Hey y’all I have these old intrusion detection units from 1984 inside my house. These are the AS-6000-SL made by a company called Blue Grass Electronics. These are very rare, I tried to find a picture of one on the internet and couldn’t find any on the internet. Blue Grass Electronics, the company that made these, was rather small. The intrusion detection units themselves have most likely been scrapped. That makes these super rare. Anyone familiar with these? I will have pictures linked below.
1 Like
never heard of it… Looks pretty rare
Yeah I’ve never heard of that company or seen those kinds of sensors myself. Wouldn’t surprise me if they’re acoustic glassbreak detectors going by their design however.
I have one more picture of the back of these. It says “BGE audio switch” at the top but it also says “intrusion detection unit” at the bottom with a typo somehow.
From what I read just now, “BGE audio switch” essentially means “glassbreak detector” (though the “BGE” part is specifically the manufacturer’s name in abbreviated form), so that is indeed what it is.
That term is used by UL to encompass anything (save for a camera) that can detect intrusion by electronic means, including:
- Glassbreak detectors (like yours)
- Seismic/vibration detectors (used for safe and vault work)
- Photobeam intrusion detectors (often used outside)
- Laser scanner intrusion detectors (used in high-security work)
- and motion detectors (such as PIRs & dual-techs)
Interesting, thanks for the info
These are indeed glassbreak detectors, I read a bit about how “listen-in” features work and learned that the detectors constantly listen for certain sounds like glass breakage, with its built-in microphone. If the device detects a sound like this, it will send the panel into alarm. The AS-6000-SL has this feature, I could tell since the “L” in “AS-6000-SL” most likely means “listen” and some of the wires are for the listen-in function.
Yeah, that’s how most acoustic glassbreak detectors work last I checked. Back in the day a lot of systems had aluminum window foil instead, which relied on the foil forming a circuit that would hopefully be broken if the window was smashed.
r/Engrish lamo.
That’s pretty cool tho
Yeah I have seen videos like the one from @NewAgeServerAlarm on YouTube titled “1970’s Burglar Alarm System” that showed the aluminum foil attached to the glass. It’s a great demonstration of how it worked in the 70s. Also an example of an advanced system from the 70s would be the @ExitSign250 video in that huge house where he said “dictograph heat detector” like 15 times. One of the devices was broken but was fixed later on.
My doctors office has some of those glass break detectors on the second floor 
.
Keypad visible in photo above looks to be napco
1 Like
I guess I might NOT be the only person that has seen these. Lmao.
1 Like
Lmao. I found one on ebay
Looks like it may have been painted over though. The wood grain border appears to be gone, same goes for the “ALARM” text which was indeed painted. Oh no.
I’m still beyond shocked that you found those, they are extremely rare. There was basically no documentation of these prior to my first post.
1 Like
Nice!
Where did that come from? You sure you’re on the right topic?
Ooohhhhh… that one’s gotta hurt.
Okay, I gotta clarify some stuff here. Yeah I’m sure, what I was saying was that before I posted for the very first time on here about a month or two ago, I couldn’t find much info about these things on the web, no manuals, no ads, couldn’t really find much info on the company Blue Grass Electronics (except for that it more than likely was a quite small business that didn’t make as many things as a company like DSC or Honeywell) or what else Blue Grass Electronics made, however I recently found that there’s more than 4 versions of this particular unit, and some I believe are earlier versions from the early 80s or heck maybe very late 70s, I ended up finding an eBay listing for a slightly older version like this, find it here. And there’s an even earlier version of that one, and this I think would be the AS-1100-RM, which I’m assuming is the first generation (would be the 1000 series, maybe from the late 70s, but I still don’t know if that’s true because there’s no documentation on those at all). I’ll link a picture from another eBay listing. These still remain very rare for now, because not only was the company small and rather unheard of, but most of these glassbreak detectors have likely been scrapped. Sorry about that.
Source: Pardon Our Interruption...
Oh, uh, okay I guess. I was mainly referring to that photo of a First Alert 9120B that you used in that particular reply though, which doesn’t fit this topic at all.