Every time we pass the airport, railway station and subway security inspection, we will find that the security inspectors will check the liquid carried by passengers. Generally, they will take a small torch-like instrument to spray at the liquid bottles and cans carried by passengers. A desktop dangerous liquid detector is also used to determine whether the filling liquid carried by passengers is liquid or not in a few seconds. Flammable and explosive dangerous liquids. Why is this instrument so magical? What is its working principle?
This small instrument is called hand-held liquid detector. It is based on the principle of quasi-static computerized tomography (QCST) technology. It can determine the flammability and explosiveness of the liquid by measuring its dielectric constant and conductivity. The detector can distinguish flammable and explosive liquids such as sulfuric acid, gasoline, acetone, ethanol from safe liquids such as water, cola, milk and fruit juice without direct contact with liquids. When using this method to detect liquid, the test results are independent of the size of the container where the liquid is to be measured, and the air gap between the detector and the container will not affect the measurement results.
The operation of hand-held liquid detector is very simple. When in use, only the probe of hand-held liquid detector is placed on the side of the container to be tested (glass bottle, iron bottle, plastic bottle, etc.), the detection height is lower than the liquid level in the container, and then the detection button is pressed. The green indicator light is on, and the O and "safe liquid" words appear on the display screen. It shows that the liquid in the container is safe; the red indicator light is on, X and "dangerous liquid" appear on the display screen, and the alarm sound is heard at the same time, indicating that the liquid in the container is flammable and explosive. The liquid detector does not contain ions, microwave radiation sources and other potential dangerous elements, and is safe for operators.
Handheld liquid detector? It has the advantages of small size, fast analysis and easy operation. It can quickly identify flammable and explosive liquids without touching liquids. It is widely used in transportation departments such as stations, metros, airports, ports, embassies, police stations, fire stations, courts and other public prosecution law and government agencies. Security inspection of large-scale venues such as expositions, sports meetings and concerts.