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Detect unwanted metal before it reaches a crusher, mill, downstream machine, or finished product. Corvelan supplies conveyor metal detectors for bulk-material belts, existing conveyor retrofits, underbelt installations, and packaged or unpackaged product inspection. Tell us what is moving, what metal matters, and what you want the line to do after detection. We can help you choose the right LJT model.
Start with the job you need the detector to do. A new bulk conveyor, an existing line, and individual product inspection need different detector layouts. The four common situations below will usually point you to the right LJT model family.
If you need to find tramp metal before a crusher, mill, shredder, or other downstream machine, compare LJT-A and LJT-E first.
Recommended: LJT-A or LJT-EIf you want to install the detector around an existing conveyor without cutting the belt, choose LJT-B first.
Recommended: LJT-BIf a full detector frame is hard to fit, LJT-H is the first model to check. It works best when the underbelt sensor can stay close enough to the metal you need to find.
Recommended: LJT-HIf individual products pass through a detector opening and the line must alarm, stop, or reject after detection, choose LJT-F first.
Recommended: LJT-F| Your situation | Recommended model | Check before you choose |
|---|---|---|
| New bulk conveyor carrying ore, coal, aggregate, or similar material | LJT-A / LJT-E | Check belt width, material depth, target metal, available space, and whether the line should alarm or stop. |
| Existing conveyor where you do not want to cut the belt | LJT-B | Check the belt construction, splice, fasteners, nearby steelwork, and space around the conveyor. |
| There is not enough room for a full detector frame | LJT-H | Check target size, material depth, and the distance from the underbelt sensor to the target. If the target is small or deeply buried, compare LJT-A or LJT-E instead. |
| Individual packaged or unpackaged products pass through a detector opening | LJT-F | Check the largest product size, detector opening, packaging, line speed, and what should happen after detection. |
| Small metal may be buried deep in bulk material | LJT-A / LJT-E first | A surrounding detector frame keeps the target closer to the sensing area than an underbelt-only setup. Send the normal and maximum material depth. |
| The belt has steel cords, metal clips, fasteners, or a metal splice | Send us the belt details first | Metal in the belt can affect detection. Do not choose a model from belt width alone. |
| The product uses foil or metallized packaging | LJT-F after a product/package check | Send the actual packaging details and the smallest metal you need to detect. |
| You only need continuous removal of magnetically responsive ferrous metal | Magnetic separator | Use a metal detector as well only when you also need an alarm, stop signal, or detection of other metal types. |
Use the model guide above to narrow your choice, then open the product page for the model that best matches your conveyor.
Frame-style tramp-metal detection for bulk-material belt conveyors. Current product information lists frame sizes for 500–2000 mm belt widths.
Choose this model when: you have room for a detector frame around the conveyor and bulk-material tramp metal is the main problem.
View LJT-A details
Split-frame detection for existing bulk conveyors. The frame is designed to fit around the conveyor without cutting the belt.
Choose this model when: easy retrofit is important. Send us details of steel cords, clips, fasteners, or metal splices before you choose the final size.
View LJT-B details
Bulk-conveyor detection for ferrous, non-ferrous, and manganese-steel tramp metal. Current product information lists 500–1800 mm belt-width options.
Choose this model when: you need bulk conveyor metal detection and the detector can be matched to the belt, material depth, target metal, and available installation space.
View LJT-E details
Inline metal inspection for packaged or unpackaged products that pass through a defined detector opening.
Choose this model when: you can define the product size, detector opening, line speed, packaging, and what the line should do after metal is found.
View LJT-F details
Compact underbelt sensing for conveyors where a full detector frame is hard to fit. Current LJT-H-2 information covers 500–1600 mm belt widths.
Choose this model when: installation space is limited and the metal you need to find can stay close enough to the underbelt sensor.
View LJT-H detailsUse this type for ore, aggregate, coal, minerals, recycling material, or other bulk material carried on a belt.
Use this type when individual products pass through a defined detector opening.
Tell us the metal type and size if you know them. “Detect metal” is usually too broad for a useful model recommendation because different metals and different target sizes do not produce the same detection result.
If iron or steel tramp metal is the main problem, first decide whether you need to detect it, remove it continuously, or do both. A metal detector gives a detection signal. A magnetic separator is used when continuous ferrous removal is the main job.
Use a metal detector when these metals must also be found. Do not rely on a conventional ferrous magnetic separator for this job. Send us the actual metal type and the smallest size that matters.
Stainless steel can be a harder target than the same size of ordinary steel in some applications. Tell us the stainless type if known, the target size, and what material or product surrounds it.
If you do not know exactly what metal may enter the line, tell us what has been found before and what damage or quality problem you are trying to prevent. Photos or real contaminant samples can help define a more useful target.
A conveyor metal detector creates a sensing field around or below the conveyor path. When a metal object changes that field enough, the controller sends a signal to the line. The line can then alarm, stop, mark, or reject, depending on how your system is set up.
These conditions can make a small metal target easier or harder to find. Check them before you choose a detector from a catalog value alone.
Smaller metal is harder to find than larger metal. The type of metal and its position can also change the signal. Tell us the smallest or most damaging target that matters.
On a bulk conveyor, a deeper material layer can place the target farther from the detector. For product inspection, an opening larger than needed can also make small metal harder to find.
Moisture, mineral content, conductivity, and the product itself can change the background signal. If your material changes a lot, tell us the most difficult normal condition.
Steel cords, clips, fasteners, metal splices, foil, and metallized packaging can affect detection. Tell us about them before you choose the final model.
The line needs enough time and distance to stop, mark, or reject after metal is found. Product spacing also matters when individual items must be rejected.
Moving metal, steelwork, motors, power cables, vibration, and nearby magnetic equipment can make detection less stable. Choose a detector position where these effects can be controlled.
One condition may be easy to handle on its own. Two conditions together can change the better detector choice. These combinations are common reasons a detector that looks suitable on paper does not work as expected on the real line.
Choose the line action at the same time as the detector. Finding metal is only useful when the line does what you need next.
Use an alarm when an operator can check the event and remove the affected material or product manually.
Use a stop signal when the conveyor can stop safely and there is enough distance to find and remove the metal before it reaches the protected machine or product stream.
Use marking or automatic rejection when a product or defined section of material must be separated after detection. The timing must match line speed and the distance to the reject point.
Send us the conveyor speed, what is moving, and what you want to happen when metal is found. We can help match the detector and line action.
Help Me Choose a Detector| What you need | Choose | Why |
|---|---|---|
| Know that unwanted metal entered the line and trigger an alarm, stop, or control signal | Conveyor metal detector | You need to detect a metal event and make the line respond. |
| Continuously remove suitable magnetically responsive ferrous metal | Magnetic separator / conveyor magnet | Your main job is physical ferrous removal. |
| Detect a wider range of metal and also remove ferrous metal continuously | Use both | The detector and magnetic separator do different jobs and can be used together. |
Install the detector before the machine or product point you want to protect. Keep it away from avoidable moving metal and leave enough distance for the conveyor to stop or reject after detection.
| What to check | Why it matters | What to send us |
|---|---|---|
| Conveyor shape | The detector must fit your flat or troughed conveyor and stay close enough to the material for reliable detection. | Belt width, conveyor cross-section, flat/troughed shape, and available space. |
| Material depth | A deeper material layer, often called burden depth, can place the metal farther from the detector. | Material type, normal and maximum depth, particle or lump size, and moisture when relevant. |
| Belt construction | Steel cords, clips, fasteners, and metal splices can affect detection. | Belt specification and clear photos of the splice or fasteners. |
| Nearby metal | Moving steel and nearby metalwork can disturb the detector. | Side and top photos showing rollers, steelwork, and moving parts. |
| Motors and electrical equipment | Motors, power cables, motor drives, and nearby magnetic equipment can affect a sensitive detection area. | A simple equipment layout or marked installation photos. |
| Distance after detection | The line needs enough distance to stop, mark, or reject at the real conveyor speed. | Line speed, distance from detector to stop/reject point, and required action. |
A side photo, top photo, and simple conveyor sketch are often enough for us to help choose a suitable detector position.
Do not assume the detector itself is the problem first. Compare what changed on the line with the condition the detector was set up for.
First check whether the target is smaller, farther from the detector, or buried deeper than before. Also check whether the product, material depth, speed, or detector opening has changed.
Check for metal clips, a changed belt splice, loose steelwork, moving parts, new motors or cables, and other metal close to the detection area.
The material or product may be changing the background signal, or the target may be farther from the detector when the belt is loaded. Compare the loaded condition with the empty-belt test.
The problem may be after detection. Check conveyor speed, stop time, product spacing, reject timing, and the distance from the detector to the stop or reject point.
Look for changes in moisture, material depth, product temperature, belt tracking, vibration, or nearby equipment. A stable detector needs a reasonably stable installation and known product conditions.
Send us photos of the detector and conveyor, the target metal, normal material depth, belt details, and a short description of when the problem appears. That is usually more useful than changing settings at random.
The detector may fit the belt but still place small metal too far from the strongest sensing area. Material depth matters as well as belt width.
Steel cords, clips, fasteners, or metal splices can create problems if they are not known before ordering.
The detector can find metal but still fail to protect the process if the conveyor cannot stop or reject in time.
A sensitivity value measured with a different product, material depth, detector opening, or installation may not match your real conveyor.
For product inspection, use the smallest practical opening that safely passes the product. A larger opening can make small metal harder to detect.
If the real job is continuous ferrous removal, a detector alone is not the right starting point.
If the smallest detectable metal size matters to your order, tell us the target clearly. This is much more useful than asking for “high sensitivity.”
Tell us whether the target is iron/steel, stainless steel, non-ferrous metal, or another known metal. Add the size and shape if you know them.
For bulk material, tell us the normal and maximum material depth. For product inspection, tell us the largest product size and where the metal may sit inside the product.
Tell us the line speed and the normal product, packaging, or material condition. If one normal condition is harder to inspect, send that condition too.
A conveyor metal detector checks bulk material or individual products while they move on a conveyor. When metal creates a strong enough signal, the detector can send an output for an alarm, stop, mark, reject, or other line action.
For a new bulk conveyor, compare LJT-A and LJT-E first. Choose LJT-B first for an existing conveyor where you do not want to cut the belt. Check LJT-H when installation space is tight and an underbelt sensor can stay close enough to the target. Choose LJT-F for packaged or unpackaged products that pass through a detector opening.
Yes, conveyor metal detectors can be used for non-ferrous targets as well as ferrous metal. The metal type, size, product or material, and installation all affect the result, so send us the actual target you need to find.
Stainless steel can be part of the detection target, but the result depends on the stainless type and size as well as the product or material around it. Tell us the stainless target you need to find instead of asking only for “metal detection.”
The detector finds the metal and sends a signal. Removal needs another action, such as stopping the belt for manual removal, rejecting an individual product, or using a magnetic separator for suitable ferrous metal.
No. For product inspection, use the smallest practical opening that safely passes your largest normal product. An opening larger than needed can make small metal harder to detect.
Do not choose the detector from belt width alone. Steel cords, metal clips, fasteners, and splices can affect detection, so send us the actual belt construction before choosing the final model.
Install it before the machine or product point you need to protect. Keep the detection area away from avoidable moving metal and leave enough distance for the conveyor to stop or reject after metal is found.
Metal type and size, material depth, detector opening, product or material condition, belt construction, packaging, speed, nearby metal, vibration, and electrical equipment can all affect how small a target can be found.
Choose a metal detector when you need to know that metal entered the line and want an alarm, stop, or reject signal. Choose magnetic separation when the main job is continuous removal of suitable ferrous metal. Use both when you need both functions.
Send us what is moving, the metal you need to find, the belt or product dimensions, and what you want the line to do after detection. Conveyor photos and belt or packaging details are also helpful.
No. Belt width helps with physical fit, but you should also check material or product size, target metal, belt construction, installation space, line speed, and the action needed after detection.
The loaded material can change the background signal, increase the distance between the target and detector, or change how the target passes through the sensing area. Check the real material depth and product condition, not only the empty-belt result.
Check for metal in the belt, loose or moving steelwork, changed splices or fasteners, nearby motors or cables, vibration, and changes in the material or product. Find what changed before changing detector settings at random.
Send us the normal and maximum material depth. If small metal matters, the deeper condition is usually the more important one to check because the target can be farther from the detector.
You do not need a long specification sheet to contact us. Send these four details first. If your line changes between normal conditions, include the hardest normal condition too. We can then tell you which LJT model is the best place to start.
Helpful extras: a side photo, top photo, belt/splice detail, and a simple conveyor drawing. For product inspection, also send the largest product size and packaging details.
Tell us what is moving, what metal you need to find, the conveyor or product size, and what you want the line to do after detection. We can recommend which LJT model to start with and tell you what extra details are needed for quotation.
Send Your Conveyor Detection Requirement