The signature series 550/552LS Tri-Gards are the first audio glassbreak detectors with microprocessor-based, multiple signature analysis. Both units are self-adjusting, and feature Automatic Gain Control circuits to filter the amplitude of ambient sound and process all sound at the same volume. This eliminates the need for manual sensitivity adjustments and gives the 550/552LS maximum detection accuracy even in muffeled (ie.curtains, shades, blinds, small glass sizes) and changing environments.
Enabling the signature supervision features allows the unit to monitor the sound input to the microphone and the associated circuitry (except the relay) of the 550LS to insure the detector continues to hear across the full frequency spectrum from 10 to 10,000 cycles. If after 120 hours, the 550LS has not heard the individual frequency elements associated with glassbreak, an amber LED will latch to indicate a potential trouble situation.
Each unit is factory set for use in most residential applications. For laminated glass (ie. most commercial and industrial applications) the environmental switch is enabled, thereby tailoring the units response to the more demanding environment.