How to Use Handheld Metal Detectors Correctly

November 22, 2020

Hand-held metal detectors are designed to detect metal objects carried by people or objects. It can detect small pieces of metal contained in parcels, luggage, letters, fabrics, etc. The special appearance of its sensitive surface makes it easy to operate.
Hand-held metal detectors are better than ring-type sensors. Ultra-high sensitivity, special application. Such as chip factory, archaeological research, hospitals and so on. Hand-held metal detectors are used to check the exact location of metal carried by the person. They can also be used with metal detector doors. When the security door detects a metal object, a metal detector can be used to find the exact location of the metal object. Hand-held metal detectors use rectangular test heads. The detection area is 12 cm long. When the human body is inspected, inspections are completed from top to bottom.
Before use, first open the battery compartment cover on the back of the instrument and insert the battery. The instrument uses a 9V laminate battery. Please note that the nominal voltage on the battery must be 9V. Other voltages must not be used as substitutes. The power consumption of this instrument is very low, and each newly installed battery can work for about 50 hours. When the battery energy drops to 10%, the instrument can no longer work properly. At this time, the horn will give off an intermittent buzz, suggesting that we must replace the new battery.
In use, the security personnel hold the handle by hand, press the start button with the thumb, and then release, the signal light of the instrument will start to flash, and the horn will emit a very slight beep at the same time, indicating that the instrument enters the working state. Workers hold the switched-on instrument to scan the surface of the person (or object). If there is a metal object, the instrument will make a sound. After the inspection is completed, the stop button should be pressed to avoid wasting battery power.
How to determine the size of metal objects
Physiological studies have shown that human hearing is relatively insensitive to changes in the volume (logarithmic relationship), and is relatively sensitive to changes in the tone (linear relationship), the instrument according to the above situation, using the tone to determine the level of metal objects Size, which is different from other similar products, it allows us to more accurately identify different sizes of metal objects.
When the probe of the instrument sweeps over the human body (object), if a low sound is heard and the probe stays above the sounding part, the sound will gradually disappear and we can judge it as a very small metal, such as a belt buckle, Zipper and so on. If the sound is sharp, even if the probe is still and the sound is continuous, it must be a large metal.

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