The stability of a security door is crucial for its effective performance. It is the fundamental requirement that customers look for when purchasing such a device. If a security door is unstable, it can lead to false alarms or missed detections, which may cause staff to become indifferent or even ignore the system entirely. In such cases, the security door fails to fulfill its intended purpose. The sensors of the security door—typically the two side panels—are open to the outside environment, meaning they both emit and receive electromagnetic waves. Since there are numerous sources of electromagnetic interference in the surroundings—such as high-voltage power lines, large motors, welding machines, microwave ovens, and walkie-talkies—these can generate electromagnetic fields that interfere with the normal operation of the security door. As a result, most security doors are affected to some extent by external factors. However, manufacturers with strong technical capabilities can address these issues, ensuring the stability of the security door and minimizing the impact of external interference.
In general, a well-designed security door should include a real-time signal strength indicator. This feature allows users to monitor both the size of metal objects being detected and the level of external interference. The signal indicator plays a vital role during installation and ongoing use. By adjusting the detection parameters based on the signal lights, the security door can be optimized to reduce the influence of environmental factors, thus improving detection accuracy. Unfortunately, some manufacturers remove or disable this feature to hide poor performance, or they turn it off when no one is passing through, giving the illusion that the system is functioning properly. In reality, the security door may be unstable, triggering unnecessary alarms regardless of whether someone is carrying metal or not. A security door equipped with a signal strength indicator can be fine-tuned during installation to counteract external interference, ensuring reliable and consistent operation.
Additionally, security doors with an environmental self-test function can effectively detect and eliminate interference. When testing a security door, it’s important to conduct the evaluation in the same environment—ensuring similar power supply conditions and levels of electromagnetic interference. Once powered on, the infrared sensor should be blocked to disable the infrared alarm function. Then, set the sensitivity to a higher level and let the security door remain in an alert state. Observe the blinking of the signal lights. If the lights are frequently flashing or causing chaotic alarms, try changing the operating frequency to avoid interference from nearby devices. Continue adjusting until the signal light activity is minimized. If the door still shows instability or triggers alarms after frequency changes, it indicates that the security door has poor stability and resistance to interference. Therefore, it's essential to compare different models under the same detection conditions (e.g., detecting the same type of metal object) to select the most reliable option.
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