PML
Single Pole Suspended Permanent Magnet
Single Pole Suspended Permanent Magnet
Starting from Rs.47,557
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Product Details
At a Glance
A single pole suspended permanent magnet is a no-power magnet suspended above an open conveyor that arrests ferrous objects and fines before they reach a crusher, mill or bagging line, commonly used on grain, feed, dry chemical, salt, ceramic, cement clinker and coal conveyors. It's cleaned manually at scheduled intervals, with no power draw and no moving parts.
Suspended above an open conveyor, the PML Single Pole Suspended Magnet arrests ferrous objects and fines before they reach a crusher, mill or bagging line — grains and feed stuffs, dry chemicals, salt, ceramics, cement clinker, and coal on power-plant conveyors are all common applications. A single magnetic pole faces down into the material stream, holding tramp iron against the field until the unit is cleaned. See how customers are using this equipment in mining, cement and aggregates on our mining, cement & aggregates page, or in the steel industry on our steel industry page.
How It's Positioned
The unit is suspended on chains or a frame directly above the conveyor belt, spanning the belt width. As material passes underneath, the magnetic field reaches down into the burden depth and pulls ferrous contamination up against the underside of the housing, where it stays until manually cleared — a straightforward, no-power solution for lines that don't need continuous self-cleaning.
Standard Range
| Model No. | Dimensions W×L×H (mm) | For Belt Width (mm) | Belt Speed (m/s) |
| SPSM-0050 | 500×500×154 | 500 | 1.0 |
| SPSM-0066 | 650×650×154 | 650 | 1.2 |
| SPSM-0068 | 650×800×154 | 650 | 1.6 |
| SPSM-0088 | 800×800×154 | 800 | 1.2 |
| SPSM-0810 | 800×1000×154 | 800 | 1.6 |
| SPSM-1010 | 1000×1000×154 | 1000 | 1.2 |
| SPSM-1012 | 1000×1200×154 | 1000 | 1.5 |
Width is selected to match your conveyor belt width, and length/speed rating scales with how fast material moves beneath it — faster belts need a longer magnet footprint to give particles enough dwell time in the field.
Construction
Key Advantages
- No Power Required
A purely passive permanent-magnet system suspended above the line.
- Matched to Your Conveyor
Seven standard widths from 500mm to 1000mm, sized to common belt widths.
- Simple Installation
Suspended on chains or a support frame — no belt splicing or drive components involved.
- Protects Downstream Equipment
Stops tramp iron before it reaches crushers, mills or bagging lines.
Single Pole vs. Two Pole — Which Do I Need?
Single pole suspended magnets use one magnetic face and are a cost-effective choice for lighter contamination loads. For heavier or more frequent tramp iron, our Two Pole Suspended Permanent Magnet offers a stronger, dual-pole field.
Frequently Asked Questions
How is it cleaned?
Accumulated tramp iron is removed manually at scheduled intervals — how often depends on your contamination load and line speed.
Does it need any power supply?
No — it's a fully passive permanent-magnet unit, suspended above the belt with no electrical connection required.
Can it be sized to a non-standard belt width?
Yes — the standard range covers 500–1000mm belts; custom widths are available on request.
What belt widths does the standard range cover?
500mm to 1000mm across seven standard models — see the standard range table above.
How does belt speed affect which model I need?
Faster belts need a longer magnet footprint to give particles enough dwell time in the field, which is why length and speed rating scale together in the table above.
Why Buy From PML
- 65+ years of magnetic separation engineering — suspended magnets built for cement, power, food and chemical processing lines.
- Made and tested in-house — every unit is manufactured and checked before dispatch.
- Simple, reliable protection — no power, no moving parts, minimal upkeep.
- Magnetic calibration and audit services available to verify field strength over time.
Need a custom width or a stronger dual-pole unit? Enquire now and our engineering team will size the right suspended magnet for your conveyor.
Why Magnetic Strength Drops in Ferrous Separators (and When to Replace)
Separation efficiency falls as magnetic strength decreases. Below are the most common causes of reduced field strength in NdFeB (neodymium) magnetic separation equipment, along with the warning signs that indicate a magnet or separator needs replacing.
Causes of Reduced Magnetic Strength
- Thermal demagnetization: Standard Neodymium-Iron-Boron (NdFeB) grades lose magnetic strength when exposed to temperatures above their rating — often starting at 80°C / 176°F for standard grades. Exceeding these limits causes a permanent loss of magnetic flux.
- Corrosion and core oxidation: NdFeB is highly iron-rich and oxidizes quickly. If moisture, washdown liquids, or corrosive chemicals breach the outer stainless steel cladding, the magnet swells, crumbles, and loses field strength.
- Mechanical damage and internal cracking: NdFeB is brittle. Dropping magnetic tubes during cleaning, or subjecting them to heavy equipment vibration, causes internal micro-fractures that break the continuous magnetic circuit.
- Strong opposing magnetic fields: A sufficiently strong opposing field can overcome a material's coercivity and flip or randomize its magnetic domain polarity. High alternating current (AC) electric fields, in particular, create powerful local alternating magnetic fields that rapidly scramble domain alignment.
- Material buildup ("air gap" effect): Accumulated fine iron on the surface acts as a barrier, pushing the active magnetic field further away from incoming material. Because magnetic force decays exponentially with distance, even a few millimetres of buildup severely reduces capture rates.
- Increased process velocity or burden depth: Running material too fast, or in overly thick layers, prevents fine ferrous particles from spending enough time in the peak magnetic field zone to be pulled out of the flow.
Signs an NdFeB Magnet or Separator Needs Replacing
- Drop in gauss rating: Annual or semi-annual gauss testing shows a permanent drop of 10–15% or more from the baseline specification.
- Bulging or "pillow" swelling: The protective stainless steel tube cladding looks warped, swollen, or cracked — a sign of internal oxidation where rust has expanded inside the shell.
- Dead spots along the field: Measuring with a gauss meter reveals localised spots with zero or drastically lower magnetic pull across the grid or tube surface.
- Downstream metal contamination: Ferrous fines or tramp iron start showing up in final product testing or downstream machinery detectors despite the separator being clean.
- Structural casing punctures: Scratches, gouges, or pinhole leaks in the stainless steel jacket expose the internal magnetic circuit to moisture and process fluids.
Regular gauss testing (at least annually) is the most reliable way to catch strength loss before it affects downstream product purity — PML's own range of Gaussmeters and magnetic field meters covers this. If you're seeing any of the signs above, talk to our team about testing or replacing your separator.
