Questions about EOLRs and Series currently installed

The current panel that I'm replacing, old Radionics, has 4-wire viper vibration sensors home run from all the windows, plungers & vipers in series from the doors and motions.
 
The seem to be no EOLRs installed at the windows and doors, they are installed in the panel. Any series of sensors are also wired from the panel home runs. It looks like all windows on each floor are a zone, each door is a zone and there is a CO zone. The door zones are each a vibration sensor and plunger in a series.
 
Assuming the vibration sensors haven't been turned on in years and they are older than that, should I replace them or test and use them? If I don't have to replace them, no need to be wasteful. But, if it's time, it's time
 
If I keep the existing sensors, can I wire contacts in series?
 
If I don't keep them, can I wire other glass break / vibration sensors with contacts in a series? What's the ideal combo? I'd like to use the existing 4 wires if possible.
 
At any rate, should I put EOLRs at the windows & doors? If yes, any resources about the best way to handle it?
 
I have Vista 20P panel, no zone expander as of yet but can get one if necessary. Any sensor recommendations would be great. While we're on the subject, I need to replace the CO sensors as well. The plugin units are falling out of the sockets and driving us crazy. So, recommendations for that and a few 2/4 wire smokes would be helpful.
 
Thanks yet again!
Brett
 

Abandon the shocks.
 
Unless you plan on pulling out all the contacts and putting a single device per zone, the returns on EOLR supervision diminish. For fire or CO it's a different story.
 
Any vibration can have a contact in series, however I would strongly suggest against this....powered devices should have their own zone separate from nonpowered contacts for the simple fact of troubleshooting a false alarm issue. Other contacts can be combined as you see fit, but common sense should dictate. Doors on their own, windows by room and anything that may have a similar zone type can be combined, but again, in the case of a false, the more devices per zone, the more things that can be causing it and harder to track down.
 
I'd strongly suggest zone expanders, but without knowing the extent of the present system, a number can't be suggested. I would not, however, use the "zone doubling" feature....too many things to go wrong.

Ok, so I'll ditch the current sensors. That leaves me 4 wires at each window to utilize without having to patch drywall.
 
Are shock sensors needed on windows or contacts enough? I was planning on having ASC-SS1 paired with the 943wg but now I'm thinking that is overkill. Doors might be a different story.  Is there any difference in sensors for 2nd floor windows vs 1st floor/basement? Or, roof accessible windows vs others etc? 
 
I just ordered two 4219 expanders and have 17 zones planned. That's with each rooms windows being one zone.

Piezo based shocks have a specific size and type glass they protect, in addition to issues with movable panes.
 
I'd install an acoustic glassbreak for adequate coverage and call it a day. Unless you have heavy drapes and/or shutters, it's the way to go.
 
Perimeter openings should have contacts.

What about these glass breaks? http://www.smarthome.com/united-security-products-724-window-bug-glass-break-detector.html
 
Also, the doors have some old roller plungers. Are plungers preferred or do recessed magnetic contacts work here as well?
 
I'm now looking at these for my windows since the old vibration sensors are mounted in the tracks. http://www.smarthome.com/united-security-products-a1-d-twist-loc-arrowhead-magnetic-contact.html
 
It's funny, my basement vibration sensors are mounted on the metal window frame that's attached to the concrete wall. I'm going to do some testing but I have doubts that I'd be able to trip it.

No.
 
Get away from on the glass units.
 
For plungers, if they have any visible contacts (brass) then get rid of those and either install recessed magnetic contacts or reed based plunger/roller contacts as the application dictates.
 
For the contacts, I would not get those USP's. Vinyl window, sure, but anything else, get press fit.