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Reduce nuisance alarms in high-mount outdoor detection

OPTEX has launched the TXI Series, a new range of high-mount outdoor curtain detectors designed for residential and commercial perimeter protection. Built to create an invisible curtain barrier along a building façade, the TXI Series is designed to address the challenge of balancing reliable human detection and nuisance alarm reduction in external security.

By creating a controlled detection curtain at the perimeter, the TXI Series is designed to enable earlier detection before an intruder reaches the building. Common applications include ground-floor perimeter protection, balconies, warehouses, office buildings, and retail sites, where a narrow detection field can help define and secure a property’s boundary.

In high-mount applications, detectors typically look downward to detect activity at ground level, which can make them more susceptible to nuisance alarms from pets, small wildlife, and environmental movement. In many installations, reducing sensitivity can minimise false alarms, but may also reduce detection reliability.

At the heart of the TXI is OPTEX’s patent-pending Triple AND Logic, which uses three independent sensing areas to create three detection zones, with an alarm only triggered when all three zones detect simultaneously. Working in combination with OPTEX’s Super Multidimensional Analysis (SMDA) digital processing, which analyses multiple characteristics of detected movement to help filter environmental noise and support more stable performance as conditions change, these technologies help maintain reliable human detection, while reducing nuisance alarms.

“Ensuring accurate outdoor detection at height has traditionally been a real challenge, often requiring installers to manage nuisance alarms through compromise,” says Masaya Kida, MD of OPTEX EMEA. “The TXI Series has been designed specifically to address this challenge. By combining our patent-pending Triple AND Logic and SMDA digital signal processing, we help security installers and integrators reduce nuisance alarms without compromising reliable, accurate human detection. It represents an important development in addressing a longstanding pain point for installers in high-mount outdoor detection.”

For installers, the TXI Series has been designed to support flexible set-up across different sites. The detectors offer a selectable mounting height from 2,2 m to 4 m and a 12 m x 2,4 m curtain coverage area. An optional look-down zone addresses a common vulnerability in high-mount installations and can be enabled or disabled as required. Installation is supported by included brackets for secure fitting and clean, concealed wiring, with an optional TXI-BKT ceiling/wall-mount bracket available for angle and gradient adjustment.

TXI includes multiple security and anti-sabotage features, such as a front tamper switch for cover-removal detection and a built-in accelerometer designed to detect changes in angle or position. Dual-technology models also include anti-masking functionality to provide additional protection against deliberate interference. Rated IP55 for weather resistance, and able to operate in temperatures ranging from -30°C to +60°C, the TXI Series is designed to perform reliably across a broad range of outdoor environments.

The TXI Series comprises four models to support a range of installation requirements: the TXI-ST (PIR) and TXI-DAM (dual-technology with anti-masking) in wired variants, plus the TXI-R (PIR) and TXI-RDAM (dual-technology with anti-masking) as battery-operated models. Battery models are compatible with third-party wireless transmitters, allowing integration with a preferred alarm system.

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