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The SAFETY TECHNOLOGY INT'L INC STI-9621 is a wire cage cover designed to protect passive infrared (PIR) motion sensors from physical damage, tampering, and vandalism. Built for commercial and industrial environments where sensor exposure is a concern, this cage mounts over an existing PIR detector to shield it without blocking its detection field. The unit measures 5.8 inches wide by 7 inches tall, making it a fit for standard PIR sensor housings. It is typically installed by security or low-voltage electricians as part of a sensor protection strategy in high-traffic or high-risk areas.
The STI-9621 is suited for use in commercial buildings, warehouses, schools, and institutional facilities where PIR sensors are subject to accidental impact or intentional tampering. It fits over installed motion detectors on wall or corner mounts and is intended for indoor applications. The open wire cage construction allows infrared signals to pass through while providing a physical barrier around the sensor body. Security integrators and low-voltage contractors are the primary installers of this product.
Designed as an OEM-style protective cover for standard-size passive infrared motion sensors used in commercial and residential security systems.
Installation is typically performed by a licensed low-voltage electrician or security system technician. Before installing the cage, power down the sensor and alarm panel circuit per the system manufacturer instructions. Secure the cage firmly to the mounting surface to prevent removal by unauthorized personnel. Verify that the cage does not obstruct the sensor lens angle or detection coverage zone after installation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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