Detect Intruders Early: OPTEX B-Zone Security Measures
What is OPTEX's B Zone?
OPTEX’s B Zone refers to outdoor areas within a property such as gardens, backyards, walkways, garages, parking spaces, and outside of windows. It is the middle area—not inside the building, and not outside the property boundary.
Because intruders often pass through this area when approaching a building, it becomes a critical point for early detection and security.
What is OPTEX's ``Level Surveillance Concept``?
OPTEX proposes a “Level Surveillance Concept” that divides a property into 3 zones to provide layered protection:
- A Zone : The perimeter of the property (e.g., fences or boundary walls)
- B Zone: The area surrounding the building (e.g., gardens, backyards, and the exterior of windows)
- C Zone: The inside of the building (e.g., living rooms, hallways, offices)
B Zone plays a critical role in early detection, as it allows for identifying intruders before they reach the building itself.

The advantage of this concept is that it enables layered monitoring of intruder movement — from the perimeter (A Zone), to approaching the building (B Zone), and finally enter (C Zone). This multi-zone approach allows for early warning and faster response.
This concept is applicable not only to residential properties but also to factories, retail stores, offices, and high-security facilities. Regardless of the size or purpose of the site, using sensors tailored to each zone enables more effective and reliable security measures.
Why is B Zone Security Important?
By installing sensors in the B Zone, it becomes possible to trigger an alarm as soon as an intruder approaches the building, allowing for earlier response timing. This concept of early warning provides an opportunity to take action before the intruder enters the building.
In contrast, if sensors are installed only inside the building, detection will occur only after the intruder has already entered.
That’s why early detection in the B-Zone is crucial — not only to deter intrusions, but also to help minimize potential damage.
Benefits of B Zone Security Measures
Installing intrusion detection sensors in the B Zone can provide the following benefits:
- Trigger alarms before intruders enter the building
Detecting intruders at an early stage allows for quicker response and intervention. - Deter intrusions through the presence of sensors
The visible presence of sensors creates a psychological barrier, making intruders hesitate to proceed. - Link with surveillance cameras for immediate visual confirmation
When a sensor is triggered, the system can automatically pop up the camera footage on the monitoring room screen, allowing security staff to quickly assess the situation. - Drive intruders away using outdoor siren
By integrating outdoor sirens, the system can create a strong deterrent effect, encouraging intruders to flee the scene. - Reduce the risk of physical damage
If the intruder retreats, damage to doors, windows, or locks can be avoided, minimizing potential losses. - Create a safer environment for families and staff
A well-implemented security system contributes to peace of mind in daily life and business operations.
Recommended Intrusion Detection Sensors for B Zone by OPTEX
For effective B Zone security, outdoor motion sensors are essential. Many OPTEX customers actively use the following models, which are well-suited for stable detection in outdoor environments:
- BXS Series
Designed for installation on building walls, this sensor monitors a wide area on both sides with a narrow detection angle. Ideal for areas such as the exterior of windows.
▶ See BXS Wired Model (BXS-ST)
▶ See BXS Wireless Model (BXS-R)

- FTN Series
A compact model that fits well in narrow spaces. Perfect for monitoring walkways or the exterior of windows.
▶ See FTN Wired Model (FTN-ST)
▶ See FTN Wireless Model (FTN-R-PT(P1))

- VXI Series
Covers a wide-angle area (90 degrees) and is suitable for various locations such as gardens, parking lots, and facility entrances.
▶ See VXI Wired Model (VXI-ST)
▶ See VXI Wireless Model (VXi-R)

These outdoor motion sensors are developed to minimize false alarms caused by small animals, car headlights, and other environmental factors, providiing reliable performance even in challenging outdoor conditions.
By selecting the right sensor for each location and purpose, you can build a more effective and dependable B Zone security system.
If you would like to learn more about B Zone security solutions, please feel free to contact OPTEX.
We will support you in selecting the most suitable sensors tailored to your specific environment and security needs.
Contact OPTEX
Please feel free to contact us for further information.
We are always eager to support you and propose a solution that suits your needs.