Potter Pressure Switch PS 120

Datasheet – Potter Pressure Switch PS 120  

Difference between PS120-1 & PS120-2

PS120-1 “One SPDT” contact  allows you to trigger one systems, example a fire panel or warning signal.

PS120-2 “Two SPDT” contacts allows you to trigger two different systems or provide redundancy. For example, one contact can alert a fire panel while the other logs data to a building management system (dual notification), connect to two separate fire panels for backup (redundancy), or activate both a warning signal and an equipment shutdown (dual action).