The stability of a security door is crucial. It is the fundamental requirement for customers when making a purchase. An unstable security door can lead to false alarms or missed detections, which may cause staff to become indifferent and reduce the effectiveness of the system. Since the sensors of the security door—essentially the two side panels—are exposed, they can both emit and receive electromagnetic waves. This makes them vulnerable to interference from various external sources, such as high-voltage power lines, large motors, welding equipment, microwave ovens, and walkie-talkies. These devices generate electromagnetic fields that can disrupt the normal operation of the security gate. As a result, most security doors are affected to some extent by environmental factors.
Manufacturers with strong technical capabilities can address these stability issues and minimize external interference, ensuring reliable performance. A key feature that enhances this reliability is the real-time signal strength indicator. This indicator helps users understand the size of metal objects and the level of interference. During installation and ongoing use, it allows for fine-tuning of detection parameters, reducing the impact of external disturbances and improving accuracy. Unfortunately, some manufacturers disable or hide this feature, leading users to believe the system is functioning properly when it is actually unstable. In such cases, the security door may trigger unnecessary alarms regardless of whether a person is carrying metal or not.
Security doors equipped with a signal strength indicator can be adjusted based on the intensity of interference during setup, helping eliminate external influences and ensuring stable operation. Additionally, security doors with an environmental self-test function offer better anti-jamming capabilities. When testing in the same environment—ensuring consistent power supply and external electromagnetic conditions—turning on the system, blocking the infrared sensor, and setting the alarm sensitivity to a higher level can help identify potential issues. Observe the blinking signal lights; if there are many flashes or chaotic alarms, try changing the operating frequency to avoid interference from nearby devices. If the problem persists, it indicates poor stability and anti-interference performance. Comparing different models under the same detection conditions is essential to choose the most reliable option.
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