2 IntroductionMention 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.
3 Metal Detection Technologies Most Common are following three:Very low frequency (VLF)Pulse induction (PI)Beat-frequency oscillation (BFO)
4 Technologies Continue... VLF TechnologyVery 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.
5 Technologies Continue... PI TechnologyA 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 receiverThis technology sends powerful, short bursts (pulses) of current through a coil of wire. Each pulse generates a brief magnetic field.
6 Technologies Continue... BFO TechnologyThe 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.
7 Types of Metals & Sensitivity 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.
8 Walk-through Metal Detector Gate® 4000AWalk-through Metal DetectorHigh adjustable sensitivityGate® 4000A series walkthrough metal detectors gate is adjustable. In the highest volume, articles as small as a paper clip can be detected and indicated.Entry Passing LightsSmooth, efficient traffic flow with easy-to-view, eye-level passing lights on the entrance side of each panel.Overhead Control UnitLCD Display, alarm lights, LED bar graphs and control touchpad plus all wiring, connections and electronics are integrated into the overhead compartment.Audible and Visual AlarmsAudible alarm and LED lights signals when a target has been detected
9 Gate® 4000A Continue... 18 Detection Zones Password protection Gate® 4000A offers exclusive multiple targets pinpointingwith 18 distinct zones for full target coverage on the left, centerand right side of the body from head to toe.Password protectionGate® 4000A is designed for use by authorized personnel with multi-level security codes. It only allows authorized users to change settings.Harmless to human bodyUsing sensitive metal detecting technology is harmless for heartbeat of human body, magnetic tapes, video recording tapes and software disks and Cds.InterferenceDual channels and DSP circuitry allow several ST series scanner gates to operate simultaneously in close proximity to one another.
10 Gate® 4000A Continue... Traffic Counter Dimensions Electric current Gate® 4000A have function to counts the traffic which passed through the walkthrough gate.DimensionsOuter frame: 2.2 X0.79 X0.54M ( H X W X Depth)Inner frame: 2.0X0.7X0.540M (H X W X Depth) Electric current220V Power: 35VANet Weight±80kgWorking Temperature-20°C ~ ±45°CStandardGB and CE Approved
13 Mate® 3000 Hand-held Metal Detector Features & Specs:One Switch OperationUltimate SensitivitySimple and convenient to useNo adjustment is required.Drop voltage up to 7V not effected on detection distanceLow power consumption, 40 hours continuous worksLow battery alarmSwitch on/off beep prompt functionOptional rechargeable battery chargerBeep, LED and vibration alarm modes
14 Mirror® 2000 Under Vehicle Inspection Mirror Features & Specs:6 styles selection availableAvailable in 12" round convex or flat acrylic mirrorEquipped with adjustable swivel for infinite adjustmentHeavy-duty extruded rubber rim to help prevent damaging objects when maneuveringAvailable with tripod ball bearing caster wheels, allowing full range of motion with effortless maneuvering Lightweight with adjustable handleLow 3.5" ground clearanceAvailable with flashlight, batteries and mounting bracket for indoor or outdoor usage