When using metal detectors, many customers frequentlyencounter issues such as suboptimal inspection results, false rejects, or
missed detections. These problems are often closely related to the equipment's
detection sensitivity. This article lists nine common factors that affect the sensitivity ofmetal detectors, aiming to provide a reference for customers to optimize their
inspection solutions.
Part 1: Nine Core Factors AffectingSensitivity
1. Metal Type and MagneticPermeability
Different metals respond uniquely tothe electromagnetic field generated by the detector.
· Ferrous metals (Fe): Magnetic and highly conductive, making them the easiest to detect.
· Non-Ferrous metals (Copper, Aluminum): Non-magnetic but excellent conductors, showing a moderate response.
· Stainless Steel (SS, e.g., Grade304/316): Non-magnetic and poor electricalconductors, presenting the highest challenge for standard detection systems.
2. Contaminant Geometry andOrientation
Sensitivity is typically calibratedusing perfect spherical test pieces. However, real-world contaminants like
wires, swarf, or flat flakes introduce orientation challenges. A long, thin
wire passing perpendicular to the coil is much easier to identify than one
passing parallel to the axis of the aperture.
3. Product Effect (Conductivity andPermeability)
Products containing high moisture,salt, or blood content (such as fresh meat, cheese, and pickles) create an
independent signal known as the "Product Effect." This signal can
mask small metal contaminants, requiring advanced phase discrimination to
separate the product signal from the metal signal.
4. Aperture Dimensions
The physical size of the detector'sopening inversely impacts its sensitivity. A smaller aperture concentrates the
electromagnetic field, allowing for the detection of smaller contaminants.
Conversely, a larger aperture reduces the relative field disturbance caused by
a tiny contaminant, lowering peak sensitivity.
5. Operating Frequency
The choice of frequency directlychanges how well certain metals are detected. High frequencies improve the
detection of non-ferrous metals and stainless steel but exacerbate the product
effect in wet products. Low frequencies minimize the product effect but lower
the sensitivity for non-magnetic metals.
6. Product Temperature
Temperature shifts alter theelectrical properties of the product. Frozen foods have minimal product effect
because ice immobilizes the ions. As the product thaws, its conductivity rises
drastically, meaning temperature fluctuations on the line can trigger false
rejects if the system does not adapt dynamically.
7. Packaging Materials
The type of packaging materialsignificantly alters the detection environment. Metalized film packaging or
trays with aluminum elements shield the product, necessitating specific
specialized configurations or multi-frequency setups to look past the packaging
layer.
8. Vibration and MechanicalInterferences
Industrial environments generatestructural vibrations from nearby conveyors, motors, or blenders. These physical
movements can distort the delicate balance of the internal receiver coils,
leading to false signals if the equipment lacks robust structural damping.
9. Electromagnetic Interference (EMI)
External electrical noise fromheavy-duty machinery, variable speed drives (VFDs), or wireless networks can
introduce noise into the detection coils. Proper shielding, filtering, and
grounding are critical to maintaining stable operational thresholds.
Part 2: The Vixdetect Solution
Product Portfolio & DetectionPrinciple
Vixdetect metal detectors arespecialized, high-performance systems engineered to identify metal contaminants
within a wide range of products, with a core focus on the food and
pharmaceutical industries. Utilizing an innovative Balanced Three Coil System and anEncircling Coil (Cut-Away) structure, the equipment delivers high-precision
detection for minute metal contaminants.
Application-Specific Models:
· Free Fall Metal Detector: Designed for powders, granules, and bulk loose materials.
· Tablet Metal Detector: Tailored for tablets and capsules in pharmaceutical processing.
· Pipeline Metal Detector: Engineered for pumped liquids, pastes, slurries, and minced meats.
Part 3: Core Operational Advantages& Engineering
Vixdetect mitigates the nine corevariables through targeted engineering solutions:
Product Effect Management
· The Challenge: High-moisture and high-salt products exhibit high conductivity,creating a strong "product effect" that can cause false rejects or
missed signals.
· Vixdetect Solution: Equipped with Frequency Hopping Technology and Automatic PhaseAdjustment, combined with a proprietary Product Effect Suppression Algorithm,the system effectively minimizes product interference to optimize detectionconsistency.
Software Quality & IntelligentAutomation
· Technological Core: Powered by precision-engineeredinspection technology and robust algorithms, the software provides a highly
capable processing core.
· Auto-Learning Function: Features an intuitive auto-learning sequence that automaticallycaptures phase and frequency characteristics under actual line speeds.
· High-Capacity Storage & Localization: Supports storage for up to 200 product detection modes for rapidproduct changeovers without manual reconfiguration. It also features a Multilingual
Interface to support global factory operations.
Multi-Frequency Technology
· Versatility:Moving beyond traditional single-frequency constraints, Vixdetect systems
feature 4 built-in frequencies.
· Dual-Frequency Simultaneous Detection: Supports real-time synchronous detection using any dual-frequencycombination. By operating high and low frequencies simultaneously, the system
optimizes detection coverage across various product forms and a wide range of
metal types.
Environmental Resilience
· Robust Build:The entire machine features a rugged SUS (Stainless Steel) construction to
eliminate vibration noise.
· Moisture Protection: Equipped with a variable speed gearbox and excellent waterproofengineering, allowing it to withstand demanding washdown and humid production
conditions.
· Operating Parameters: Formulated to maintain stable performance within ambienttemperatures of 0–45℃ and relative humidity of 30%–85% (non-condensing).
Part 4: Value Proposition: WhyVixdetect?
· Intelligent Operation: The integratedauto-learning function pre-stores up to 200 product modes, streamlining product
transitions and reducing setup time.
· High-Efficiency Detection: Dual-frequency simultaneous processing optimizes sensitivity forchallenging contaminants like stainless steel and non-ferrous metals.
· User-Friendly & Durable: Built with full stainless steel construction and waterprooffeatures, the system is designed for demanding industrial hygiene standards.
· Customized Engineering: Recognizing that every production line is unique, we deliverpersonalized technical solutions tailored to each client's specific layout and
material characteristics.