CAN/ULC-S548-M90

Contains requirements for Alarm Initiating and Supervisory Detection Devices for attachment to water type extinguishing systems as follows: A) Alarm Initiating Devices, including but not limited to: (i) Vane and paddle type waterflow switches; and (ii) Pressure actuated waterflow switches; B) Supervisory Indicating Devices, including but not limited to: (i) Pressure supervisory switches; (ii) Shut-off valve position supervisory switches; (iii) Water level supervisory switches; and (iv) Temperature Supervisory Switches.