MMTC SAG-M Siren Operated Sensor

The MMTC SAG-M Siren Activated Gate Sensor is an emergency access device that automatically activates compatible gate and door operators when it detects an approaching emergency vehicle's siren. Operating on 12-24VAC/DC power, the sensor features an adjustable microphone sensitivity control, selectable siren detection modes, and 14 programmable relay timing settings ranging from 0.5 seconds to 2 hours. Its 6.5 x 4.125 x 2.25-inch enclosure mounts 2-4 feet above ground level and includes a 4 x 5-inch reflective identification sign. The SAG-M enables emergency vehicle entry without access cards, keys, or entry codes.

MMTC SAG-M Siren Activated Gate Sensor for Emergency Vehicle Access

The MMTC SAG-M Siren Activated Gate Sensor provides automatic emergency vehicle access through electronically operated gates and doors by detecting audible siren signals. Its integrated microphone monitors approaching emergency vehicles and activates a connected gate operator when the configured sound detection conditions are satisfied. In Yelp detection mode, the sensor recognizes the distinctive yelp siren pattern commonly used by emergency responders, helping reject unrelated environmental sounds. The device supports emergency access at gated communities, apartment complexes, commercial properties, industrial facilities, and secured parking entrances without requiring responders to carry access cards, keys, or remote transmitters.

The SAG-M operates on 12-24VAC/DC power and connects to compatible gate operators through a dedicated relay output. Its onboard YLP/YDT selector provides two detection modes: Yelp mode activates the gate when a compatible yelp siren is detected, while YDT mode responds to loud sounds lasting longer than four seconds. An adjustable sensitivity selector controls microphone response according to surrounding noise conditions and the expected approach of emergency vehicles. The sensor offers 14 preprogrammed relay timing settings ranging from 0.5 seconds to 2 hours, allowing installers to configure the duration of the gate activation signal. Integrated power/sound and output LEDs provide visual indication of detection and relay operation.

The MMTC SAG-M measures 6.5 inches high, 4.125 inches wide, and 2.25 inches deep and features a surface-mount enclosure designed for installation near automated gate entrances. The manufacturer specifies mounting the sensor 2-4 feet above ground level, away from excessive background noise, standing water, and obstructions that could interfere with siren detection. The enclosure includes mounting provisions for three screws and separate wire-routing openings for conduit or direct cable entry. Power connects to the PWR terminals, while the gate operator activation circuit connects to the SW1 output. The unit includes a 4 x 5-inch reflective identification sign that helps emergency personnel identify the siren-activated entry system.

The MMTC SAG-M supports compatible automatic swing gates, sliding gates, barrier operators, and powered door systems equipped with an appropriate external activation input. Its configurable relay timing and sensitivity settings allow integration with different gate operating sequences and site conditions. The manufacturer provides a recorded yelp siren test signal for verifying sensor operation during commissioning and maintenance. The SAG-M functions as an emergency access activation accessory rather than a complete gate controller or independent safety system; it relies on the connected operator to execute the opening command. Installation requires verification of gate operator compatibility, proper microphone placement, relay operation, and applicable fire department access requirements. Routine testing confirms that the installed system responds to the intended emergency siren signal.