Mention the words metal detector and you'll get completely different reactions from different people. For instance, some people think of combing a beach in search of coins or buried treasure. Other people think of airport security or the handheld scanners at a concert or sporting event. The fact is that all of these scenarios are valid. The metal detectors in airports, office buildings, schools, government agencies and prisons help ensure that no one is bringing a weapon onto the premises. Introduction
Most Common are following three: Very low frequency (VLF) Pulse induction (PI) Beat-frequency oscillation (BFO) Metal Detection Technologies
VLF Technology Very low frequency (VLF), also known as induction balance, is probably the most popular detector technology in use today. In a VLF metal detector, there are two distinct coils called Transmitter coil & Receiver coil. The metal detector can determine approximately how deep the object is buried based on the strength of the magnetic field it generates. The closer to the surface an object is, the stronger the magnetic field picked up by the receiver coil and the stronger the electric current generated. The farther below the surface, the weaker the field. Beyond a certain depth, the object's field is so weak at the surface that it is undetectable by the receiver coil. Technologies Continue...
PI Technology A less common form of metal detector is based on pulse induction (PI). Unlike VLF, PI systems may use a single coil as both transmitter and receiver This technology sends powerful, short bursts (pulses) of current through a coil of wire. Each pulse generates a brief magnetic field. Technologies Continue...
BFO Technology The most basic way to detect metal uses a technology called beat-frequency oscillator (BFO). In a BFO system, there are two coils of wire. If the coil search head passes over a metal object, the magnetic field caused by the current flowing through the coil creates a magnetic field around the object. As the frequency deviates from the frequency of the other coil, the audible beats change in duration and tone. The simplicity of BFO-based systems allows them to be manufactured and sold for a very low cost. Technologies Continue...
Ferrous metals are magnetic type metals such as steel and iron and are the easiest for metal detectors to find. Non-ferrous metals are non- magnetic metals such as copper, aluminum, brass, bronze, and are almost as easy to detect as ferrous metals. Non-magnetic stainless steel such as types 302, 304, and 316 are by far the most difficult of metals to detect. In general, a piece of non- magnetic stainless steel must be 1½ to 2 times larger than a ferrous piece of metal to be detected by a metal detector. Types of Metals & Sensitivity
Gate ® 4000A Walk-through Metal Detector Entry Passing Lights Smooth, efficient traffic flow with easy-to-view, eye-level passing lights on the entrance side of each panel. Overhead Control Unit LCD Display, alarm lights, LED bar graphs and control touchpad plus all wiring, connections and electronics are integrated into the overhead compartment. High adjustable sensitivity Gate ® 4000A series walkthrough metal detectors gate is adjustable. In the highest volume, articles as small as a paper clip can be detected and indicated. Audible and Visual Alarms Audible alarm and LED lights signals when a target has been detected
Gate ® 4000A Continue... Gate ® 4000A is designed for use by authorized personnel with multi- level security codes. It only allows authorized users to change settings. Password protection Harmless to human body Using sensitive metal detecting technology is harmless for heartbeat of human body, magnetic tapes, video recording tapes and software disks and Cds. 18 Detection Zones Gate ® 4000A offers exclusive multiple targets pinpointing with 18 distinct zones for full target coverage on the left, center and right side of the body from head to toe. Interference Dual channels and DSP circuitry allow several ST series scanner gates to operate simultaneously in close proximity to one another.
Gate ® 4000A Continue... Traffic Counter Gate ® 4000A have function to counts the traffic which passed through the walkthrough gate. Dimensions Outer frame: 2.2 X0.79 X0.54M ( H X W X Depth) Inner frame: 2.0X0.7X0.540M (H X W X Depth) Electric current 220V Power: 35VA Net Weight ±80kg Working Temperature -20°C ~ ±45°C Standard GB and CE Approved
How it works!
Mate ® 3000 Hand-held Metal Detector Features & Specs: One Switch Operation Ultimate Sensitivity Simple and convenient to use No adjustment is required. Drop voltage up to 7V not effected on detection distance Low power consumption, 40 hours continuous works Low battery alarm Switch on/off beep prompt function Optional rechargeable battery charger Beep, LED and vibration alarm modes
Mirror ® 2000 Under Vehicle Inspection Mirror Features & Specs: 6 styles selection available Available in 12" round convex or flat acrylic mirror Equipped with adjustable swivel for infinite adjustment Heavy-duty extruded rubber rim to help prevent damaging objects when maneuvering Available with tripod ball bearing caster wheels, allowing full range of motion with effortless maneuvering Lightweight with adjustable handle Low 3.5" ground clearance Available with flashlight, batteries and mounting bracket for indoor or outdoor usage