PML
Self Cleaning Magnetic Filter
Self Cleaning Magnetic Filter
Product Details
At a Glance
A self cleaning magnetic filter is a two-chamber, self-purging inline filter built for high-flow, high-contamination fluid lines like grinding coolant, honing fluid and hydraulic oil under heavy load. PML's self cleaning filters are rated up to 11,000 Gauss for continuous operation without stopping the line to clean.
High-flow, high-contamination fluid applications — grinding coolant, honing and milling fluids, hydraulic oils under heavy load — need more than a single-stage magnetic trap. The PML Self Cleaning Filter is a two-chamber, self-purging design built for exactly that: fluid enters the first chamber for primary filtration, then flows into a second, slower chamber where final filtration takes place before the cleaned fluid returns to your process.
What Clean Fluid Delivers
Running fully filtered fluid, free of micron-sized ferrous particles, directly improves surface finish and fluid flow on precision machining operations — while cutting scrap reduction costs and downtime caused by contaminated coolant or hydraulic fluid.
Standard Range
| Model No. | Height A (mm) | Diameter B (mm) | Flange CTC C (mm) | Elements | Flow Rate (L/min) |
| SCF1 | 835 | 200 | 540 | 6 | 500 |
Larger models (SCF2 and above) step up in height and diameter to handle higher flow rates — tell us your required throughput and we'll confirm the right model.
Key Advantages
- Two-Chamber Design
Primary and final filtration stages in one unit for consistently clean output, even on high-contamination fluids.
- Self-Purging
Reduces the operator intervention needed to keep the filter performing at rated capacity.
- Built for High Flow
Designed specifically for high-flow, high-contamination industrial applications like grinding and honing coolant loops.
- Improves Process Quality
Cleaner fluid means better surface finish, less scrap and fewer unplanned stops.
Where It's Used
Grinding, honing, milling and fine-finishing coolant systems, plus liquid pharmaceutical products, liquid chemicals, liquid food products, lubricants, coolants, hydraulic oils and slurries. See how customers in oil and liquid processing are using this equipment on our iron removal from oil & process liquids page.
Frequently Asked Questions
How is this different from the standard Magnetic Filter?
The standard filter is a single-chamber design; this Self Cleaning Filter uses two chambers — primary and final filtration — specifically for high-flow, high-contamination applications like grinding and honing coolant.
What flow rates does it support?
Standard models start at 500 L/min and scale up — tell us your required throughput and we'll confirm the right model or a custom build.
Does it need manual intervention?
It's designed to reduce operator intervention versus a standard filter, though periodic maintenance checks are still recommended for high-contamination duty cycles.
What's the smallest standard model's flow rate?
The SCF1 handles 500 L/min, with larger models (SCF2 and up) scaling to higher throughput.
How many magnetic elements does the standard model have?
6 elements in the SCF1.
Why Buy From PML
- 65+ years of magnetic separation engineering — high-flow filtration systems for demanding machining and process fluid applications.
- Made and tested in-house — every filter is manufactured and hydraulically tested before dispatch.
- Two-stage filtration — built specifically for high-contamination duty cycles a single-chamber filter can't handle.
- Magnetic calibration and audit services available to verify field strength over time.
Running a high-contamination coolant or hydraulic loop? Enquire now and our engineering team will size the right filter for your flow rate.
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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