PML
Drawer Type Magnetic Grills
Drawer Type Magnetic Grills
Starting from Rs.23,776
Download Catalogue (PDF)
Product Details
At a Glance
A drawer type magnetic grill mounts the magnetic elements on a sliding drawer inside a stationary housing, so it can be pulled out, cleaned and slid back in without disturbing the duct connections. PML's drawer grills are rated up to 12,000 Gauss for continuous operation up to 350°C, in Stainless Steel 304/316 with ferrite or high-intensity rare-earth NdFeB elements.
A fixed grill has to be lifted out of the line to inspect or clean. The PML Drawer Type Magnetic Grill solves that by mounting the magnetic elements on a sliding drawer inside a stationary housing — pull the drawer, clean it, slide it back, without disturbing the duct connections. It's built for the same job as our standard grill — trapping iron particles from dry, granular or free-flowing material — in a format designed for lines where the grill needs checking often.
Stainless Steel 304/316 throughout, with magnetic elements in hard ferrite ceramic or high-intensity rare-earth NdFeB, sized to your duct or chute.
Single or Double Drawer
Single-drawer units handle contamination within roughly 1–1.5% by weight of the product. Where contamination runs higher, a double-drawer unit — with more magnetic elements across two drawers — keeps the grill effective without needing more frequent cleaning.
Customized double-drawer builds are also available for higher-throughput lines:
Standard Range — High-Intensity (11,000 ± 500 Gauss) & Super High-Intensity (12,000 ± 500 Gauss)
| Single Drawer, High-Intensity (Model prefix HSDG) | |||
|---|---|---|---|
| Model No. | Dia. A (mm) | Height B (mm) | Magnetic Elements |
| HSDG1 | 100 | 165 | 3 |
| HSDG3 | 200 | 165 | 5 |
| HSDG5 | 300 | 165 | 6 |
| HSDG7 | 400 | 165 | 8 |
| Double Drawer, High-Intensity (Model prefix HDDG) | |||
| HDDG1 | 100 | 250 | 5 |
| HDDG3 | 200 | 250 | 9 |
| HDDG5 | 300 | 250 | 11 |
| HDDG7 | 400 | 250 | 15 |
Both single and double drawer units are also available in Super High-Intensity (12,000 ± 500 Gauss) at the same diameters, and in intermediate sizes (150mm, 250mm, 350mm) not shown above — the full range runs 100mm to 400mm in 50mm steps.
Key Advantages
- Clean Without Disconnecting
The drawer slides out for cleaning while the housing stays fixed in the line.
- Single or Double Drawer
Scale the number of magnetic elements to your contamination load.
- Four Intensity Grades
From standard high-intensity up to 12,000 Gauss super high-intensity.
- High-Temperature Options
Rated up to 350°C with Samarium Cobalt (SmCo) magnets for hot process lines.
Where It's Used
Plastics, food processing (sugar, coffee, tea, grains, pulses, flour, spices, milk), pharmaceutical, chemical, ceramic, colours and paints, pigments, ink, refractory and mineral processing. See how customers are using this equipment on our food & powder processing page, in grain, flour and feed handling on our grain, flour & feed page, or in plastics and chemical processing on our plastics & chemical processing page.
Frequently Asked Questions
Single or double drawer — which do I need?
Single drawer suits contamination up to roughly 1–1.5% by weight. Above that, double drawer adds more magnetic elements so the grill stays effective between cleanings.
How hot can the process be?
Standard units run to 80°C (NdFeB) or 250°C (ferrite); with Samarium Cobalt magnets, high-intensity units are rated up to 350°C.
Can the drawer be cleaned without stopping the line?
The drawer needs to be withdrawn to clean, so the line segment it's fitted to should be briefly isolated — but the housing itself stays connected, so there's no re-plumbing each time.
What size range is available?
The full range runs from 100mm to 400mm in 50mm steps, in both single and double drawer, at every intensity grade.
What magnet material is used?
Standard units use hard ferrite ceramic or high-intensity rare-earth NdFeB; high-temperature variants use Samarium Cobalt (SmCo) for service up to 350°C.
Why Buy From PML
- 65+ years of magnetic separation engineering — trusted by Hindustan Unilever, Cipla, Tata Tea and Pidilite Industries, among others.
- Made and tested in-house — every grill is manufactured and checked to its stated Gauss rating.
- Helps meet regulatory requirements — consistent iron removal supports FDA and other contamination-level compliance.
- Magnetic calibration and audit services available to verify performance over time.
Need a custom size, drawer configuration or high-temperature build? Enquire now and our engineering team will size the right grill for your process.
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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