"you may not be able to isolate that sensor only"
Why not?
"you will have to omit the whole zone,eg zone 1 downstairs ,zone 2 upstairs etc .find out which zone its on and omit that zone"
You really don't know how alarms work do you?
"try slipping some aluminum foil between the contacs"
You've been watching too many American Cop progs.
acorn
October 2011