PML
Magnetic Hump
Magnetic Hump
Starting from Rs.38,037
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Product Details
At a Glance
A magnetic hump is a gravity free-fall separator with two magnetic plates in an offset Z arrangement, built for lumpy, high-volume, abrasive materials like grain, wood chips and sand that would wear out a delicate separator quickly. PML's magnetic humps are rated up to 4,500 Gauss for continuous operation up to 250°C.
Some materials don't flow evenly — they arrive in lumps, at high volume, and abrasive enough to wear out a delicate separator fast. The PML Magnetic Hump is built for exactly that: a gravity free-fall separator for feed, grain, wood chips, foodstuffs, sand and plastic, using an offset "Z" arrangement of two magnetic plates to both break up lumps and capture embedded iron as material drops through. See how customers are using this equipment in grain, flour and feed handling on our grain, flour & feed page, in pharmaceutical processing on our pharmaceutical processing page, or in textile manufacturing on our removing rust stains from fabric page.
How It Works
Two magnetic plates are mounted in an offset "Z" arrangement inside a vertical housing rated for gravity flow and moderate positive or negative pressure. The angled shape directs falling material into the magnetic field while preventing it from bridging or building up. Material strikes the first magnet, changes direction, and falls onto the second — giving ferrous contamination two separate chances to be captured before clean product exits.
High or Low Intensity
| Grade | Field Strength | Max. Operating Temp. | Attraction Distance |
| High-Intensity (RHMH / SHMH) | 4,500 ± 500 Gauss | 80°C | 3–4″ |
| Low-Intensity (RLMH / SLMH) | 1,500 ± 200 Gauss | 250°C | 4–6″ |
Standard Range (Round Shape, High-Intensity)
| Model | Inlet/Outlet Dia. (mm) | Total Height (mm) | Magnetic Plate Size (mm) |
| RHMH-10 | 100 | 800 | 205×105×46 |
| RHMH-15 | 150 | 800 | 255×155×46 |
| RHMH-20 | 200 | 950 | 305×205×46 |
| RHMH-25 | 250 | 1100 | 355×255×46 |
| RHMH-30 | 300 | 1200 | 405×305×46 |
The same five sizes are available in square inlet format (SHMH series) and in low-intensity round/square variants (RLMH/SLMH) — every configuration ships with matching inlet and outlet flanges.
Key Advantages
- Breaks Lumps and Captures Iron
The offset Z-design does both jobs in one pass — no separate de-lumping stage needed.
- Built for Abrasive, High-Volume Flow
Housing and plates are rated for the toughest free-fall applications: sand, grain, wood chips and similar bulk materials.
- Hinged Plates
High-power magnetic plates are hinged for easy periodic cleaning.
- No Power Cost
Fully passive permanent-magnet operation, maintenance-free beyond periodic cleaning.
Frequently Asked Questions
Round or square inlet — which do I need?
It comes down to your existing duct or chute opening — both shapes are available across the same size and intensity range.
What makes this different from a magnetic chute?
The offset two-plate "Z" design specifically targets lumpy, high-volume, abrasive materials — breaking up lumps as it separates, rather than just trapping iron from a steady free-flowing stream.
How is it cleaned?
The magnetic plates are hinged and swing open for periodic manual cleaning — no tools or power required.
What size range is available?
Inlet/outlet diameters from 100mm to 300mm across 5 standard sizes, in both round and square format.
How far does the magnetic field reach?
3–4 inches for the high-intensity grade, and 4–6 inches for the low-intensity grade.
Why Buy From PML
- 65+ years of magnetic separation engineering — equipment built for the toughest bulk-material handling applications.
- Made and tested in-house — every unit is manufactured and checked to its stated Gauss rating.
- Two intensity grades — from 1,500 Gauss (250°C) to 4,500 Gauss (80°C), matched to your material.
- Magnetic calibration and audit services available to verify field strength over time.
Handling lumpy, abrasive or high-volume material? Enquire now and our engineering team will size the right hump for your line.
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.
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