Systemconfigurations
The3MDetectionSystemModel3900seriesconsistsoffourmodels:3901,3902,3911,and3912.Thefollowingillustrations
showtheburiedcablemountingoption.Othermountingoptionsincludedirectmountingwiththeconnectingcablesrouted
undereitheranarrowthresholdorawidebaseplate.Allmodelsfunctionidentically;theonlydifferencebetweenModels
3901and3902andModels3911and3912iscosmetic.

Models3901and3902

Models3901and3902havesolidpanelsonthelattices.Model3901hasasinglecorridor,whereasModel3902hastwo
corridors.
Fuses&voltage
selector
Keyswitch
Power
receptacle
Electronics
enclosure
Power
receptacle
Power
cord
Photocell
Alarm
Alarmlights
A
B
Fuses&voltage
selector
Photocell
Alarmlights
A
B
C
Power
cord
3900GrCorridorOverviewwithSolidPanels
Counter
Alarm

Model3901single-corridorsystem

Model3902dual-corridorsystem

Counter
Single-corridorsystemDual-corridorsystem
Copyright©2008.3M.Allrightsreserved.7