forces the flux lines out of the magnet mass and concentrates them into the steel pole pieces, creating a dense energy zone (pole peak) that maximizes capture efficiency.

Fine Pole Circuit (Thin Magnets = High Pole Density)

• The Configuration: Uses thinner magnets and pole pieces stacked closely together.

• The Physics: This dense arrangement creates more magnetic poles per meter. The flux lines loop back quickly, generating a high density of adsorption points along the tube.

• The Result: Maximizes the number of traps to catch particles, though the magnetic field is shallower.

• Best For: Capturing fine powders and paramagnetic dust that must touch the tube to be trapped.

Deep Field Circuit (Thick Magnets = Deep Reach)

• The Configuration: Uses thicker magnets and pole pieces.

• The Physics: The thicker magnet provides greater magnetomotive force. This forces the magnetic flux lines to project further outward before looping back.

• The Result: Achieves higher surface gauss and significantly extended magnetic reach.

• Best For: Capturing large tramp iron (nuts, bolts, nails) that need to be grabbed from a distance.

One size does not fit all. We customize the housing material and geometric shape to match your specific hygiene standards and flow characteristics.

Housing Material: 304 vs. 316L

The integrity of the magnetic rod relies on its “skin.” We offer two primary stainless steel grades, finished to sanitary perfection.

SS304 (Industrial Standard):

• Best For: General industrial applications such as plastics processing, ceramics, and recycling.

• Performance: Excellent durability and abrasion resistance for non-corrosive environments.

SS316L (Food & Pharma Grade):

• Best For: High-hygiene industries including dairy, baby food, and pharmaceuticals.

• Performance: Superior corrosion resistance against chlorides and acidic cleaning agents.

• Sanitary Polish: All 316L rods undergo precision polishing to achieve a surface roughness of Ra ≤ 0.4μm. This mirror-like finish eliminates microscopic crevices where bacteria could harbor, ensuring full compliance with FDA and EHEDG standards.

Geometric Configurations

The round rod (cylinder) is the industry standard, serving as the most versatile choice for 90% of grate magnets and magnetic liquid traps due to its ease of cleaning and uniform magnetic field.

However, to address specific flow dynamics and installation requirements, we offer two engineered alternatives:

Square Bar: Typically used in specific rectangular chutes or applications where secure, non-rotating mounting is required. Its flat surface also provides a stable contact area for specific heavy-duty flows.

Teardrop Rod (The Flow Optimizer):

• The Problem: In sticky or bridging-prone powders (like flour or starch), material tends to pile up on top of round rods, blocking the flow (“bridging” or “arching”).

• The Solution: The teardrop shape features a pointed top edge that acts like a knife, slicing through the material stream to prevent accumulation.

• Fluid Dynamics: The streamlined tail creates a controlled “turbulence zone” underneath the rod. This gentle rotation brings more particles into contact with the magnetic zone, significantly increasing capture efficiency without choking the flow.

To ensure long-term durability and contamination control, every batch of our magnetic rods undergoes a standardized manufacturing process. This begins with rigorous material preparation and precise assembly of the internal circuit to strictly adhere to the designed magnet pitch. Unlike budget options that rely on glue, we utilize fully hermetic welding to seal the end caps, ensuring the tube magnets remain physically impenetrable to liquids. The process concludes with multi-stage surface polishing to achieve the required sanitary finish, making the rods easy to clean and resistant to bacterial growth.

Quality assurance is equally rigorous. To guarantee structural integrity, we are fully equipped to perform waterproof verifications such as hot water immersion (bubble test) and hydrostatic pressure testing upon request. Furthermore, every single unit undergoes a final flux density scan to ensure the surface gauss meets your exact specifications, ensuring your magnetic rods arrive ready for heavy-duty operation.

Whether you need a single replacement rod or a bulk order for OEM equipment, our engineers are ready to assist with drawings and gauss calculations.