STI STI-3551 Wireless Entry Alert Sensor

Overview

The STI STI-3551 is a wireless entry alert sensor designed for retrofit and new access control installations where you need door monitoring without dedicated control wiring to each entry point. Operating at 9VDC, this device combines wired power with wireless communication to integrate into existing security system topologies. Deploy it in door frame or strike installations where cable runs are constrained or where wireless coordination with other sensors improves system response time.

Compatibility

The STI-3551 integrates with access control systems supporting wireless entry sensors and 9VDC powered devices. Consult your control panel or VMS documentation to confirm wireless protocol compatibility (e.g., frequency, mesh network support). Wired 9VDC power input ensures it works alongside traditional hardwired installations in mixed environments.

Installation Notes

Requires 9VDC power supply with adequate current delivery to the sensor location. Wireless signal range depends on building construction and interference; site survey is recommended before deployment. Position the sensor to maximize line-of-sight to the access control receiver or gateway. Avoid metal strike plates and reinforced door frames that attenuate wireless signals—test signal strength during commissioning.