510: TRI-GARD Series Surface-mount Audio Glass Break Detector

The IEI 510 is a patented passive sonic glass break detector designed to detect the sound signals produced by breaking glass, including 1/8″ and ¼” plate glass and ¼” wired glass. The Tri-Gard features patented signal processing which analyzes all three dimensions of sound, these being Amplitude (loudness), Frequency (tone or pitch) and Rate of Rise in time the signals “amplitude” and/or the “Rate of Change” in time frequency. The ATL (Automatic Tracking Level) allows the Tri-Gard to self adjust to compensate for background noise and/or rising audio signals.


  • Patented three-dimensional signal processing
  • Automatic tracking level – self adjusting
  • Read range of 60 feet in hard acoustic environment
  • Indoors only
  • UL Listed


  • Alarm relay: SPDT Form C contact
  • Operating voltage: 10.5-16 VDC
  • Current draw: 66 mA maximum
  • Temperature tolerance: 14F to 120F
  • Tamper circuit: Normally closed contact 50 mA @ 24 VDC
  • Dimensions: 3″ W x 3″ H x 3/4″ D
  • Uses Model 515 tester
  • Order number: 0-510000

Installation Manual