PML
Two Pole Suspended Permanent Magnet
Two Pole Suspended Permanent Magnet
Starting from Rs.47,557
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Product Details
At a Glance
A two pole suspended permanent magnet is a no-power magnet suspended above an open conveyor that uses a dual-pole magnetic circuit to capture ferrous fines and objects from grain, feed and bulk material, cleaned manually at scheduled intervals. PML's units are rated up to 2,500 Gauss for continuous operation up to 80°C.
Where a single magnetic pole isn't enough field strength for the contamination load, the PML Two Pole Suspended Permanent Magnet steps up. Suspended above an open conveyor, it uses a dual-pole magnetic circuit to arrest ferrous objects and fines from grains, feed stuffs, raw and processed products, dry chemicals, salt, ceramics, cement clinker and coal on power-plant conveyors — the same applications as our single pole unit, with a stronger field for heavier or more frequent contamination.
How It's Positioned
The unit is suspended on chains or a frame directly above the conveyor belt, spanning the belt width. The two-pole design creates a stronger, more concentrated magnetic circuit than a single-pole unit, reaching further into the material burden to hold ferrous contamination against the underside of the housing until it's manually cleared.
Standard Range
| Model No. | Dimensions W×L×H (mm) | For Belt Width (mm) | Belt Speed (m/s) |
| SPM-0050 | 500×500×245 | 500 | 1.0 |
| SPM-0066 | 650×650×245 | 650 | 1.2 |
| SPM-0068 | 650×800×245 | 650 | 1.6 |
| SPM-0088 | 800×800×245 | 800 | 1.2 |
| SPM-0810 | 800×1000×245 | 800 | 1.6 |
| SPM-1010 | 1000×1000×245 | 1000 | 1.2 |
| SPM-1012 | 1000×1200×245 | 1000 | 1.5 |
| SPM-1212 | 1200×1200×245 | 1200 | 1.5 |
Width is selected to match your conveyor belt width, and length/speed rating scales with material throughput. The extra 91mm of housing depth over the single pole range (245mm vs. 154mm) reflects the added second pole assembly.
Key Advantages
- Stronger Field Than Single Pole
The dual-pole circuit reaches further into the material burden for heavier contamination loads.
- No Power Required
A fully passive permanent-magnet system suspended above the line.
- Eight Standard Sizes
500mm to 1200mm, matched to common conveyor belt widths.
- Protects Downstream Equipment
Stops tramp iron before it reaches crushers, mills or bagging lines.
Two Pole vs. Single Pole — Which Do I Need?
Two pole suspended magnets deliver a stronger magnetic circuit for heavier or more frequent contamination. For lighter loads, our Single Pole Suspended Permanent Magnet is a lower-cost option.
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.
Why choose two pole over single pole?
The dual-pole design gives a stronger, more concentrated field, useful where contamination is heavier or the burden depth is greater than a single pole magnet can reliably reach.
Can it be sized to a non-standard belt width?
Yes — the standard range covers 500–1200mm belts; custom widths are available on request.
What belt widths does the standard range cover?
500mm to 1200mm across eight standard models — see the standard range table above.
How much deeper is the housing than the single pole version?
91mm deeper — 245mm versus 154mm — reflecting the added second pole assembly.
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.
- Stronger capture — the dual-pole circuit is our recommended option for heavier contamination loads.
- Magnetic calibration and audit services available to verify field strength over time.
Need a custom width or unsure which pole configuration is right for you? 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.
