685B0001A11 - Electronic vibration switch; internal accelerometer; 0-1.5 in/sec pk; AC powered; dual Form C relays; standard enclosure; two ports with 1/2" NPT conduit hubs
685B0011A11 - Electronic vibration switch; internal accelerometer; 1-1.5 in/sec peak measurement range; 24 VDC powered; dual form C relays; Two ports with 1/2" NPT conduit hubs