Introduction
Infrared linear security detectors (ILOI) are a reliable and widely used means of preventing unauthorized entry into a protected area. However, even high-quality equipment, if installed incorrectly, may fail at a critical moment or give false positive responses. In this article, we will look at the main mistakes that are made during the installation of ILOI, and give recommendations on how to eliminate them.
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1. Incorrect choice of installation location
Insufficient overview of the protected area. Detectors are often mounted so that their beams intersect with obstacles (shrubs, branches, fences), which leads to false alarms or "blind spots".
Proximity to heat sources. Installation near air conditioners, ventilation outlets, or heat pipes disrupts the stability of the temperature background and causes false alarms.
Recommendation: check the entire length of the beams for interference at a height of 0.2–1.2 m from the ground and make sure that there are no powerful heat sources nearby.
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2. Alignment and adjustment errors
Incorrect alignment of the counter. Linear detectors are installed in pairs "receiver–transmitter" and require precise beam guidance. Even a displacement of 1-2 cm over several meters leads to a decrease in sensitivity.
No periodic adjustment check. Over time, under the influence of vibrations, wind, or temperature fluctuations, the optics may "move away" from the original point.
Recommendation: always use the built-in laser pointer (or an external optical sight), adjust the receiver so that the alignment signal is at its maximum, and secure the fasteners with sealed clips.
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3. Incorrect installation and protection of cables
The gasket is in an open, unprotected form. Lightning-resistant, power or signal cables without protective corrugations or cable channels are vulnerable to mechanical damage and intruders.
Lack of grounding and lightning protection. Linear detectors are extended over long distances, which increases the risk of surge surges.
Recommendation: use a shielded cable laid in metal or PVC ducts, install lightning protection devices and firmly ground the supporting structures.
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4. Non-compliance with the height and angle of installation
The location is too low or too high. The optimal height for an ILOI is usually 0.6–0.8 m from ground level. When installed above, "dead zones" appear closer to the ground, below — smoke, cobwebs, small debris lead to false alarms.
Incorrect U-turn angle. The linear rays should be parallel to the surface of the earth. Skewed installations and plane distortions degrade the detection area.
Recommendation: measure the height of the installation from the ground, use a level and an angle gauge to achieve a strictly horizontal orientation.
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5. Ignoring external environmental factors
Weather conditions. Rain, snow, fog, and sunbeams on optics are common causes of problems.
Temperature differences. Unprepared detectors without thermal compensation can "drift" over the trigger threshold when the temperature changes.
Recommendation: choose models with automatic thermal compensation and protective visors, mount the elements so that no direct moisture gets on the optics.
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6. Insufficient configuration and testing
No testing after installation. Sometimes the installation is considered completed immediately after the power supply, without checking the sensitivity along the entire length of the zone.
Lack of regular technical inspections. Even a properly installed detector requires monthly checks of the integrity of the optics, cables and the reliability of the fasteners.
Recommendation: After installation, perform a beam cutting test in each sector, prepare maintenance instructions and a schedule of routine inspections.
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7. Incorrect choice of additional accessories
Using unsuitable brackets. Universal holders may not provide a rigid fixation, which will lead to displacement after a strong wind.
No thermal or heated enclosures. In conditions of severe frosts or snow accumulation, the optics may become covered with ice.
Recommendation: use factory mounting kits, take into account the specifics of the climate and consider frost protection.
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Conclusion
Proper installation of infrared linear security detectors is the key to reliable operation of the security system. Careful planning, the use of specialized tools and compliance with the manufacturer's recommendations will help to avoid major mistakes. Regular maintenance and testing will help to maintain the efficiency of the system for many years.
