Supervisory Switches
Function: Used to detect unauthorized operation of a main control valve in a aprinkler or standpipe system. Transmits an electrical impulse to activate audible or visual alarm.
Model 6220
For use with OS&Y gate valve from ½"/1.2cm thru 12"/30.4 cm. Red, tamper-proof cover, with J-bolt mounting. Two double-pole double-throw microswitches.
