Topic: Help needed re: Co Line relay application

[MnDave]

Is there a relay of some kind that I can incorporate with an alarm system to indicate when a CO Line is removed from an RJ31X return side?

I've looked at Wizard's Toolbox on Sandman's site. I don't know if I need high sensitivity, latching or some combination. It can't interfere with the line's normal use and its state must be unchanged during Ringing, On/Off Hook & Loop Disconnect. It would be "on" during those states and "off" when the live line is removed.

The application is to always show when the primary or secondary line is in-use by an alarm system. Not just when an alarm is triggered. My alarm feature (Vertical SBX) is not what this customer wants. His alarm only trips on an alarm condition. It does not trip during a dialing test. I hope to utilize a ringing generator and simulate an incoming call via some spare CO ports to give him a system wide visual indicator. I would obviously use secondary relays.

This is a busing company that has had past issues with alarms grabbing lines during normal business hours.

[telemarv]

Something like this
http://www.silentknight.com/pdffiles/Commpdf/7150spec.pdf

[MnDave]

Thanks Marv, That is exactly what I am looking for! I see that it waits 40-60 seconds to prevent false alarms and now that I know to call it either a cut line indicator or line fault indicator, I was able to search and find a couple of other manufacturers too. Some have sensors even as short as 17 seconds.

[silversam]

Nice looking product, Marv. Looks like it fits the bill perfectly.

Sam

[TexasTechnician]

It sounds like they need to get a dedicated line or lines. If this is a fire alarm they definetly should!
How many lines are you talking about and how many times is the problem occuring in a 24 hour period on each line?

[MnDave]

Your questions would be quite applicable in our metro area but this is a small town in a rural area and county regulations vary. Since the alarm company hasn't insisted on a dedicated line, I've decided its not my fight.  There are only two lines, the primary and secondary. How often an issue occurs wasn't spelled out. I was only commissioned to provide what the customer wants and will only be obligated for equipment on the down side of the RJ31X.

[TexasTechnician]

I know how the rules change from area to area and I've always hated it.
I understand what your objective is in this case. 

Just for future knowledge, generally speaking there should be one test call to the monitoring center in a 24 hour period from the fire alarm. I have never seen a system programmed to transmitt more than one "Timer Test" per day in all the years I've worked on fire alarms. Why? Because that's what the rule is in most places and if you transmitt more the monitoring center is going to increase the fee for the additional calls into their equipment. 

With the above in mind I think there are problems in the fire alarm and they have decided to live with them rather than pay for the repair of the system.
In this economy I'm sure they're not the only one's!